| Notes for repairs on anti-lock brake system |
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| 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-. |
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| Before working on the anti-lock brake system, disconnect the battery earth strap. Obtain radio code on vehicles with coded radio. |
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| When working with brake fluid, observe the valid, relevant safety precautions and notes → Chapter. |
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| After work for which the brake system had to be opened, bleed the brake system with brake filling and bleeding unit -VAS 5234- or -V.A.G 1869- → Chapter. |
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| During a concluding road test, ensure that a regulated brake test takes place at least once (pulsations must be felt at the brake pedal). |
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| 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. |
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| Thoroughly clean all connections and the adjacent areas before loosening; do not use harsh cleaning agents such as brake cleaner, fuel, thinners or similar. |
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| Place removed parts on a clean surface and cover them up. |
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| After separating the control unit/hydraulic unit use the transportation protection for the valve contact pin. |
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| If repairs cannot be carried out immediately, carefully cover or seal open components. (Use sealing plugs from repair kit 1 H0 698 311 A). |
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| Only use lint-free cloths. |
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| Only unpack replacement parts immediately prior to fitting. |
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| Only use genuine packed parts. |
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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 electrical connections. |
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