Notes for repair work on anti-locking brake system — VW
Notes for repair work on anti-locking brake system on VW: factory workshop procedure. Full factory text, tools and checks.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 Procedure
VW
Polo Classic
2002
Running gear
Brake systems
Edition
11.2007
Notes for repair work on anti-locking brake system
Before carrying out repair work on the anti-lock brake system, determine the cause of the fault using
“guided fault finding”
.
“Guided fault finding”
is carried out on the
vehicle diagnosis, testing and information system
VAS 5051
.
Disconnect battery earth strap with ignition switched off.
Before carrying out welding work with an electric welding unit, note
General Information; Body Repairs, General Body Repairs
.
When working with brake fluid, observe the valid, relevant safety precautions and notes
Chapter
.
After work for which the brake system had to be opened, bleed the brake system with
brake filling and bleeding equipment
VAS 5234
or
V.A.G 1869
,
Chapter
.
During a concluding road test, ensure that a regulated brake test takes place at least once (pulsations must be felt at the brake pedal).
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.
Thoroughly clean all unions and the adjacent areas before loosening, do not use aggressive cleaning agents such as brake cleanser, petrol, thinners or similar.
Place removed parts on a clean surface and cover.
After separating the control unit/hydraulic unit use the transportation protection for the valve contact pin.
Carefully cover or seal open components if repairs cannot be carried out immediately. (Use sealing plugs from repair kit 1 H0 698 311 A).
Only use lint-free cloths.
Only unpack replacement parts immediately prior to fitting.
Only use genuine packed parts.
When the system is open do not work with compressed air and do not move the vehicle.
During painting operations, the electronic control unit can be exposed to a maximum temperature of 95 °C for only a short period, and to a maximum of 85 °C for longer periods (approx. 2 hours). Ensure that no brake fluid enters electrical connections.
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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.