90 chev 4x4 WT1500, check brakes light is flashing all the time. Have
checked parking brake cables and pulled up on parking brake lever. Still
flashing. It has new shoes on the rear and new pads on the front and
master cylinder is full of fluid. The brakes are good. The only problem is
the light flashing is annoying. Both brake lights are working on the rear.
My brother's 1988 k1500 has ABS on the rear only - maybe the WT's didn't
come that way. As for the proportional valve - might be just that the
switch inside needs to be reset to the center position - often times
driving fairly slowly & SLAMMING EXTREMELY HARD on the brakes will do
the job. Might take several attempts.
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