Brakes - Repair - e92/e93 BMW M3 E90

34 00 ... Checking brake discs

Special tools required

1. 34 1 280

See BRAKES - SPECIAL TOOLS .

Necessary preliminary tasks

1. Remove wheels

Checking thickness difference

1. Measure thickness difference within brake surfaces at 8 point (spread over the circumference) with a micrometer gauge
2. Compare measurement result with setpoint value . See «BRAKES - TECHNICAL DATA»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) .

Scheme 1

Check minimum brake disc thickness

1. Position special tool 34 1 280 at three measuring points in measuring area (1) and measure
2. Compare measurement result and lowest value with setpoint value . See «BRAKES - TECHNICAL DATA»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) .

Scheme 2

34 00 ... General Information

The brake system is one of the most important safety systems on any motor vehicle. It is therefore essential to act with utmost care when working on the brake system and to follow the instructions below.

General

1. Ensure cleanliness and only use rags which do not lose lint.
2. Wash away or vacuum up brake dust, do not clear it away using compressed air. This dust is a health hazard.
3. Do not under any circumstances allow any oil or grease to get into the brake system. This would result in a complete malfunction of the brake system.
4. When cleaning brake components with brake cleaner do not allow brake cleaner to get into in the brake system.
5. Even the most minute traces of brake cleaner must be avoided.

Brake fluid

1. Replace brake fluid at least every two years.
2. Never reuse drained brake fluid.
3. Always use BMW-approved brake fluid, refer to «BRAKES - OPERATING FLUIDS»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-operating-fluids) .
4. Dispose of brake fluid in approved appliances only.
5. Do not allow brake fluid to drain into drain pipes, into the outside environment or into unsuitable facilities. This would create the risk of groundwater contamination since brake fluid is classed as a fluid that is hazardous to water.
6. Do not allow brake fluid to come into contact with paintwork as this will destroy the paint.
7. Brake fluid must not be allowed to remain on bare skin too long in order to avoid skin problems. Wash skin coated with brake fluid with water and soap.
8. If brake fluid makes contact with eyes, immediately flush with large quantity of clean water and visit eye doctor.

Wheel brakes

1. Brake pads: Brake pads must be replaced when the warning threshold of the brake pad wear indicator is reached. See «FRONT BRAKES»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) or «REAR BRAKES»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) . Brake pads must always be replaced on both sides of any axle. The friction surfaces of the brake pads must not come into contact with oil or grease. The brake pads must be replaced if they are fouled by such substances. In the case of rotation-dependent brake pads, make sure the arrow marking points in the direction of rotation of the brake disk for when the vehicle is moving forward. Brake pads with left/right markings must be fitted on the relevant side of the vehicle. One-sided angled areas on the brake pads must be located on the disk contact side of the brake caliper for when the vehicle is moving forward.
2. Brake discs: Brake disks must not be scored or cracked. Furthermore, minimum brake disk thickness , disk runout, parallelism and surface roughness of the friction surfaces must not exceed or drop below the permitted values. See «FRONT BRAKES»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) or «REAR BRAKES»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) . Always strip preservative off new parts before installation. With the rear brake discs, also strip preservative off brake drum on parking brake.
3. Always strip preservative off new parts before installation.
4. Brake calipers: Only approved pastes on the basis of glycol must be used for repairs on brake calipers. All moving parts on the brake caliper must move freely: note grease specifications. Use only BMW-approved lubricants to grease caliper guides (refer to «BRAKES - OPERATING FLUIDS»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-operating-fluids) ).

Brake lines, brake hoses

1. Brake lines and brake hoses must be correctly routed and must not abut with body or components in a way which would cause chafing.
2. To prevent damage, release and tighten brake line couplings with a special brake line wrench only.
3. The system must be bled each time any brake lines have been detached.
4. All connection points must be checked for leaks.
5. Only tighten down brake hoses on the front axle when wheels are in straight-ahead position.
6. Close off open connections of brake lines and individual components to prevent dirt from getting into the brake system.
7. When tightening down brake line couplings, observe tightening torque 34 32 1AZ . See «34 32 BRAKE LINES»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-tightening-torques-e92e93__34-32-brake-lines) .

Wheel-slip control system

The wheel-slip control system is essentially maintenance-free; however the following must be observed

1. When carrying out welding work with electric welding equipment, be sure to disconnect the plug from the electronic control unit (ignition turned off).
2. During painting work, the control unit may be subjected for brief periods to loads of max. 95°C and for long periods (approx. 2 hours) to loads of max. 85°C.
3. Terminals must be completely tight on end poles of battery.
4. Brake lines on hydraulic unit must not be swapped over: if applicable, mark them prior to disassembly. On completion of repair work, carry out swap-over test with the DIS diagnosis system.

34 00 ... General information on braking in new brake discs / brake pads

34 00 009 Checking brakes on test stand

Necessary preliminary tasks

1. Check tires for damage
2. Check tire treads
3. Check tire pressure

The brakes must be at normal operating temperature. To do so, gently warm up the brake disks and brake drums while dry by braking the vehicle several times.

Scheme 3

34 00 010 Checking thickness of brake pad

Special tools required

1. 34 1 260

See BRAKES - SPECIAL TOOLS .

Note. The thickness of the outer brake pads can be determined without removing the wheels. If necessary, move car until opening for brake pad wear indicator (brake pad) can be seen through rim styling.

Insert special tool 34 1 260 through rim into opening for brake pad wear indicator.

Press special tool onto brake pad. Slide ring (1) in direction of arrow up to stop and read off measured value.

Note. Brake disk Brake pad with backplate See FRONT BRAKES or REAR BRAKES .

Scheme 4

34 00 012 Parking brake function check

Note. If deviations are identified during the following check, the parking brake must be adjusted

Drive vehicle onto chassis dynamometer.

Warm up brakes.

Check handbrake.

0th tooth (handbrake released): Vehicles with manual transmission: Shift lever in neutral position.

Vehicles with automatic transmission: Selector lever in "N" position.

1. Without locking differential < or = 150 N.
2. With locking differential < or = 200 N (possibly odd display).

1st tooth: No increase in braking force with regard to 0th tooth. Indicator lamp can be lit.

2nd tooth: Indicator lamp must be lit.

3rd tooth: Increase in braking force.

5th tooth: The brake force display must have reached > or = 400 N.

Checking brake force differential at wheel

Apply handbrake until a wheel circumferential force (measured on brake test stand) of min. 1000 N is reached.

