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ABS/EDL hydraulic unit, bleeding using Basic Setting (VAG 1551 function 04) Volkswagen Golf Mk3

Brake System On-Board Diagnostic (OBD) (A3 Platform) 39 illustrations ~948 words

ABS/EDL hydraulic unit, bleeding using Basic Setting (VAG 1551 function 04)

On vehicles with EDL, "Basic Setting" function 04 is used to bleed the ABS hydraulic unit. Use of the "Basic Setting" function for bleeding is only necessary when at least one brake fluid reservoir is completely empty (e.g. leaks in brake system).

WARNINGMake sure that filling/bleeding pressure does not exceed 1 bar (approx. 14-1/2 psi) when using a pressure bleeder. For this reason, operating pressure on some filler/bleeder units must be reduced to 1 bar. If the filling/bleeding pressure exceeds 1 bar, there is no guarantee that the ABS hydraulic unit is adequately bled. Connect brake system filler/bleeder unit. Connect VAG 1551 scan tool, switch ignition on, and select "Brake Electronics" address word 03. See VAG 1551 scan tool, connecting and selecting function .

Indicated on display

Scheme 110

Scheme 110
Scheme 110
  1. Press buttons -0- and -4- to select "Basic Setting" function 04.

Indicated on display

Scheme 111

Scheme 111
Scheme 111
  1. Press -Q- button to confirm input.

Indicated on display

Scheme 112

Scheme 112
Scheme 112
  1. Press buttons -0-, -0- and -1- to input display group 001, then press -Q- button to confirm input.

Indicated on display

Scheme 113

Scheme 113
Scheme 113
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 114

Scheme 114
Scheme 114
  1. Release brake pedal.
  2. Open left-front and right -front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 115

Scheme 115
Scheme 115
  1. ABS hydraulic pump runs

Indicated on display

Scheme 116

Scheme 116
Scheme 116
  1. Depress brake pedal 10 times, then close bleeder screws.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 117

Scheme 117
Scheme 117
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 118

Scheme 118
Scheme 118
  1. Release brake pedal.
  2. Open left-front and right -front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 119

Scheme 119
Scheme 119
  1. ABS hydraulic pump runs

Indicated on display

Scheme 120

Scheme 120
Scheme 120
  1. Depress brake pedal 10 times.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 121

Scheme 121
Scheme 121
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 122

Scheme 122
Scheme 122
  1. Release brake pedal.
  2. Open left-front and right -front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 123

Scheme 123
Scheme 123
  1. ABS hydraulic pump runs

Indicated on display

Scheme 124

Scheme 124
Scheme 124
  1. Depress brake pedal 10 times.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 125

Scheme 125
Scheme 125
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 126

Scheme 126
Scheme 126
  1. Release brake pedal.
  2. Open left-front and right-front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 127

Scheme 127
Scheme 127
  1. ABS hydraulic pump runs

Indicated on display

Scheme 128

Scheme 128
Scheme 128
  1. Depress brake pedal 10 times.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 129

Scheme 129
Scheme 129
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 130

Scheme 130
Scheme 130
  1. Release brake pedal.
  2. Open left-front and right -front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 131

Scheme 131
Scheme 131
  1. ABS hydraulic pump runs

Indicated on display

Scheme 132

Scheme 132
Scheme 132
  1. Depress brake pedal 10 times.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 133

Scheme 133
Scheme 133
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 134

Scheme 134
Scheme 134
  1. Release brake pedal.
  2. Open left-front and right-front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 135

Scheme 135
Scheme 135
  1. ABS hydraulic pump runs

Indicated on display

Scheme 136

Scheme 136
Scheme 136
  1. Depress brake pedal 10 times.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 137

Scheme 137
Scheme 137
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 138

Scheme 138
Scheme 138
  1. Release brake pedal.
  2. Open left-front and right-front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 139

Scheme 139
Scheme 139
  1. ABS hydraulic pump runs

Indicated on display

Scheme 140

Scheme 140
Scheme 140
  1. Depress brake pedal 10 times.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 141

Scheme 141
Scheme 141
  1. Depress brake pedal with substantial foot pressure, and hold. Pedal moves down ABS hydraulic pump runs Pedal comes back up

Indicated on display

Scheme 142

Scheme 142
Scheme 142
  1. Release brake pedal.
  2. Open left-front and right-front bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 143

Scheme 143
Scheme 143
  1. ABS hydraulic pump runs

Indicated on display

Scheme 144

Scheme 144
Scheme 144
  1. Depress brake pedal 10 times.
  2. Close bleeder screws.
  3. Press -3- button.

Indicated on display

Scheme 145

Scheme 145
Scheme 145
  1. Press -> button.

Indicated on display

Scheme 146

Scheme 146
Scheme 146
  1. Press buttons -0- and -6- to select "End Output" function 06.

Indicated on display

Scheme 147

Scheme 147
Scheme 147
  1. Press -Q- button to confirm input.

Indicated on display

Scheme 148

Scheme 148
Scheme 148
  1. Press -C- button.
  2. Switch ignition off.
  3. Disconnect VAG 1551 scan tool.
  4. Bleed brake hydraulic system. See «BRAKE SYSTEM, BLEEDING»(ref-203060-S26769553492005103000000) .

Location: bolted to ABS hydraulic unit, left side of engine compartment

CAUTIONDetermine correct radio anti-theft coding before disconnecting the battery.
  1. Disconnect battery.
  2. Remove coolant expansion tank and swing to one side.
  3. Disconnect harness connector from ABS control module.
  4. Connect bleeder bottle with bleeder hose to left -front brake caliper bleeder screw and open bleeder screw.
  5. Depress brake pedal at least 60 mm (2-3/8 in.).
  6. Install brake pedal loading device from VAG 1238 B.
  7. Close front left bleeder screw.
  8. Remove heat shield from tandem master brake cylinder.
  9. Disconnect brake lines from brake master cylinder and ABS hydraulic unit and seal brake lines and threaded holes with plugs from repair kit Part No. 1H0 698 311 A.
  1. Remove Torx socket-head bolts (T25) on ABS hydraulic unit mounting bracket.
  2. Remove ABS hydraulic unit.
  3. Pull ABS hydraulic pump motor harness connector off ABS control module.
  4. Remove bolts from ABS control module and pull control module off. Do not tilt ABS control module when pulling off.
  5. Cover control module solenoids with a lint-free cloth.

After separating the ABS control module and ABS hydraulic unit, protect the valve dome.

CAUTIONOnly remove the sealing plugs on the ABS hydraulic unit just before the particular brake line is to be installed. If the sealing plugs are removed too soon, brake fluid can escape and it can then no longer be guaranteed that the unit is sufficiently filled or adequately bled. There must not be anything in the area of the ABS control module that can contaminate the valve block.
  1. Bolt ABS control module to ABS hydraulic unit. Maximum tightening torque: 4 N.m (35 in lb)
  2. Connect ABS hydraulic pump motor harness connector.

The remainder of the installation is the reverse of the removal sequence.

Bleeding brake system

See BRAKE SYSTEM, BLEEDING .

Coding ABS control module. See CODE CONTROL MODULE (VAG 1551 FUNCTION 07) .