Q: Brakes grab and lock up occasionally - 1990 Chevrolet G30
My van has a hydroboost system. Ocassionally, I have problems with the brakes that grab and lock up. I've noticed this at the front ones. The issue would improve if I let the van sit with the pressure bleeding out, but only for several days and then the problem would return. Also, I had the front brakes bled. The brakes wouldn't release right away when I opened the bleeders. When the problem occurs, there is no brake system warning light on. What might be the cause?
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