Volkswagen Golf Service & Repair Manual: Removing and installing control unit and hydraulic unit, LHD
| 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 of the engine compartment. |
| Do not bend the brake lines in the area of the hydraulic
unit! |
| – |
Read out and note the existing control unit code. |
| – |
If vehicle has a coded radio, note radio code or, if
necessary, request it. |
| – |
Observe safety precautions when working on the high-voltage
system
→ Chapter. |
| – |
Observe the risk classification of the high-voltage system
→ Electric drive; Rep. gr.00. |
| – |
Disconnect battery
→ Electrical system; Rep. gr.27. |
| – |
Remove catalytic converter
→ Rep. gr.26. |
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Remove heat shield -1- if
present. |
| – |
To do this, unclip heat shield -1-
from bracket -2--arrow-. |
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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 electrical connector -1-. |
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Apply brake pedal depressor -V.A.G 1869/2-. |
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| – |
Connect hose of bleeder bottle -1-
to bleeder valve of front left brake caliper. |
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| – |
Connect hose of bleeder bottle -1-
to bleeder valve of rear left brake caliper. |
| – |
Depress brake pedal at least 60 mm using brake pedal
depressor -V.A.G 1869/2-. |
| – |
Close front left and rear left bleeder valves. |
| – |
Do not remove brake pedal depressor -V.A.G 1869/2-. |
 Note
| Ensure no brake fluid gets onto contacts. |
| – |
Pull cover off bulkhead and unclip brake lines. |
| – |
First identify both brake lines from brake master cylinder
and unscrew from hydraulic unit. |
| – |
Seal threaded holes immediately using sealing plugs from the
assembly part kit, part no. 5Q0 698 311. |
| – |
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. Note the following points: |
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 rubber
dampers are not pressed out of bracket. |
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| Tightening sequence of brake lines: |
| – |
Remove brake pedal depressor -V.A.G 1869/2-. |
| – |
Bleed brake system
→ Chapter. |
| – |
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 bleeder valves
→ Chapter „Assembly overview - front brake caliper“ |
| Rear bleeder valves
→ Chapter „Assembly overview - rear brake caliper“ |
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1 -
Brake servo and brake master cylinder
Assembly overview
→ Chapter.
Checking brake servo → Vehicle
diagnos ...
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- ...
Other materials:
Removing and installing rear centre console vent duct
Note
The illustration shows a left-hand drive vehicle.
Removing
–
Remove centre console
→ General body repairs, interior; Rep. gr.68.
Note
If t ...
Repairs to CAN bus wiring
An unshielded two-wire line -1-
and -2- with a cross section of
0.35 mm2 or 0.5 mm2
is used for CAN bus wiring.
The colour codes of the CAN bus wiring can be gleaned from
the following table:
...
Introduction
This chapter contains information on the following subjects:
→ Displays, warning and indicator lamps
→ Radar sensor
→ Operating Adaptive Cruise Control (ACC)
→ Switch off the Adaptive Cruise Control (ACC) temporarily in the following
situations ...
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Assembly overview - control unit and hydraulic unit, RHD vehicles
Removing and installing control unit and hydraulic unit, RHD vehicles