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1997 993 C4S ABD and Anti-lock warning lights

Electrical and Electronic

Vehicle Information: Model: 993 C4S; Year: 1997; Body Type: Coupe; Total Mileage: 37800;

Joel,On several occasions, the ABD and anti-lock warning lights came on while driving. The first time was at low speed when lightly applying the brakes. After restarting the car, it ran without incident for several days. The second time the warnings came on at about 4K rpm without applying the brakes. Upon restarting, the lights came on again at about 4K, without using the brakes. It has now become a common occurence at the higher rpms. There is no apparent diminution of braking power, although I have not tried to engage the anti-lock feature. The brake fluid was changed 2,000 miles ago and the weather has always been dry and relatively warm. There was no warning on startup that the braking pressure was low. Any ideas on where to start looking to resolve this problem would be appreciated. Ron

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