Max. permitted brake force differential right/left < or = 35 % (referred to greater brake value).

It must be possible to brake with locked wheels with the handbrake.

34 00 025 Replacing fluid in ABS/ASC+T brake system

Note. Read and comply with General Information .

Unclip retaining tabs (1).

Pull cover (3) out of guide (2) and remove.

Scheme 5

Connect brake fluid changer to expansion tank and switch on.

Note. Check relevant Operating Instructions for each device. Charging pressure should not exceed 2 bar.

Scheme 6

Flushing brake system completely

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Open bleeder valve and purge until clear, bubble-free brake fluid emerges.

Close bleed valve.

Follow same procedure on rear left, front right and front left wheel brake.

Scheme 7

Note. The clutch slave cylinder must also be scavenged in vehicles with manual transmissions.

Switch off brake fluid changer and remove from expansion tank.

Check brake fluid level. If necessary, top up/draw off to max. level.

Close expansion tank.

Note. Pay attention to rubber seal (1) in sealing cap.

Scheme 8

After installation

1. Reset CBS display according to factory specification

34 00 050 Bleeding brake system with DSC

Note. Read and comply with General Information . When replacing or repairing, observe the filling and bleeding instructions for the following parts: Tandem brake master cylinder Hydraulic unit Components and connecting lines which are fitted between these assemblies. Connect bleeder unit with max. 2 bar filling pressure. A second person is needed to help carry out this work.

Unclip retaining tabs (1).

Pull cover (3) out of guide (2) and remove.

Connect DIS.

Select path: Service functions - Chassis/Suspension - Slip control systems - Bleeding procedure.

Connect brake fluid changer to expansion tank and switch on.

Flushing brake system completely

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Open bleeder valve and purge until clear, bubble-free brake fluid emerges.

Close bleed valve.

Follow same procedure on rear left, front right and front left wheel brake.

Bleeding rear-axle brake circuit

Connect bleeder hose with collecting tray to bleeder valve on rear right brake caliper.

Close bleeder valve.

Run bleeding routine with DIS with bleeder valve open.

After completing routine, press brake pedal 5 times to floor; clear and bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at rear left.

Bleeding front-axle brake circuit

Connect bleeder hose with collecting tray to bleeder valve on front right brake caliper.

Close bleeder valve.

Run bleeding routine with DIS with bleeder valve open.

After completing routine, press brake pedal 5 times to floor, clear and bubble-free brake fluid must flow out.

Close bleed valve.

Repeat procedure at front left.

Scheme 9

Switch off brake fluid changer and remove from expansion tank.

Check brake fluid level.

Close expansion tank.

Note. Pay attention to rubber seal (1) in sealing cap.

34 00 513 Checking parking brake setting (vehicle check for service)

Note. If deviations are identified during the following check, the parking brake must be adjusted

0th tooth (handbrake released): Vehicles with manual transmission: Shift lever in neutral position.

Vehicles with automatic transmission: Selector lever in "N" position.

1. Without locking differential < or = 150 N.
2. With locking differential < or = 200 N (possibly odd display).

1st tooth: No increase in braking force with regard to 0th tooth. Indicator lamp can be lit.

2nd tooth: Indicator lamp must be lit.

3rd tooth: Increase in braking force.

5th tooth: The brake force display must have reached > or = 400 N.

Checking brake force differential at wheel

Apply handbrake until a wheel circumferential force (measured on brake test stand) of min. 1000 N is reached.

Max. permitted brake force differential right/left < or = 35 % (referred to greater brake value).

It must be possible to brake with locked wheels with the handbrake.

Scheme 10

34 11 000 Removing and installing/replacing brake pads on both front disc brakes (M3)

Special tools required

1. 34 1 080
2. 34 1 280
3. 34 6 320

See BRAKES - SPECIAL TOOLS .

1. Due to the increased strain on the brake discs, we recommend that you also replace the «brake discs»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-11-220-removing-and-installing) when fitting this brake pad
2. It is absolutely essential to replace the «brake discs»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-11-220-removing-and-installing) if cracked > or = 13 mm even before the brake pad is worn

Necessary preliminary tasks

1. Remove wheels .
2. Remove «brake pad wear sensor»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-35-001-replacing-a-brake)

Lever out retaining spring (1) in direction of arrow towards rear.

Installation

Attach retaining spring (1) first at top and bottom and then allow retaining lug (2) to engage in recess of brake caliper housing.

Scheme 11

Remove plastic plugs (1).

Scheme 12

Left

Pull brake pad wear sensor (1) towards rear out of pad.

Release guide screws (2) with special tool 34 1 080 . Withdraw brake caliper backwards.

Installation

Only clean guide screws; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 11 4AZ . See 34 11 FRONT BRAKE .

Scheme 13

Press back brake pads and piston with special tool 34 6 320 .

Scheme 14

Press brake pads inwards and remove.

The two brake pads are seated with a spring in the piston or in the brake caliper housing and must not be mixed up.

In the event of one-sided brake pad wear, do not change brake pads round.

Observe minimum thickness of brake linings . See BRAKES - TECHNICAL DATA .

Clean brake pads.

Do not apply grease to brake pad backplate.

Scheme 15

Check minimum brake disc thickness

1. Position special tool 34 1 280 at three measuring points in area (1) and measure.
2. Compare measurement result and lowest value with setpoint value . See «BRAKES - TECHNICAL DATA»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) .

Note. The minimum brake disc thickness is configured in such a way that it lasts the life of a further set of brake pads (does not apply to M vehicles and perforated brake discs).

Check dust sleeve (1) for damage and replace if necessary. Clean contact surface (2) of brake piston with brake cleaner and apply a thin coating of brake pad paste .

Scheme 16

Clean contact surfaces (1) and (2) of brake pad tee heads/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste .

Note. Grease contact surfaces on brake caliper at top and bottom.

Scheme 17

Scheme 18

Brake pad with adhesive film must be installed in each case on the outside in direction of travel!

Detach protective film (1) from brake pad and install pad.

Scheme 19

So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper holder. Instead, clean with brake cleaner and apply a thin coating of Never Seez Compound brake pad paste.

Scheme 20

So as not to damage the surface coating, if possible do not mechanically clean pad guides (1). Instead, clean with brake cleaner and apply a thin coating of Never Seez Compound brake pad paste.

Scheme 21

Note. After completing work: Fully depress brake pedal several times so that brake pads contact brake discs. When installing new brake pads at front and rear axles, brake fluid level must be brought up to "MAX" marking. Read and comply with notes on braking in new brake discs / brake pads . If necessary, when replacing pads, reset CBS display in accordance with factory specification.

