Anti-Lock Brake System Audi Q5 I

Applies to Hybrid Vehicles

1. Before performing repair work on the anti-lock brake system, determine the cause of the malfunction using On-Board Diagnostics (OBD).
2. When installing a new hydraulic control unit, the coding must be checked. Use the vehicle diagnostic tester.
3. Switch ignition off before installation work. On vehicles with coded radio unit, determine code and disconnect battery ground strap.
4. When working with brake fluid, observe relevant safety precautions and notes, refer to «GENERAL INFORMATION»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#general-technical-data-brake-system) .
5. Bleed the brake system with the brake charger/bleeder unit VAS 5234 for all work that requires opening the hydraulic system. High and low pressure testing should also be performed on the brake system «HIGH AND LOW PRESSURE TESTING»(/audi/q5/i-2008-2012/remont/brakes-control-systems/#hydraulic-components-brake-system__high-and-low-pressure-testing)
6. During the final road test, perform an ABS-controlled braking at least one time (pulsing must be felt in the brake pedal). See vehicle diagnostic tester.
7. Absolute cleanliness is required when working on the anti-lock brake system, it is not permitted to use any products which contain mineral oil, such as oils, greases etc.
8. Thoroughly clean all unions and the adjacent areas before loosening. Do not use aggressive cleaning agents such as brake cleaner, fuel, thinners or similar chemicals.
9. Place parts that have been removed on a clean surface and cover.
10. Carefully cover or seal open components, if repairs are not carried out immediately. (Sealing plugs, use repair kit 1 H0 698 311 A)
11. Only use lint-free cloths.
12. Only unpack replacement parts immediately prior to installation.
13. Only use genuine parts in their original packaging.
14. Do not work with compressed air and do not move vehicle while the system is open.
15. Make sure that brake fluid does not enter harness connectors.

ABS/ELECTRONIC STABILIZATION PROGRAM, BOSCH 8.1, COMPONENT OVERVIEW

Applies to Hybrid Vehicles

The Bosch ESP 8.1 has the following functions

1. ABS - Anti-lock braking system
2. ASR - Anti-slip regulation
3. EBD - Electronic brake pressure distribution
4. EDL - Electronic differential lock
5. ESP - Electronic stabilization program
6. FBS - Fading brake support
7. HBA - Hydraulic brake assist
8. MSR - Engine drag torque regulation
9. Emergency braking signal
10. Brake disc cleaning
11. Trailer stabilization

The brake system is distributed diagonally. The vacuum brake servo unit boosts the brakes pneumatically.

Note. ABS malfunctions do not affect the brake system and the booster. Conventional brake system stays operative even without ABS. A change in braking behavior should be checked. When the ABS warning lamp comes on the rear wheels can lock-up early when braking!

Malfunction sources are reduced by direct connection of components named. The components are replaced instead of repaired.

