brakes lock after a few miles pedal gets hard.can drive after cool down on 1991 Chevrolet Astro

every stop increases problem

by in Las Vegas, NV on December 20, 2013
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2 answers
ANSWER by , December 20, 2013
Most likely the brake booster is your trouble! Next time this happens, pull the vacuum check valve out of the booster then put it back in place, now try to move van, brakes free and not locked now? Get some help if unsure how to do this. Do NOT drive with check valve removed from booster!!
ANSWER by , April 06, 2016
The rubber brake lines from body to brake cylinders will detereriate on the inside and block fluid flow. If you can determine which wheel you can have it checked. You may need to change this hose. Usually the wheel will be hot after driving.