1990 Chevrolet Silverado Repair Question
Brake Question -- 1990 K3500 Dually
These are hydraulic assist brakes that came in these things.
Brakes are new this summer, front calipers are new also. Issue was present before replacement. There are no liquids on the drums or pads. Bled the front brakes.
There is a ABS control module and ABS Hydraulic Unit, I don't know if there is a proportioning valve in this or not.
Any help on ideas on what this could be would be great.
That really sounds like brake contamination. You don't have to actually see any liquid. Even very small amounts will embed into the shoes along with brake dust and ruin the shoes and the drum surface. If the shoes look dark in color at all, then they are likely contaminated. Look at the backing plate carefully for any apparent dark spots to indicate oil residue from either the brake fluid in the wheel cylinders or gear oil from the differential seals.
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