34 11 020 Removing and installing or replacing front left or right brake caliper (Teves)

Necessary preliminary tasks

1. Remove wheels .
2. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .

After completing work: Bleed braking system

Press clutch pedal down to floor and secure with pedal support.

Note. The pedal support may only be released when the brake lines are reconnected. This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

Scheme 22

If necessary, pull brake hose out of holder (1).

Disconnect brake hose from brake line (2).

Installation

Tightening torque See 34 32 BRAKE LINES .

Detach brake hose from brake caliper (4).

Scheme 23

Installation

Tightening torque 34 32 2AZ . See 34 32 BRAKE LINES .

Note. First tighten brake hose on brake caliper. Move wheels into straight-ahead position. Insert brake hose in bracket and screw onto brake pipe.

Unscrew guide bolts (1).

Remove brake caliper by pulling upwards.

Installation

Clean guide screws only; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 11 4AZ . See 34 11 FRONT BRAKE .

Scheme 24

34 11 220 Removing and installing or replacing both front brake discs

Special tools required

1. 34 1 280

See BRAKES - SPECIAL TOOLS .

Necessary preliminary tasks

1. Remove front wheels
2. Remove and clean «brake pads»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-11-000-removing-and-installingreplacing)

Note. After completing work, read and comply with notes on braking in new brake discs / brake pads .

Check minimum brake disc thickness

1. Position special tool 34 1 280 at three measuring points in area (1) and measure.
2. Compare measurement result and lowest value with setpoint value . See «BRAKES - TECHNICAL DATA»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) .

Installation

New brake pads may only be fitted if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH). See BRAKES - TECHNICAL DATA .

If the brake discs are replaced, you must also fit new brake pads.

Brake discs may only be replaced in pairs (on each axle).

Release screws (1) and remove brake carrier (2).

Installation

Tightening torque 34 11 2AZ . See 34 11 FRONT BRAKE .

Scheme 25

Release screws (1) and remove brake disc.

Installation

Brake disc must be correctly seated on guide pins (2).

Replace screw.

Tightening torque 34 11 1AZ . See 34 11 FRONT BRAKE .

Scheme 26

34 11 250 Removing and installing / replacing a brake carrier / brake guard plate at front

Necessary preliminary tasks

1. Remove front «brake disks»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-11-220-removing-and-installing) .

Release screws (1) and remove brake guard plate (2).

Installation

Tightening torque 34 11 3AZ . See 34 11 FRONT BRAKE .

Scheme 27

34 11 519 Removing and installing/replacing left or right front brake caliper

Necessary preliminary tasks

1. Remove wheels .
2. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .
3. If necessary, replace «brake pad sensor»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-35-001-replacing-a-brake)

After completing work: Bleed braking system

Press clutch pedal down to floor and secure with pedal support.

Note. The pedal support may only be released when the brake lines are reconnected. This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

If necessary, pull brake hose out of holder (1).

Disconnect brake hose from brake line (2).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Detach brake hose from brake caliper (4).

Installation

Tightening torque 34 32 2AZ . See 34 32 BRAKE LINES .

Note. First tighten brake hose on brake caliper. Move wheels into straight-ahead position. Insert brake hose in bracket and screw onto brake pipe.

Unscrew guide bolts (1).

Remove brake caliper by pulling upwards.

Installation

Clean guide screws only; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 11 4AZ . See 34 11 FRONT BRAKE .

Scheme 28

34 11 552 Overhauling left or right front brake caliper (brake caliper removed)

Special tools required

1. 00 9 316

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS -- 128I .

Check guide sleeves (5), fitting repair-kit guide sleeve if necessary.

Scheme 29

Carefully force piston out through connection bore with compressed air.

To protect piston, place a protective plate (e.g. hard wood or hard felt) in caliper recess.

Do not grip piston with fingers - risk of trapping!

Scheme 30

Press off dust sleeve (1).

Scheme 31

Carefully remove seal (1) with special tool 00 9 316 .

Clean cylinder bores and parts with alcohol and dry with compressed air.

Thoroughly inspect cylinder bore, piston and flange surfaces.

Machining of cylinders and pistons is not permitted.

Install new seal.

Installation

Apply a light coat of Ate brake cylinder paste to cylinder bore, piston and seal

Refer to BRAKES - OPERATING FLUIDS .

Scheme 32

Fit dust sleeve (1) in annular groove of piston (2).

Press piston into cylinder bore.

Evenly press dust sleeve (1) onto brake caliper housing as far as it will go.

Installation

The area between the dust sleeve and the brake caliper housing must be kept dry. It must not come into contact with Ate brake cylinder paste or brake fluid so as to ensure that the dust sleeve is perfectly seated.

Scheme 33

34 21 812 Overhauling left or right rear brake caliper (brake caliper removed)

Special tools required

1. 00 9 316

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS -- 128I .

Note. Use repair kit

Check guide sleeves (5), fitting repair-kit guide sleeve if necessary.

Carefully force piston out through connection bore with compressed air.

To protect piston, place a protective plate (e.g. hard wood or hard felt) in caliper recess.

Do not grip piston with fingers - risk of trapping!

Press off dust sleeve (1).

Carefully remove seal (1) with special tool 00 9 316 .

Clean cylinder bores and parts with alcohol and dry with compressed air.

Thoroughly inspect cylinder bore, piston and flange surfaces.

Machining of cylinders and pistons is not permitted.

Install new seal.

Installation

Apply a light coat of Ate brake cylinder paste to cylinder bore, piston and seal

Refer to BRAKES - OPERATING FLUIDS .

Fit dust sleeve (1) in annular groove of piston (2).

Press piston into cylinder bore.

Evenly press dust sleeve (1) onto brake caliper housing as far as it will go.

Installation

The area between the dust sleeve and the brake caliper housing must be kept dry. It must not come into contact with Ate brake cylinder paste or brake fluid so as to ensure that the dust sleeve is perfectly seated.

Scheme 34

34 21 173 Replacing rear left (or right) brake carrier

Necessary preliminary tasks

1. Remove «expander lock»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-41-250-removing-and-installingreplacing)
2. Remove wheel hub

Release screws (1).

Installation

Tightening torque 34 21 3AZ . See 34 21 REAR BRAKE .

Release screws (2) and remove brake carrier (3).

Installation

Tightening torque 34 21 3AZ . See 34 21 REAR BRAKE .

