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Home >> Porsche >> 1990 >> 928 Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Operation >> Warning System

Warning System

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A diode is installed between terminals No. 4 and 7 of hydraulic unit connection. If electrical system of ABS control unit has a problem or control unit plug is disconnected, terminal No. 29 will become ground. This will cause problem to go on. If solenoid valve relay is malfunctioning, the indicator/warning lights will also be switched on.