Scheme 5

1. Right Rear ABS Wheel Speed Sensor -G44- Removing and Installing, refer to «Right Rear ABS Wheel Speed Sensor -G44- /Left Rear ABS Wheel Speed Sensor -G46»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__right-rear-abs-wheel-speed-sensor) . Can be tested in "guided fault finding" with the vehicle diagnostic tester.
2. Left Rear ABS Wheel Speed Sensor -G45- Removing and Installing, refer to «Right Rear ABS Wheel Speed Sensor -G44- /Left Rear ABS Wheel Speed Sensor -G46»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__right-rear-abs-wheel-speed-sensor) .
3. ESP Sensor Unit -G419- Installed location: under the left front seat. Removing and Installing, refer to «ESP Sensor Unit -G419»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__esp-sensor-unit-g419) . 9 Nm Combined transverse acceleration sensor -G200-. rotation rate sensor -G202-, and longitudinal acceleration sensor -G251-. Can be tested in "guided fault finding" with the vehicle diagnostic tester. Observe installation instructions. Check the arrow in the direction of travel when installing.
4. Brake Lamp Sensor Installed location: on the brake pedal. Removing and Installing, refer to «BRAKE LAMP SENSOR»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__brake-lamp-sensor) . Can be tested in "guided fault finding" with the vehicle diagnostic tester. NOTE: Cannot be reused after removal.
5. Brake Pedal With bracket for the brake lamp sensor. Removing and Installing, with Manual Transmission, refer to «BRAKE PEDAL, WITH MANUAL TRANSMISSION»(/audi/q5/i-2008-2012/remont/mechanical-hydraulic/#mechanical-components-brake-system__brake-pedal-with-manual-transmission) . Removing and Installing, with Automatic Transmission, refer to «BRAKE PEDAL, WITH AUTOMATIC TRANSMISSION»(/audi/q5/i-2008-2012/remont/mechanical-hydraulic/#mechanical-components-brake-system__brake-pedal-with-automatic-transmission) .
6. Electro-Mechanical Parking Brake Indicator Lamp -- Located in the tachometer. Lights up when the parking brake is engaged and the ignition is switched on. Lights up for approximately 30 seconds when the parking brake is engaged and the ignition is switched off. Blinks after engaging the parking brake if the brake pressure is not sufficient to prevent the vehicle from rolling. NOTE: The indicator light must go out when the parking brake is released.
7. Brake System Warning Lamp -- Located in the tachometer. Turns on with the ABS indicator lamp when the ABS system malfunctions. Blinks when the brake fluid is too low. Blinks when there is a malfunction in the brake system. NOTE: The malfunction is indicated more precisely when the "SET button" in the instrument cluster is pressed.
8. ABS Warning Lamp -- NOTE: The indicator lamp monitors the ABS and the Electronic Differential Lock (EDL). Installed location: in the tachometer. Lights up for several seconds when ignition is switched on and goes out after an automatic ABS system self-check if there are no malfunctions in the ABS system. There is an ABS malfunction if the indicator light: Does not light up when ignition is switched on, Does not go out after a few seconds, Lights up while driving. The vehicle can be stopped with the standard brake system. However, a change in braking behavior should be checked. NOTE: The Electronic Differential Lock (EDL) and ABS work together. The ABS indicator light lights up when the EDL malfunctions.
9. ABS/ESP Control Lamp -- Installed location: in the tachometer. Blinks when driving if ESP/ASR engages regularly. Comes on when ignition is switched on and goes out after a short self-check. Comes on if there is an ESP system malfunction. Comes on if there is an ABS system malfunction because ESP and ABS work together. Comes on when ESP/ASR is switched off. Comes on during sensor programming if: The battery was disconnected and connected. Vehicle was started with jump start. The battery is too weak. after the sensor programming procedure, the ESP light goes out after driving a short distance.
10. Left Front ABS Wheel Speed Sensor -G47- Removing and Installing, refer to «Right Front ABS Wheel Speed Sensor -G45- /Left Front ABS Wheel Speed Sensor -G47»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__right-front-abs-wheel-speed-sensor) . Can be tested in "guided fault finding" with the vehicle diagnostic tester.
11. ABS Control Module -J104- Removing and Installing, refer to «ABS Hydraulic Unit -N55- WITH ABS Control Module -J104»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__abs-hydraulic-unit-n55-with-abs) .
12. Return Ring Installation location: installed on the steering column with the slip ring, Removing and Installing, refer to «Steering Angle Sensor -G85»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__steering-angle-sensor-g85) .
13. Steering Angle Sensor -G85- Installed location: in the coil ring with slip ring on steering column. Removing and Installing, refer to «Steering Angle Sensor -G85»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__steering-angle-sensor-g85) . Perform zero adjustment using the vehicle diagnostic tester.
14. Right Front ABS Wheel Speed Sensor -G45- Removing and Installing «Right Front ABS Wheel Speed Sensor -G45- /Left Front ABS Wheel Speed Sensor -G47»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__right-front-abs-wheel-speed-sensor) .
15. ASR/ESP Button -E256- The installation location depends on the model «ASR/ESP SWITCH»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__asresp-switch) . Switches the ESP/ASR off and on.
16. Audi Hold Assist Pressure Switch Located in the center console. Function, refer to «AUDI HOLD ASSIST»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__audi-hold-assist) . Removing and Installing, refer to «AUDI HOLD ASSIST SWITCH»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__audi-hold-assist-switch) .
17. Parking Brake Pressure Switch -F234- Located in the center console. Removing and Installing, refer to «ELECTRO-MECHANICAL PARKING BRAKE SWITCH»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__electro-mechanical-parking-brake-switch) .
18. Diagnostic Connection Installed location: driver side footwell cover.
19. Roof Rack Recognition Sensor -G625- NOTE: The roof rack recognition sensor -- is always installed in the left roof railing on both LHD and RHD vehicles. The sensor cannot be replaced by itself. It is part of the left roof railing. Removing and installing, refer to «Roof Rack Recognition Sensor -G625»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__roof-rack-recognition-sensor-g625) .

