Check fluid levels and if that is not the culprit then check sensors by unplugging them and using a voltmeter attach the leads to the wire ends and rotate tires and if voltage is supplied than the sensor is ok
I don't believe ABS was an option in 1988, is your vehicle an 1998? If so I've replaced many wiring harneses from the hub to the frame, even further on some to solve the problem. I work at a GM dealership so we have the connectors and make them myself.
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2003 avalanche,abs and brake light are constant, drove to work and the motor on the abs unit stays on even with the key off .Had to disconnect fuse to the unit, so my battery wn't die. check lining,wash the brakes and still cant stop the motor from running.My next step would be to replace hubs with sensors, flush the system. Or trade it for a non american car.
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