Scheme 35

34 21 200 Removing and installing or replacing brake pads on both rear disc brakes (Teves floating caliper)

Special tools required

1. 34 1 050
2. 34 1 280

See BRAKES - SPECIAL TOOLS .

Necessary preliminary tasks

1. Remove wheels
2. Remove «brake pad wear sensor»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-35-001-replacing-a-brake)

Lift out retaining spring (1).

Scheme 36

Remove cover plug (1).

Scheme 37

Unscrew guide bolts (1).

Remove brake caliper (2) by pulling forward.

Installation

Tightening torque 34 21 4AZ . See 34 21 REAR BRAKE .

Clean guide screws only; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Scheme 38

Remove outer brake pad.

Inner brake pad is located with its spring in the piston.

Clean brake pads.

Do not grease backs of brake pads sleeve.

Scheme 39

Turn piston fully back with special tool 34 1 050 .

Scheme 40

Check minimum brake disc thickness

1. Position special tool 34 1 280 at three measuring points in area (1) and measure.
2. Compare measurement result and lowest value with setpoint value . See «BRAKES - TECHNICAL DATA»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) .

Note. The minimum brake disc thickness is configured in such a way that it lasts the life of a further set of brake pads (does not apply to M vehicles and perforated brake discs).

Check dust sleeve (1) for damage and replace if necessary.

Clean contact surface (2) of brake piston with brake cleaner and apply a thin coating of brake pad paste .

Clean contact surfaces (1) of brake pad tee heads/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste .

Scheme 41

Clean contact surface (1) of brake caliper with brake cleaner and apply a thin coating of brake pad paste .

Scheme 42

So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (1) for the brake pads on the brake caliper holder. Instead, clean with brake cleaner and apply a thin coating of Never Seez Compound brake pad paste.

Scheme 43

Note. After completing work: Fully depress brake pedal several times so that brake pads contact brake discs. When installing new brake pads at front and rear axles, brake fluid level must be brought up to "MAX" marking. Read and comply with notes on braking in new brake discs / brake pads . When replacing pads, reset CBS display in accordance with factory specification.

34 21 320 Removing and installing or replacing both rear brake discs

Special tools required

1. 34 1 280

See BRAKES - SPECIAL TOOLS .

Necessary preliminary tasks

1. Remove wheels
2. Remove and clean «brake pads»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-21-200-removing-and-installing)

After completing work

1. Adjust «parking brake»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-10-014-adjusting-handbrake)
2. Read and comply with notes on «braking in new brake discs / brake pads»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information-on) .

Check minimum brake disc thickness

1. Position special tool 34 1 280 at three measuring points in area (1) and measure.
2. Compare measurement result and lowest value with setpoint value . See «BRAKES - TECHNICAL DATA»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-technical-data-e92e93) .

New brake pads may only be fitted if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH). See BRAKES - TECHNICAL DATA .

If the brake discs are replaced, you must also fit new brake pads.

Always replace brake discs in pairs.

Release bolts (1) and detach brake anchor plate.

Installation

Tightening torque 34 21 2AZ . See 34 21 REAR BRAKE .

Scheme 44

Release screws (1) and remove brake disc.

Installation

Replace screw.

Tightening torque 34 21 1AZ . See 34 21 REAR BRAKE .

Scheme 45

34 21 745 Removing and installing or replacing rear left or right brake caliper (Teves)

Necessary preliminary tasks

1. Remove wheel
2. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .

After completing work: Bleed brake system .

Press clutch pedal down to floor and secure with pedal support.

Note. The pedal support may only be released when the brake lines are reconnected. This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

Disconnect brake hose from brake line (1).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Detach brake hose from brake caliper (3).

Installation

Tightening torque 34 32 3AZ .

Scheme 46

Note. First tighten brake hose on brake caliper. Insert brake hose in bracket and screw onto brake pipe.

Lift out retaining spring (1).

Remove cover plug (1).

Pull brake pad wear sensor out of brake pad (right side only).

If necessary, replace brake pad wear sensor.

Unscrew guide bolts (1).

Remove brake caliper (2) by pulling forward.

Installation

Tightening torque 34 21 4AZ . See 34 21 REAR BRAKE .

Clean guide screws only; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Scheme 47

Remove outer brake pad.

Inner brake pad is located with its spring in the piston.

Clean brake pads.

Do not grease backs of brake pads sleeve.

Special tools required

1. 00 9 316

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS -- 128I .

Note. Use repair kit, refer to .

Check guide sleeves (5), fitting repair-kit guide sleeve if necessary.

Carefully force piston out through connection bore with compressed air.

To protect piston, place a protective plate (e.g. hard wood or hard felt) in caliper recess.

Do not grip piston with fingers - risk of trapping!

Press off dust sleeve (1).

Carefully remove seal (1) with special tool 00 9 316 .

Clean cylinder bores and parts with alcohol and dry with compressed air.

Thoroughly inspect cylinder bore, piston and flange surfaces.

Machining of cylinders and pistons is not permitted.

Install new seal.

Installation

Apply a light coat of Ate brake cylinder paste to cylinder bore, piston and seal

Refer to BRAKES - OPERATING FLUIDS .

Fit dust sleeve (1) in annular groove of piston (2).

Press piston into cylinder bore.

Evenly press dust sleeve (1) onto brake caliper housing as far as it will go.

Installation

The area between the dust sleeve and the brake caliper housing must be kept dry. It must not come into contact with Ate brake cylinder paste or brake fluid so as to ensure that the dust sleeve is perfectly seated.

Scheme 48

34 31 181 Removing and installing / replacing expansion tank for hydraulic brake actuation

Necessary preliminary tasks

1. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .
2. Remove lower section of microfilter housing

Note. Extract brake fluid out of expansion tank. Use a suction bottle used exclusively for drawing off brake fluid. Do not reuse drawn out brake fluid.

Pull off supply hose (1) of clutch hydraulic system if necessary.

Unfasten plug connection (2) and disconnect.

Unlock quick-release fastener (3) and disconnect vacuum line.

Feed brake line out of rubber grommet and remove cover (4).

Scheme 49

Unclip locking pin (1) from retaining lugs (2) and pull out locking pin.

Pull expansion tank in direction of arrow vertically out of brake master cylinder.

Scheme 50

Scheme 51

After installation

1. «Bleed braking system»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-050-bleeding-brake-system)

34 31 505 Removing and installing/replacing master brake cylinder for DSC

Special tools required

1. 32 1 270

See STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS

Necessary preliminary tasks

1. Remove expansion tank .
2. Remove footwell trim .
3. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .

Remove locking clip (1) and disengage and pull out locking pin.

