I know I have read many of you were/are mustang enthusiests as well. I have an 89 mustang gt that i swapped the rear from drum to disc brakes. The rear brakes seem to constantly be dragging. I have googled to try and find if anyone else had the same issue. I bought new booster new master cylinder and the brakes seem to work fine. except they constantly drag on the rear. I have and adjustable proportioning valve in place. I believe that i need a residual pressure valve to stop this? anyone have any knowledge on this issue? I have asked on the mustang forum but the people/site sponsors dont give out knowledge for the do it yourself guy.
What year/model mustang did you get the rear disc setup from? I have a '93 Cobra that already came with disc brakes, but once it hit 10's in the 1/4 I put '03 brakes on all four corners, and for some reason they were dragging in the rear as well. I had to remove the power brake pump and put a manual one in and it unlocked the rears.
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I believe they are the 93 cobra rear disc.. But its been 3 years since i purchased everything and a year and a half since I installed. I don't drive it much and they don't drag to badly but Im thinking of putting a blower on it and want to fix all of the small issues first
When you converted the rears to disc, did you change out the master cylinder to a 93 cobra unit? The stock master cylinder is setup for drum rears, and has a smaller overall bore, as well as a smaller outlet to the rear brakes.
That's odd man that you have any dragging on a stock '93 setup. Like I said I had to switch to a manual pump, but that was because I put on parts that were 2 generations later. Stangslayer makes the valid point, but if you have all that then it doesn't make sense besides maybe the system wasn't bled enough, or the calipers are just shot and not opening up all the way.
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