Scheme 6

ASR/ESP SWITCH

The installation location of the switch depends on the model.

Illustration, vehicle with MMI, ESP switch -arrow-.

Scheme 7

AUDI HOLD ASSIST

The vehicle is equipped with Audi Hold Assist depending on the model.

Function

The function assists the driver if the vehicle must remain stopped frequently or for long periods of time when the engine is running.

When the vehicle is stopped and the function is activated, the vehicle is held in place by Audi Hold Assist.

The driver can release the brake pedal.

The vehicle is held in place by maintaining the brake pressure on all four wheels in ESP.

To prevent the ESP solenoid valves to overheat when stopped for long periods of time, the rear electro-mechanical parking brake automatically takes over braking when the solenoid valves reach a temperature of 200° C.

The point when the brakes automatically release is based on the following information

1. Engine speed
2. Angle
3. Gear engaged
4. With manual transmissions, distance on the clutch pedal through the clutch sensor.
5. With automatic transmissions, through converter release.

To prevent the vehicle from rolling back, the brakes are only released when there is sufficient engine torque.

Activation

The following conditions must be fulfilled to switch the "stand by" function on

1. Driver wearing seat belt.
2. Engine running.
3. Driver door closed.
4. No ESP and electronic parking brake malfunctions.

The switch -2- in the center console activates the function.

Scheme 8

The switch indicates the operating conditions.

1. Deactivated - the LED in the switch is off.
2. Stand by - the LED in the switch is on.
3. Active - the LED in the switch is on and the instrument cluster display shows a green "P".

Braking function is only transferred from ESP to the electronic parking brake if the "green P" in the instrument cluster is visible and if

1. The solenoid valves in ESP have reached a temperature of 200° C.
2. The driver door is opened.
3. The driver seat belt is unlatched.
4. The engine is stopped.
5. The ignition is switched off.
6. The switch is operated.
7. The brake pedal or gas pedal are pressed.
8. The Audi Hold Assist switch is operated without pressing the brake.

Note. When braking function is transferred from the ESP to the electronic parking brake, the instrument cluster display changes from a "green P" to a "red P".

VAS 5051B/ 5052 CONNECTING AND SELECTION FUNCTIONS

Special tools and workshop equipment required

1. Vehicle Diagnostic Tester VAS 5051 B or VAS 5052

Connect diagnosis cable connector to data link connector.

Switch tester on.

Switch on ignition.

Touch the field / the button on the screen: Guided Fault Finding

Select in succession

1. Brand
2. Type
3. Model year
4. Version
5. Engine Code

Confirm data entered.

Wait until tester has checked all control modules in vehicle.

Press the go to button and select "function/component selection".

Select "suspension" on the display.

Select "brake system" on the display.

Select "01-On Board Diagnostic (OBD) capable system..." indicated on display.

Select on display "Anti-lock brake system...".

Select on display "Function".

Now, all possible functions of the anti-lock brake system installed in the vehicle will be displayed.