Slacken nuts (2).

Installation

Replace self-locking nuts.

Tightening torque 35 11 1AZ .

Scheme 52

Unfasten brake lines (1).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Close off brake lines and brake master cylinder with plugs 32 1 270 .

If necessary, detach line (3) from hydraulic unit and press downwards slightly.

Scheme 53

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Release nuts (2) and feed brake master cylinder out of brake booster.

Installation

Replace self-locking nuts.

Tightening torque 34 31 1AZ .

Installation

Replace sealing ring.

Scheme 54

Installation

When inserting the brake master cylinder (2) into the brake booster (1), make sure the pressure rod of the brake booster and that of the brake master cylinder meet each other on one level.

Scheme 55

After installation

1. Bleeding brake system with DSC

Scheme 56

34 32 861 Replacing all brake pipes

Special tools required

1. 34 5 100

See BRAKES - SPECIAL TOOLS .

Note. The brake lines are only supplied in the straight version and correct length with connecting nipple. Read and comply with General Information . After completing work, Bleed brake system . Observe safety instructions on raising the vehicle . See 00 ... ... LIFTING VEHICLE WITH A LIFTING PLATFORM .

New brake lines are bent into shape with bending tool 34 5 100 .

Removed brake pipes can be used as templates for bending.

Scheme 57

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

34 32 881 Replacing front left or right brake hoses

Note. Read and comply with General Information .

After completing work: Bleed braking system

Press clutch pedal down to floor and secure with pedal support.

Note. The pedal support may only be released when the brake lines are reconnected. This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

Cars up to model year approx. 07/05

Pull brake hose out of holder (1).

Detach brake hose from brake line (2).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Detach brake hose from brake caliper (4).

Installation

Tightening torque 34 32 2AZ . See 34 32 BRAKE LINES .

Cars from model year approx. 07/05

Pull brake hose out of both holders (1).

Detach brake hose from brake line (3).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Detach brake hose from brake caliper (4).

Scheme 58

Installation

Tightening torque 34 32 2AZ . See 34 32 BRAKE LINES .

34 32 951 Replacing rear left or right brake hose (between rear axle carrier and body)

Special tools required

1. 34 3 170

See BRAKES - SPECIAL TOOLS .

Necessary preliminary tasks

1. Remove rear left wheel

Note. Read and comply with General Information . After completing work: Bleed brake system .

Press clutch pedal down to floor and secure with pedal support.

Note. The pedal support may only be released when the brake lines are reconnected. This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

Disconnect brake hose from brake line (1).

Detach brake hose from brake line (2) and remove brake hose (3).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Scheme 59

Installation

Use torque wrench (Hazet 6282-1CT with reversible ratchet head).

Tighten brake line using torque wrench (1) and special tool 34 3 170 .

Scheme 60

34 32 980 Replacing rear left or right brake hose (between brake caliper and pipe)

Note. Read and comply with General Information .

After completing work: Bleed braking system

Press clutch pedal down to floor and secure with pedal support.

Note. The pedal support may only be released when the brake lines are reconnected. This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

Disconnect brake hose from brake line (1).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Detach brake hose from brake caliper (3).

Installation

Tightening torque 34 32 3AZ . See 34 32 BRAKE LINES .

Installation

First tighten brake hose on brake caliper.

Insert brake hose in bracket and screw onto brake pipe.

34 33 071 Replacing vacuum hose for brake booster (on brake booster)

Necessary preliminary tasks

1. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .
2. Remove «brake master cylinder»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-31-505-removing-and-installingreplacing)

Unlock quick-release fastener (1) and pull out vacuum line (2).

Scheme 61

Disconnect plug connection (1) from differential pressure sensor.

Unfasten hose clip (2).

Pull off vacuum hose (3).

Pull vacuum hose (4) out of brake booster.

Feed out vacuum hose (4).

Installation

Replace hose clamp (2).

Check sealing ring (5) in brake booster and replace if necessary.

Scheme 62

34 33 075 Removing and installing/replacing vacuum pump (S65)

Necessary preliminary tasks

1. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .
2. Remove front left wheel

Release screws (1).

Press wheel arch cover (2) forwards slightly in direction of arrow.

Scheme 63

Unlock quick-release fastener (2) and detach vacuum hose.

Disconnect plug connection (4).

Release nut (3) and pull vacuum pump (1) upwards out of bracket.

Scheme 64

34 33 505 Removing and installing or replacing brake booster

Necessary preliminary tasks

1. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .
2. Remove «brake master cylinder»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-31-505-removing-and-installingreplacing)
3. Remove «hydraulic unit»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-51-527-removing-and-installing)
4. Remove left footwell trim. See «51 45 185 REMOVING AND INSTALLING/REPLACING PANEL FOR PEDALS»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#body-equipment-repair-e9293-m3__51-45-185-removing-and-installingreplacing) .

Detach locking clip (1) from brake pedal, disengage and pull out locking pin.

Unscrew nuts (2).

Installation

Replace self-locking nuts.

Tightening torque 35 11 1AZ . See 35 11 PEDAL ASSEMBLY CONSOLE .

Carefully pull brake booster (1) out of bulkhead and tilt out. If necessary, disengage brake line from holder on bulkhead and press slightly to one side.

Replacement

Modify non-return valve .

Scheme 65

34 35 001 Replacing a brake pad sensor (front)

Necessary preliminary tasks

1. Remove wheel

Open plug housing (1).

Disconnect plug connection (2).

Feed brake pad sensor out of holders (3).

Scheme 66

Press clip (1) together and detach brake pad sensor (2) in direction of arrow from brake pad (3).

Installation

Make sure clip (1) and brake pad sensor (2) are correctly seated in brake pad (3).

Scheme 67

34 35 003 Replacing a brake pad sensor (rear)

Necessary preliminary tasks

1. Remove rear right wheel

Slacken nut (1).

Pull wheel arch trim (2) gently to one side.

Disengage cable from holders (3).

Scheme 68

Disconnect plug connection (1).

Installation

Ensure proper locking of the plug connector and proper seating of the cable in the brackets.

Scheme 69

Disengage cable from holders (1).

Detach brake pad wear sensor (2) in direction of arrow from brake caliper (3).

Installation

Make sure holders (1) and brake pad wear sensor (2) are correctly seated in brake caliper.

