Volkswagen Golf Service & Repair Manual: Removing and installing control unit and hydraulic unit, LHD vehicles,
petrol engines
| Special tools and workshop equipment required |
| Torque wrench -V.A.G 1331- |
| Torque wrench -V.A.G 1410- |
| Brake pedal depressor -V.A.G 1869/2- |
| Sealing plugs, assembly part no. 5Q0 698 311 |
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| The control unit is bolted to the hydraulic unit and is
located on right in the engine compartment. |
Risk of damage to brake lines if bent.Never excessively bend the brake
lines in the area of the hydraulic unit.
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Read out and note the existing control unit code. |
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If vehicle has a coded radio, note radio code or, if
necessary, request it. |
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Disconnect battery
→ Electrical system; Rep. gr.27 |
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In vehicles with heat shield, remove heat shield. |
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Press down retainer catch -arrow A-. |
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Release electrical connector -arrow B-.
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Pull off connector -1-.
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Apply brake pedal depressor -V.A.G 1869/2-. |
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Connect hose of bleed bottle -1-
to bleeder valve of front left brake caliper. |
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Connect hose of bleed bottle -1-
to bleeder valve of rear left brake caliper. |
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Depress brake pedal at least 60 mm using brake pedal
depressor -V.A.G 1869/2-. |
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Close front left and rear left bleeder valves. |
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Do not remove brake pedal depressor -V.A.G 1869/2-. |
 Note
| Ensure no brake fluid gets onto contacts. |
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Pull cover off plenum chamber bulkhead and unclip brake
lines. |
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First identify both brake lines from brake master cylinder
and unscrew from hydraulic unit. |
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Seal threaded holes immediately using sealing plugs from the
assembly part kit with part no. 5Q0 698 311. |
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Mark, unscrew and seal threaded holes of remaining brake
lines (brake calipers). |
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Pull hydraulic unit together with control unit upwards out
of dampers -arrow-. |
| Install in reverse order of removal, observing the
following: |
Note
| Remove sealing plugs from new hydraulic unit only when the
corresponding brake line is to be fitted. |
| If sealing plugs are removed too early from the hydraulic
unit, brake fluid can escape, and it can then no longer be
guaranteed that the unit can be sufficiently filled and bled. |
| When installing the hydraulic unit, ensure that the rubber
dampers are not pressed out of bracket. |
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| Tightening sequence of brake lines: |
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Remove brake pedal depressor -V.A.G 1869/2-. |
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Bleed brake system
→ Chapter. |
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Code control unit -J104- using → Vehicle
diagnostic tester in "Guided Fault Finding". |
| To do this, carry out basic setting of the steering angle
sender -G85-, the lateral acceleration sender -G200-, the
longitudinal acceleration sender -G251- and the brake pressure
sender -G201-. |
| → Chapter „Assembly overview - control unit and hydraulic unit,
LHD vehicles“ |
| Battery
→ Electrical system; Rep. gr.27 |
| Front bleed valves
→ Chapter „Assembly overview - front brake caliper“ |
| Rear bleeder valves
→ Chapter „Assembly overview - rear brake caliper“ |
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1 -
Brake line
From secondary piston circuit of brake master cylinder to hydraulic
unit.
Identification: 6 mm in diameter and unio ...
Special tools and workshop equipment required
Torque wrench -V.A.G 1331-
Torque wrench -V.A.G 1410-
Brake pedal depressor -V.A.G 1869/2- ...
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