Select desired function on display.

ABS/ELECTRONIC STABILIZATION PROGRAM SPEED SENSOR, OVERVIEW

Right front illustration

Scheme 9

1. Right Front ABS Wheel Speed Sensor -G45- /Left Front ABS Wheel Speed Sensor -G47
2. Hex Socket Head Bolt 9 Nm

ABS HYDRAULIC UNIT -N55- WITH ABS CONTROL MODULE -J104-, OVERVIEW

Applies to Hybrid Vehicles

Scheme 10

1. ABS Hydraulic Unit -- with ABS Control Module -- Installed location: in the front left engine compartment. Removing and Installing, refer to «ABS Hydraulic Unit -N55- WITH ABS Control Module -J104»(/audi/q5/i-2008-2012/remont/anti-locktraction-control/#anti-lock-brake-system__abs-hydraulic-unit-n55-with-abs) . The hydraulic control unit is comprised of the ABS hydraulic unit with integrated brake pressure sensor and the ABS control module. The components must not be separated from each other. Do not disconnect the connector before successfully completing OBD. Switch the ignition off before disconnecting the connector. The brake pressure sensor 1 -G201- is integrated into the ABS hydraulic unit and cannot be replaced. CAUTION: The ABS hydraulic unit and ABS control module must not be separated from each other.
2. ESP Bracket The bracket cannot be removed.
3. ABS Control Module -- Electrical Connector
4. Brake Line To the brake master cylinder. 14 Nm
5. Brake Line To the brake master cylinder. 14 Nm
6. Brake Lines Hydraulic unit to right front brake caliper. 14 Nm Hydraulic unit to front left brake caliper. 14 Nm Hydraulic control unit to rear left brake caliper. 14 Nm Hydraulic control unit to rear right brake caliper. 14 Nm

FASTENER TIGHTENING SPECIFICATIONS

ABS Hydraulic Unit -N55- WITH ABS Control Module -J104

The ABS hydraulic unit -- with ABS control module -- is located in the left front of the engine compartment.

Scheme 11

Special tools and workshop equipment required

1. Brake Pedal Actuator V.A.G 1869/2
2. Repair Kit Plugs 1H0 698 311 A

Removing

Read the control module version and make a note of it.

Use the vehicle diagnostic tester.

Disconnect the battery, refer to [For engine(s) CAEB, CALB] Removal and Installation , noting the radio code.

Insert the V.A.G 1869/2 between the brake pedal and driver seat by pressing the brake pedal down at least 60 mm. By doing this, the valves in the brake master cylinder are closed and the brake fluid reservoir does not run empty.

Scheme 12

Connect the hose from a bleeder bottle to the bleeder screw on the left front caliper.

Connect the hose from a bleeder bottle to the bleeder screw on the left front caliper.

Open the bleeder screws on the left front and rear brake calipers to reduce the pressure in the ABS hydraulic unit --.

Close the left front and left rear bleeder screws.

Note. Do not remove the V.A.G 1869/2.

Press the securing clip on the connector to the control module -1- up.

Scheme 13

Pull the securing bracket in the -direction of the arrow- and remove the connector.

Scheme 14

Note. Make sure that no brake fluid enters control module connector housing. This could lead to corrosion of the contacts and thereby cause the system to fail. A contaminated connector housing must be carefully cleaned with compressed air.

To protect against escaping brake fluid, place a lint-free cloth in the area under the ABS control module -- and ABS hydraulic unit --.

Mark the brake lines for installation later.

Remove the brake lines from the ABS hydraulic unit -- and brake master cylinder.

Remove the remaining brake lines -arrows- from the ABS hydraulic unit --.

Seal brake lines and threaded holes with plugs from repair kit.

Carefully remove the ABS hydraulic unit -- together with the ABS control module -- upward from the bracket.

Note. When removing the ESP control unit from the bracket, make sure the rubber buffers do not fall into the engine compartment.

Set theABS hydraulic unit -- with the ABS control module -- down on a clean, level surface.