Scheme 70

34 10 014 Adjusting handbrake

Special tools required

1. 32 1 030

See STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS

Perform inspection in the following manner

When 1st ratchet is engaged, no braking force should be exerted.

The difference in wheel circumferential forces between the left and right wheels may deviate by max. 30 % from the greater value (measured on brake analyzer).

In event of larger deviations of wheel circumferential force: carry out readjustment.

Braking with locked wheels must be possible with the parking brake.

The parking brake must be reset if the actuation stroke is greater than 10 teeth.

Note. Accurate adjustment of the parking brake is only possible if the parking brake Bowden cables and all moving parts on the parking brake move easily and function correctly. Basic setting of the parking brake is required whenever

1. Parking brake shoes and attachment parts are replaced
2. Brake discs are replaced
3. In event of excessive actuation stroke (10 teeth)
4. When replacing parking brake Bowden cables

Scheme 71

Scheme 72

Scheme 73

1. Setting instruction for brake shoes (basic setting) Unclip gaiter for parking brake lever. Lock adjuster unit (ASZE). Actuate parking brake lever. Screw in special tool 32 1 030 partially. Press stop (1) of adjusting spring back to such an extent that retaining hook (2) engages in stop (1). Completely unscrew one wheel stud on each rear wheel. Installation: Tightening torque 36 10 1AZ . See «36 10 WHEELS»(/bmw/m3/e90-2007-2013/remont/wheel-tire-system/#wheel-and-tires-tightening-torque-e92e93__36-10-wheels) . Turn wheel until adjustment screw is visible in tapped hole. Turn adjusting screw with a screwdriver until wheel cannot be turned anymore by hand. Then at adjusting screw: Release 185 dia. duo-servo brake 8 notches Release 160 dia. duo-servo brake 9 notches IMPORTANT: Basic adjustment with fewer than 8 notches on the duo-servo brake may lead to the brake shoes being damaged. Reducing the number of notches on the duo-servo brake to shorten lever travel is not permitted. Unlock adjuster unit (ASZE). Lever out restraining hook (2) with a suitable screwdriver. Restraining hook (2) must detach from stop (1) of adjusting spring. IMPORTANT: Follow instructions for «Brake testing»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-009-checking-brakes-on) for test stand.
2. Setting instruction for parking brake Bowden cables The parking brake lever must be applied 5 times with medium hand force. On brake analyzer 0th tooth (parking brake released): Vehicles with manual transmission: Shift lever in neutral position. Vehicles with automatic transmission: Selector lever position "N". Without locking differential < or = 150 N. With locking differential < or = 200 N (possibly odd display). 1st tooth: No increase in braking force with regard to 0th tooth. Indicator lamp can be lit. 2nd tooth: Indicator lamp must be lit. 3rd tooth: Increase in braking force. 5th tooth: The brake force display must have reached > or = 400 N. Checking brake force differential at wheel: Apply parking brake until a wheel circumferential force (brake force display) of min. 1000 N is reached. Max. permitted brake force differential right/left < or = 35 % (referred to greater brake value).
3. Braking in the duo-servo parking brake The following braking-in procedures are applicable in case of insufficient braking effect or after replacing brake discs and/or brake shoes. On brake analyzer Apply parking brake lever until wheel circumferential force at first wheel is 800 N. Lock parking brake lever in next lower tooth. Release parking brake lever after approx. 2 minutes. When driving on road (If possible inside the company grounds or on an unused road) When driving at low speed (max. 40 km/h) apply parking brake lever until a braking effect can be felt. Pull parking brake lever into the next notch and continue driving for approx. 400 metres (max. 40 km/h). A basic requirement is that parking brake is adjusted uniformly.

Note. If necessary, repeat braking-in procedure. Allow brake to cool down sufficiently.

Scheme 74

34 41 ... Removing and installing or replacing gaiter for handbrake lever

Special tools required

1. 00 9 317

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS -- 128I .

Unclip gaiter with special tool 00 9 317 .

Scheme 75

Pull gaiter (1) over handbrake lever.

Cut cable ties (2) and remove gaiter.

Installation

Eye of cable tie must face downward

Scheme 76

34 41 000 Removing and installing / replacing handbrake lever

Special tools required

1. 32 1 030

See STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS

Necessary preliminary tasks

1. Disconnect battery negative lead
2. Remove airbag control unit. See «65 77 016 REMOVING AND INSTALLING/REPLACING AIRBAG CONTROL UNIT»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#audio-navigation-anti-theft-restraint-repair-e9293__65-77-016-removing-and-installingreplacing) .

Note. If the parking brake lever is replaced, the handbrake lever grip must also be replaced.

Lock adjuster unit (ASZE).

Actuate parking brake lever. Screw in special tool 32 1 030 partially. Press stop (1) of adjusting spring back to such an extent that retaining hook (2) engages in stop (1).

Installation

Unlock adjuster unit (ASZE).

Lever out restraining hook (2) with a suitable screwdriver.

Restraining hook (2) must detach from stop (1) of adjusting spring.

Release screws (1).

Tightening torque 34 41 5AZ . See 34 41 PARKING BRAKE .

Remove bracket for centre console (2).

Scheme 77

Disconnect cable (1) from handbrake check switch.

Unclip cable bracket (2) at point (3).

Remove cable bracket and place forward.

Scheme 78

Press retainer (1) in balance arm (2) forward in direction of arrow.

Detach handbrake Bowden cables (3) from balance arm (2).

Scheme 79

Release nuts (1) and remove parking brake lever (2).

Installation

Replace self-locking nuts.

Tightening torque 34 41 1AZ . See 34 41 PARKING BRAKE

Parking brake lever and adjustment unit (ASZE) are only exchanged completely as a single unit.

Scheme 80

34 41 071 Replacing handle for handbrake lever

Necessary preliminary tasks

1. Remove «gaiter for handbrake lever»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-41-removing-and-installing)

Pull off handle for handbrake lever (1) in direction of arrow.

Installation

Handbrake lever grip (1) must snap audibly into place.

Scheme 81

34 41 120 Removing and installing or replacing both handbrake Bowden cables

Special tools required

1. 32 1 030

See STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS

Necessary preliminary tasks

1. Remove airbag control unit . See «65 77 016 REMOVING AND INSTALLING/REPLACING AIRBAG CONTROL UNIT»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#audio-navigation-anti-theft-restraint-repair-e9293__65-77-016-removing-and-installingreplacing) .

