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Orange · 07-25-2007, 08:26 AM

Knee-jerk answer would be wrong prop. valve.

Disc/Drum proportioning valve on the disc/disc setup would cause that because the drum brakes require residual pressure, and the disc/drum prop valves provide that. So if he didn't change it, then the rear discs are holding line pressure.

You should also check the rubber lines on the rear.

DLB

07-25-2007, 08:26 AM	#2
Orange Licensed to Thrill! Join Date: Apr 2006 Location: Northwest, GA Posts: 1,673	Re: Disk brake conversion Knee-jerk answer would be wrong prop. valve. Disc/Drum proportioning valve on the disc/disc setup would cause that because the drum brakes require residual pressure, and the disc/drum prop valves provide that. So if he didn't change it, then the rear discs are holding line pressure. You should also check the rubber lines on the rear. DLB __________________ 1971 GMC.Lowered. Overdrive. Orange. Krue's excellent FAQ Index.