Seal the threaded holes and brake lines with plugs after removing the ABS control module -- and ABS hydraulic unit --.

Installing

Installation is the reverse of removal, with special attention to the following

Note. For customer service, the ABS hydraulic unit -- is filled with brake fluid. Remove the sealing plugs on the new ABS hydraulic unit -- when the corresponding brake line is going to be installed. If the sealing plugs are removed from the ABS hydraulic unit -- before installing the corresponding brake line, the brake fluid will drain. If that is the case, sufficient brake system bleeding can no longer be ensured.

All the rubber buffers must be inserted in the bracket.

Press the ABS hydraulic unit -- with the ABS control module -- down into the bracket in the vehicle.

When pressing the ESP control unit into the bracket, counterhold the rubber buffers so they do not fall through.

Connect the brake lines according to the markings.

Tighten all the brake lines -arrow- on the ABS hydraulic unit --.

After securing the brake lines on the ABS hydraulic unit --, perform output diagnostic test mode.

Note. By performing the output check diagnosis, it can be determined if the connections were interchanged.

Connect the electrical connector on the ABS control module --.

Press the locking bracket down until it engages audibly.

Press the securing clip -1- down and engage it.

Remove the brake pedal actuator V.A.G 1869/2.

Bleed the brake system. Refer to BRAKE SYSTEM, BLEEDING .

If ABS hydraulic unit -- was replaced, it must be coded.

Use the vehicle diagnostic tester for this.

On display, select

1. Chassis
2. Brake System
3. 01 - On Board Diagnostic (OBD) capable systems
4. 03 - Brake electronics

Select the following functions on the display

1. ABS/ASR/ESP control module J104
2. ABS/ASR/ESP control module J104, functions
3. J104 Coding control module

The following sensors should also be calibrated after replacing ABS control module

1. Steering angle sensor G85
2. Transverse acceleration sensor G200
3. Longitudinal acceleration sensor G251

Use the vehicle diagnostic tester for this.

On display, select

1. Chassis
2. Brake System
3. 01 - On Board Diagnostic (OBD) capable systems
4. 03 - Brake electronics

Select the following functions on the display

1. ABS/ASR/ESP control module J104
2. ABS/ASR/ESP control module J104, functions.

Then perform the ESP driving and system test.

AUDI HOLD ASSIST SWITCH

Removing

Remove the center console, refer to Center Console .

Remove the switch for the Audi Hold Assist -2-, refer to [For engine(s) CAEB, CALB] Removal and Installation .

Installing

Installation is performed in reverse sequence.

BRAKE LAMP SENSOR

Special tools and workshop equipment required

1. Release Tool for Brake Light Switch T40168 A

Applies to Hybrid Vehicles

Note. After removing, the brake lamp sensor can be re-used. The brake light sensor programs itself. It is not necessary to calibrate it after installation.

Removing

Remove the driver side storage compartment -1 to 3-.

Scheme 15

Disconnect the electrical connector to the footwell vent -C-.

Scheme 16

Remove the footwell vents -A-B-.

Disconnect the electrical connector to the brake light sensor.

Scheme 17

Note. If possible, leave the brake pedal stop -17- installed; it could break the mount for the brake lamp sensor -10- if the brake pedal is released too quickly.

Press the brake light sensor plunger -10- all the way in using a finger.

With the plunger pressed in, rotate the colored piece on the brake light sensor left as far as the stop to release the switch.

Note. The plunger must remained pressed in when releasing the brake light sensor.

Let go of the brake light sensor plunger after releasing.

Insert a T40168 A between the brake light sensor plunger and the brake pedal.

Note. The cone on the tool must face in the direction of the driver seat. The opening on the tool must align with the bulge on the brake light sensor.

Press the T40168 A A against the brake lamp sensor. This releases the three retaining tabs on the brake lamp sensor.

Remove the brake lamp sensor from the mount.

Installing

Note. If possible, leave the brake pedal stop -17- installed; it could break the mount for the brake lamp sensor -10- if the brake pedal is released too quickly.

