I know this is an old thread but I am having a similar problem with my brakes. It seems they all lock up at different intervals, I just thought it was my front brakes but they all appear to "drag". Several months ago I replaced the brake booster because I had a very hard pedal, like there was no pressure. fixed the pedal but now I get dragging. replace a couple of calipers thinking it was them but was not, (they were old anyways)lol.. I checked the check valve and it seems to be working fine. I did not set the push rod to anything specific, (the booster I got was used) so I just installed it at the setting it was at.. so now I am at a loss and thinking that I should replace the bmc but I just don't want to just replace it if it not bad. I do not see any lines that are kinked or of issue so some better direction would be helpful. Thanks. this is on a 90 s13.
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