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Old 06-12-2017, 11:00 AM   #11
SLIM
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So far, Aaron, the new proportioning valve totally corrected my occasional front brake drag issue. I'm amazed at the difference between the proportioning valve that came with my packaged CPP booster/master/prop valve assembly purchased last year and the replacement prop valve CPP sent me earlier this year. Both prop valves are chrome, but the replacement is much heavier than the original. I suspect the original was aluminum and the replacement is brass, the way it should be. Also, the replacement no longer has a rubber boot in the front like the leaking original.

I hope I did get the correct proportioning valve for 4WDB.

The one with the black rubber cap in front was for disc/drum, the disc/disc has no rubber in the front. I bet it was your rear brakes that were dragging due to wrong prop valve that had a residual pressure valve built in for drum brakes.
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Old 06-12-2017, 11:28 AM   #12
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The one with the black rubber cap in front was for disc/drum, the disc/disc has no rubber in the front. I bet it was your rear brakes that were dragging due to wrong prop valve that had a residual pressure valve built in for drum brakes.
NO! Read my post. The front brakes dragged occasionally. At CPP's request I loosened the front master cylinder to prop valve line when front brakes were dragging which immediately released unwanted front brake line pressure. New prop valve solved the problem. It worked fine for a few months before I started having the front brake dragging problem.

Old prop valve had residual pressure valve removed and worked fine.
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