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General information on the anti-lock brake system
Notes for repair work on the ABS
Important
The anti-lock brake system is basically maintenance free.
Testing, removing, installing and repair work may only be performed by qualified personnel.
Failure to observe the points described in this Workshop Manual may result in damage to the system and could make the vehicle unsafe.
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◆ Before carrying out repair work on the anti-lock brake system, determine the cause of the problem with the aid of the self-diagnosis.
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◆ When installing a new hydraulic control unit, always check its coding.
=> Running Gear Self-Diagnosis; Repair group 01
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◆ Switch off the ignition before removing and installing components. If the vehicle is equipped with a coded radio, obtain the security code before disconnecting the earthing strap of the battery.
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◆ Observe the relevant safety precautions and information when handling brake fluid.
=> Special Information; Running Gear No. 21
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◆ If hydraulic system has to be opened, bleed the braking system after the work is finished (e.g. with V.A.G 1869) => Repair group 47. In addition, a high- and low-pressure test should be carried out on the brake system
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◆ During the concluding road test, ensure that an ABS-controlled brake application is carried out at least once (can be felt from the pulsing of the brake pedal).
=> Running Gear Self-Diagnosis; Repair group 01
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◆ Absolute cleanliness is required when working on the anti lock brake system, and it is not permitted to use any products which contain mineral oil, such as oil, grease etc.
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◆ Thoroughly clean all unions and the adjacent areas before undoing them, but do not use aggressive cleaning agents such as brake cleaner, petrol, thinners or similar.
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◆ Place removed parts on a clean surface and cover.
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◆ Carefully cover or seal open components if repairs cannot be carried out immediately. (Use plugs, repair set H0 698 311 A)
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◆ Only use lint-free cloths.
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◆ Do not remove replacement parts from their wrapping until you are ready to install them.
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◆ Only use genuine parts in their original packaging.
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◆ When the system is open do not work with compressed air and do not move the vehicle.
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◆ Ensure that no brake fluid enters plug connectors.
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◆ When carrying out spray painting work, the electronic control unit may be exposed for short periods to a maximum temperature of 95°Cand for longer periods (about 2 hours) to a maximum temperature of 85°C.
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◆ Before carrying out welding work with electric welding equipment
=> General Notes; General Body Assembly; Safety precautions
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