| Notes for repair work 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 as well as the control unit code using „Guided Fault Finding“. |
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| With ignition switched off, disconnect battery earth strap. |
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| When working with brake fluid, observe the 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 equipment -VAS 5234- or -V.A.G 1869- → Chapter. |
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| During the final road test, ensure that at least one ABS-controlled braking operation takes place (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 the connections and the surrounding areas before separating, but do not use strong abrasive cleaning products such as brake cleaner, petrol, solvents or similar products. |
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| Place removed parts on a clean surface and cover. |
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| After separating control unit from hydraulic unit, use transport protection for contact pins. |
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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 remove replacement parts from packaging immediately prior to installation. |
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| Only use replacement parts which come 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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| 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). |
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| Ensure that no brake fluid enters electrical connectors. |
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