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you had better check that out thoroughly, it isn't normal for that to happen.

Front and rears should be drum brakes, and theres really no valve to malfunction.

My first thought is that the cylinders have overextended and cocked sideways locking the shoes against the drum, this could happen if the shoes were extremely worn out, or the assembly was put together wrong.

Second thing to check isn't even the brakes, your front axle may be locked.

The next time the front brakes are locked up, open one of the brake bleeders up front. If the pressure releases you have a restriction in the hydraulic system such as a pinched brake line or a collapsed brake hose. If you open the front bleeders and the front brakes are still locked up and they are disc brakes, you may have stuck/frozen brake calipers or stuck caliper slide pins.

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Q: Why wont the front brakes release on my 1978 Jeep cj5?
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