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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
every stop increases problem
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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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!!
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.
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