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Old 10-14-2014, 12:01 AM
Schurkey Schurkey is offline
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Re: '89 C2500 rear brakes lock up

A proportioning valve does not activate until the pressure is quite high. Therefore, no proportioning valve action at typical mild- to medium-braking.

There's nothing in the master cylinder that can provide excess pressure to the rear brakes.

Might be that the front brakes are somehow weak, leading to over-use of the rears.
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