Note. When installing the brake lamp sensor, the plunger adjusts itself automatically. The brake pedal must remain in end position during installation and must not be moved. The brake pedal must be connected with the brake booster.

Insert the brake lamp sensor in the mount on the brake pedal and press it in lightly.

Note. The brake lamp sensor must engage audibly with all three retaining tabs. The switch must not be rotated in the mount on the brake pedal. When installing the brake lamp sensor, the plunger adjusts itself automatically.

Rotate the colored piece on the brake lamp sensor to the right as far as the stop to secure the switch.

Connect the electrical connector to the brake lamp sensor.

Install the footwell vents -A- and -B-.

Tighten the footwell vent screw -A-.

Connect the electrical connector to the footwell vent -C-.

Install the driver side storage compartment -1 to 3-.

Note. Check the brake lamp sensor function after installing it and before driving.

ELECTRO-MECHANICAL PARKING BRAKE SWITCH

Applies to Hybrid Vehicles

Removing

Remove the center console, refer to Center Console .

Remove the parking brake contact switch -F321- -1-, refer to [For engine(s) CAEB, CALB] Removal and Installation .

The switch is clipped into the front of the center console on the side.

Installing

Install in reverse order of removal.

ESP Sensor Unit -G419

Applies to Hybrid Vehicles

Special tools and workshop equipment required

1. Torque Wrench V.A.G 1410

The ESP sensor unit -- is installed under the left seat on all models.

Removing

Note. The ESP sensor unit -- is always installed under the left front seat on both LHD and RHD vehicles.

The arrow on the ESP sensor unit -- points in the direction of travel.

Remove the left seat, refer to Removal and Installation .

Fold the bar on the carpet up.

On vehicles where the bar on the carpet is not cut through, cut through it using a sharp knife.

Remove the footwell vent.

Disconnect the connector -2-.

Scheme 18

Remove the sensor unit nuts.

Remove the ESP sensor unit -- -1- upward out of the vehicle.

Installing

Note. The arrow on the sensor unit points in the direction of travel.

Insert the ESP sensor unit -- -1- into the mounts from above.

When installing ESP Sensor Unit -- make sure it is correctly seated in its mounting and is free of stress.

Install and tighten the sensor unit nuts.

Connect the electrical connector -2-.

Install the footwell vent.

Fold the bar on the carpet down.

Install the left seat, refer to Removal and Installation .

Note. After replacing the ESP sensor unit, perform a basic setting (calibration) on the following sensors.

1. Transverse acceleration sensor -G200
2. Longitudinal acceleration sensor -G251

Use the Vehicle Diagnostic Tester

On display, select

1. Chassis
2. Brake System
3. 01 - On Board Diagnostic (OBD) capable systems
4. 03 - Brake electronics

Select the following functions on the display

1. Calibrate Transverse Acceleration Sensor -G200-.
2. Calibrate Longitudinal Acceleration Sensor -G251

Then perform the ESP driving and system test.

ELECTRONIC STABILIZATION PROGRAM BRACKET

The bracket for the ABS hydraulic unit -N55- and the ABS control module -J104- cannot be removed.

Roof Rack Recognition Sensor -G625

Applies to Hybrid Vehicles

Note. The sensor cannot be replaced by itself. It is part of the left roof railing. The roof rack recognition sensor -- is always installed in the left roof railing on both LHD and RHD vehicles.

Scheme 19

1. Adjustor on the Left Roof Railing
2. Roof Rack Recognition Sensor
3. Seals

Removing

Remove the left roof railing, refer to Removal and Installation .

Installing

Install the left roof railing, refer to Removal and Installation .

Steering Angle Sensor -G85

Applies to Hybrid Vehicles

The steering angle sensor -- is installed between the steering wheel and steering column switch.

Removing

Set the wheels to the straight ahead position.

Coil connector with slip ring -1-.

Scheme 20

Remove the airbag unit and steering wheel, refer to Removal and Installation .