Note. After completing work

1. «Adjusting parking brake»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-10-014-adjusting-handbrake)

Lock adjuster unit (ASZE).

Actuate parking brake lever. Screw in special tool 32 1 030 partially. Press stop (1) of adjusting spring back to such an extent that retaining hook (2) engages in stop (1).

Scheme 82

Press retainer (1) in balance arm (2) forward in direction of arrow.

Detach handbrake Bowden cables (3) from balance arm (2).

Release screw (1) and remove holder (2).

Installation

Tightening torque 34 41 2AZ . See 34 41 PARKING BRAKE

Scheme 83

Note. To release the parking brake Bowden cable from the expander lock, it is necessary to remove the brake disc on the following vehicles

1. E90 320xd, 325xi, 328xi, 330i, 330xi, 330d, 330xd, 335i, 335xi, 335d, M3
2. All E91
3. E92 320xd, 325xi, 325d, 328xi, 330i, 330xi, 330d, 330xd, 335i, 335xi, 335d, M3
4. E93 320i, 323i, 325i, 325d, 328i, 330i, 330d, 335i, M3

Release one wheel stud.

Bring wheel into position (tapped hole turned down approx. 20° from horizontal).

F = direction of travel

Installation

Reinstall wheel stud only after handbrake has been adjusted.

Tightening torque 36 10 1AZ . See 36 10 WHEELS .

Scheme 84

Nipple (1) and expander lock (2) are visible through tapped hole.

Push in core of handbrake cable in direction of expander lock as far as it will go and grip firmly.

Press nipple (1) downwards through tapped hole with a screwdriver.

Pull handbrake cables out of wheel carrier.

Scheme 85

Installation

Insert handbrake cable into brake carrier/brake guard plate. Sleeve must be inserted up to stop.

Nipple of handbrake cable must audibly snap into place in expander lock.

Disconnect handbrake cables from holders (1).

Pull handbrake cables towards rear out of guide tube.

Scheme 86

34 41 140 Removing and installing or replacing guide tube for handbrake cables

Special tools required

1. 32 1 030

See STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS

Necessary preliminary tasks

1. Disconnect battery negative lead
2. Remove airbag control unit . See «65 77 016 REMOVING AND INSTALLING/REPLACING AIRBAG CONTROL UNIT»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#audio-navigation-anti-theft-restraint-repair-e9293__65-77-016-removing-and-installingreplacing) .
3. Remove propeller shaft. See «26 11 000 REMOVING AND INSTALLING COMPLETE PROPELLER SHAFT (CONSTANT-VELOCITY JOINT)»(/bmw/m3/e90-2007-2013/remont/driveshaft-universal-joints/#propeller-shaft-repair-e92e93__26-11-000-removing-and-installing) .

Lock adjuster unit (ASZE).

Actuate parking brake lever. Screw in special tool 32 1 030 partially. Press stop (1) of adjusting spring back to such an extent that retaining hook (2) engages in stop (1).

Installation

Unlock adjuster unit (ASZE).

Lever out restraining hook (2) with a suitable screwdriver.

Restraining hook (2) must detach from stop (1) of adjusting spring.

Press retainer (1) in balance arm (2) forward in direction of arrow.

Detach handbrake Bowden cables (3) from balance arm (2).

Pull handbrake cables out of guide tube.

Release screws (1).

Release screws (2) and feed out guide tube (3) towards bottom.

Installation

Replace seal.

Tightening torque 34 41 4AZ . See 34 41 PARKING BRAKE

Scheme 87

After installation

1. Adjusting «parking brake»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-10-014-adjusting-handbrake)

34 41 220 Removing and installing/replacing all handbrake shoes

Special tools required

1. 32 1 030
2. 34 4 000

See STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS

See BRAKES - SPECIAL TOOLS .

Necessary preliminary tasks

1. Remove rear «brake disc»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-21-320-removing-and-installing)

Lock adjuster unit (ASZE).

Actuate parking brake lever. Screw in special tool 32 1 030 partially. Press stop (1) of adjusting spring back to such an extent that retaining hook (2) engages in stop (1).

Installation

Unlock adjuster unit (ASZE).

Lever out restraining hook (2) with a suitable screwdriver.

Restraining hook (2) must detach from stop (1) of adjusting spring.

Scheme 88

Disconnect return spring (1) with brake spring pliers.

Installation

Return spring (1) must not be overelongated.

Check and if necessary replace return spring (1).

Pay attention to installation position of adjustment screw (2).

Apply a thin coat of grease to bush and screw threads.

Scheme 89

Disconnect return spring (1) with brake spring pliers.

Installation

Return spring (1) must not be overelongated.

Check and if necessary replace return spring (1).

Scheme 90

Turn clamping pins (1) with special tool 34 4 000 through 90° and disconnect.

Remove brake shoes (2).

Scheme 91

After installation

1. Adjusting «parking brake»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-10-014-adjusting-handbrake)

34 41 250 Removing and installing/replacing expander lock for handbrake shoes

Special tools required

1. 32 1 030

See STEERING AND WHEEL ALIGNMENT - SPECIAL TOOLS

Necessary preliminary tasks

1. Remove «handbrake shoes»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-41-220-removing-and-installingreplacing)

Lock adjuster unit (ASZE).

Actuate parking brake lever. Screw in special tool 32 1 030 partially. Press stop (1) of adjusting spring back to such an extent that retaining hook (2) engages in stop (1).

Installation

Unlock adjuster unit (ASZE).

Lever out restraining hook (2) with a suitable screwdriver.

Restraining hook (2) must detach from stop (1) of adjusting spring.

Pull expander lock (1) forwards, disconnect handbrake Bowden cable (2) and remove expander lock.

Scheme 92

After installation

1. Adjusting «parking brake»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-10-014-adjusting-handbrake)

34 51 527 Removing and installing or replacing DSC hydraulic unit

Necessary preliminary tasks

1. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .
2. Remove lower section of microfilter housing . See «MICROFILTER»(/bmw/m3/e90-2007-2013/remont/automatic-hvac-system/#heating-and-air-conditioning-repair-e9293) .
3. Extract brake fluid

Note. Extract brake fluid out of expansion tank. Use a suction bottle used exclusively for drawing off brake fluid. Do not reuse drawn out brake fluid.

After completing work

1. Bleeding braking system

Press cover (2) slightly to one side and disconnect plug connection (1).

Unfasten brake lines (3).

Installation

Tightening torque 34 32 1AZ . See 34 32 BRAKE LINES .

Scheme 93

Unscrew nuts (1).

