Rear brakes hanging up.

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Joined
May 15, 2011
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Location
PA
My Car
1971 Mach 1 Mustang
My rear brakes were hanging up a bit today. It’s happened a few times over the last year but once I let it sit for a little while it’s fine again. Seems like if I brake harder than normal the rear brakes don’t release completely and take time for the pressure to bleed off. I have the stock manual drum brake master cylinder but I am running disc brakes at all 4 corners. I have had this same set up for close to 10 years with no problems. Does the stock drum brake master cylinder have a check valve that could be sticking and holding line pressure on my rear brakes?

I have all the parts needed to install power disc brake master cylinder. All sitting in the garage ready to go. Looks like I will be doing that swap in near future. I have all new cross drilled and slotted rotors, pads, hoses, lines, rebuilt booster and master, all ready to go. I’m hoping that will take care of my issue.

 
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