Clipped onto the switch for turn signals, high/low beam headlamps and headlamp flasher.

Clipped to the coil ring with slip ring.

Remove the steering column switch module, refer to [For engine(s) CAEB, CALB] Removal and Installation .

Installing

Install in reverse order of removal.

Install the airbag unit and steering wheel, refer to Removal and Installation .

Calibrate the steering angle sensor --.

Use the vehicle diagnostic tester for this.

On the display, select

1. Chassis
2. Brake system (Repair group 01;45)
3. 01 - On Board Diagnostic (OBD) capable systems
4. 03 - ABS/ESP brake electronics

Select desired function on display.

1. ABS control module J104, ASR and ESP functions
2. Steering angle sensor -- calibration vehicle diagnostic tester.

Then perform the ESP driving and system test.

Right Front ABS Wheel Speed Sensor -G45- /Left Front ABS Wheel Speed Sensor -G47

Note. The sensor ring/rotor is installed in the respective wheel bearing unit and cannot be replaced.

Removing

Raise the vehicle.

Unlock and disconnect the connector -1- on speed sensor.

Scheme 21

Remove bolt -2-.

Remove speed sensor from wheel bearing housing.

Installing

Installation is the reverse of removal, with special attention to the following

Before inserting speed sensor, clean hole inner surface and coat speed sensor all-round with Polycarbamide grease G 000 650.

Turn the steering completely left and right after installation, making sure the speed sensor wiring has sufficient clearance.

Lower vehicle.

Right Rear ABS Wheel Speed Sensor -G44- /Left Rear ABS Wheel Speed Sensor -G46

Left rear illustration.

1. Right Rear ABS Wheel Speed Sensor -- /Left Rear ABS Wheel Speed Sensor
2. Hex Socket Head Bolt 9 Nm.

Note. The sensor ring/rotor is installed in the respective wheel bearing unit and cannot be replaced.

Removing

Raise the vehicle.

Unlock and disconnect the connector -1- on speed sensor.

Remove bolt -2-.

Remove speed sensor from wheel bearing housing.

Installing

Installation is the reverse of removal, with special attention to the following

Before inserting speed sensor, clean hole inner surface and coat speed sensor all-round with Polycarbamide grease G 000 650.

Lower vehicle.

SPECIAL TOOLS

Special tools and workshop equipment required

Scheme 22

Scheme 23

Scheme 24

1. Release Tool for Brake Light Switch T40168 A
2. Brake Pedal Actuator V.A.G 1869/2
3. Torque Wrench V.A.G 1410
4. Vehicle Diagnostic Tester VAS 5051 B or VAS 5052

See also:
• HIGH VOLTAGE VEHICLE GENERAL INFORMATION
• GENERAL INFORMATION
• HIGH AND LOW PRESSURE TESTING
• BRAKE PEDAL, WITH MANUAL TRANSMISSION
• BRAKE PEDAL, WITH AUTOMATIC TRANSMISSION
• [For engine(s) CAEB, CALB] Removal and Installation
• BRAKE SYSTEM, BLEEDING
• Center Console
• [For engine(s) CAEB, CALB] Removal and Installation
• Removal and Installation
• Removal and Installation
• Removal and Installation
• [For engine(s) CAEB, CALB] Removal and Installation
• Right Rear ABS Wheel Speed Sensor -G44- /Left Rear ABS Wheel Speed Sensor -G46
• ESP Sensor Unit -G419
• BRAKE LAMP SENSOR
• Right Front ABS Wheel Speed Sensor -G45- /Left Front ABS Wheel Speed Sensor -G47
• ABS Hydraulic Unit -N55- WITH ABS Control Module -J104
• Steering Angle Sensor -G85
• ASR/ESP SWITCH
• AUDI HOLD ASSIST
• AUDI HOLD ASSIST SWITCH
• ELECTRO-MECHANICAL PARKING BRAKE SWITCH
• Roof Rack Recognition Sensor -G625