| Indications regarding repairs to the anti-lock brake system (ABS) |
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| Before repairing the anti-lock brake system, investigate the reason for the fault using the vehicle diagnostic, measuring and information system -VAS 505X- and the “Guided fault finding” function. |
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| Disconnect battery earth cable only with ignition switched off. On vehicles with coded radio, obtain and observe the anti-theft coding. |
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| After disconnecting, the following work is necessary depending on the vehicle equipment: Code radio, set clock, synchronise power window motors. |
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| Before soldering with an electric soldering gun, observe the following safety precautions → Bodywork - repair. |
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| When handling brake fluid, observe safety precautions and current regulations, → Chapter. |
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| Always bleed the brake system with the Brake bleeder -SAT 1175B- after conducting work involving opening the brake system → Chapter. |
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| During the test drive make sure that the at least one braking action activates the ABS system (pulsations should be felt in the brake pedal). |
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| Work on the ABS system demands the highest levels of cleanliness; under no circumstances should auxiliary materials that contain mineral oils be used, such as oil, grease 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 parts that have been removed on a clean base and cover them over. |
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| After having separated the control unit from the hydraulic unit, use transport protection for the valve stems. |
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| Cover or plug the open parts carefully if the repair is not going to be carried out immediately (use the repair plugs → Parts catalogue). |
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| Only take spares out of their packaging just before assembly. |
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| Only use replacement parts which come in their original packaging. |
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| If the system is open, do not use compressed air and do not move vehicle. |
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| Make sure that brake fluid does not enter the connectors. |
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