Installation

Tightening torque 34 51 6AZ . See 34 51 SLIP CONTROL SYSTEM (DSC) .

Scheme 94

Tilt out hydraulic unit (1) in direction of side panel.

Scheme 95

When replacing hydraulic unit

Release screws (1) and convert holder (2).

Installation

Tightening torque 34 51 5AZ . See 34 51 SLIP CONTROL SYSTEM (DSC) .

Modify DSC control unit .

Scheme 96

When replacing control unit

1. Carry out programming/coding and Adjustment of steering angle sensor using scan tool.
2. Mix-up check of brake lines

Scheme 97

34 52 516 Removing and installing / replacing DSC control unit

Necessary preliminary tasks

1. Remove «hydraulic unit»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-51-527-removing-and-installing)

Release screws (1) and carefully detach control unit (2) towards front.

Scheme 98

Scheme 99

Installation

Keep sealing faces clean.

Replace screws.

Observe tightening sequence (1-4).

Tightening torque 34 51 1AZ . See 34 51 SLIP CONTROL SYSTEM (DSC) .

Scheme 100

Replacement

1. Carry out programming/coding , Steering angle sensor adjustment and adjustment for active front steering using scan tool.
2. Mix-up check of brake lines
3. Function check, hydraulic unit

34 52 525 Replacing one front pulse generator

Note. Read and comply with General Information .

Open plug housing (1), pull plug connection (2) out of bracket and disconnect.

Pull cable with rubber grommet out of holders (3).

Installation

Ensure proper locking of plug connector and proper seating of rubber grommets.

Scheme 101

Release hexagon socket head cap screw (1) and pull wheel speed sensor (2) out of bore.

Installation

Tightening torque 34 51 4AZ . See 34 51 SLIP CONTROL SYSTEM (DSC) .

Clean bore for pulse generator and lubricate with Staburags NBU 12/K grease.

Scheme 102

34 52 535 Replacing a rear pulse generator

Necessary preliminary tasks

1. Remove wheels .
2. Read and comply with «General Information»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-00-general-information) .

Slacken nut (1).

Pull wheel arch trim (2) gently to one side.

Disengage cable from holders (3).

Scheme 103

Disconnect plug connection (1).

Installation

Ensure proper locking of the plug connector and proper seating of the cable in the brackets.

Scheme 104

Disengage cable from holders (1).

Unfasten socket head cap screw (2).

Withdraw wheel speed sensor (3) from bore hole.

Installation

Tightening torque 34 51 4AZ . See 34 51 SLIP CONTROL SYSTEM (DSC) .

Clean bore for pulse generator and lubricate with Staburags NBU 12/K grease.

Scheme 105

34 52 550 Removing and installing / replacing DSC sensor

Necessary preliminary tasks

1. Remove left front seat . See «SEATS - REPAIR INSTRUCTIONS (SEDAN/COUPE)»(ref-351051) or «SEATS - REPAIR INSTRUCTIONS (CONVERTIBLE)»(/bmw/m3/e90-2007-2013/remont/seats/#seats-repair-e9293) .
2. Remove front left entrance cover strip . See «51 47 000 REMOVING AND INSTALLING/REPLACING FRONT (INSIDE) LEFT OR RIGHT ENTRANCE COVER STRIP»(/bmw/m3/e90-2007-2013/remont/door-locks-anti-theft-systems/#body-equipment-repair-e9293-m3__51-47-000-removing-and-installingreplacing) .

Lift carpet (1) and fold back to side.

Remove underlay (2).

Disconnect plug connection.

Installation

Ensure proper locking of plug connector.

Slacken screws (3)

Release screws (4) and remove bracket with yaw sensor.

Installation

Tightening torque 34 51 3AZ . See 34 51 SLIP CONTROL SYSTEM (DSC) .

Scheme 106

When replacing DSC sensor

Release screws (1) and modify DSC sensor (2).

Installation

Tightening torque 34 51 2AZ . See 34 51 SLIP CONTROL SYSTEM (DSC) .

Scheme 107

Carry out calibration/adjustment of DSC sensor.

34 52 700 Replacing DSC valve block

Necessary preliminary tasks

1. Remove «hydraulic unit»(/bmw/m3/e90-2007-2013/remont/mechanical-hydraulic/#brakes-repair-e92e93__34-51-527-removing-and-installing) .
2. Immediately close off all hydraulic connections with protective caps!
3. Clean outside of control unit.

Release screws (1). Firmly hold pump motor (3) together with valve block (4). Carefully detach control unit (2).

Scheme 108

Scheme 109

Remove valve block (2) from original packaging. Place valve block (2) straight on control unit (1) without twisting. Installation note: Replace screws (3). Tightening torque 35-53 INCH lbs. (4-6 N.m.)

Scheme 110

Installation note: When installing the hydraulic unit, only remove retaining tab (4) and screw plug (5) directly before connecting the brake lines. Bleed braking system

34 90 ... Troubleshooting brake system

TROUBLESHOOTING CHART

See also:
• BRAKES - SPECIAL TOOLS
• BRAKES - TECHNICAL DATA
• BRAKES - OPERATING FLUIDS
• 34 32 BRAKE LINES
• 34 11 FRONT BRAKE
• 34 21 REAR BRAKE
• 00 ... ... LIFTING VEHICLE WITH A LIFTING PLATFORM
• 51 45 185 REMOVING AND INSTALLING/REPLACING PANEL FOR PEDALS
• 35 11 PEDAL ASSEMBLY CONSOLE
• 36 10 WHEELS
• 65 77 016 REMOVING AND INSTALLING/REPLACING AIRBAG CONTROL UNIT
• 34 41 PARKING BRAKE
• 26 11 000 REMOVING AND INSTALLING COMPLETE PROPELLER SHAFT (CONSTANT-VELOCITY JOINT)
• MICROFILTER
• 34 51 SLIP CONTROL SYSTEM (DSC)
• SEATS - REPAIR INSTRUCTIONS (CONVERTIBLE)
• 51 47 000 REMOVING AND INSTALLING/REPLACING FRONT (INSIDE) LEFT OR RIGHT ENTRANCE COVER STRIP
• Brake testing on test stand
• General Information
• Bleeding brake system with DSC
• brake discs
• brake pad wear sensor
• braking in new brake discs / brake pads
• brake pads
• expander lock
• brake pads
• parking brake
• brake master cylinder
• hydraulic unit
• gaiter for handbrake lever
• brake disc
• handbrake shoes
• DSC control unit