First thing to do here is check the brake fluid is not contaminated with
say, p/s fluid for example. If the fluid in the master is oily or the seal
on the cover is wrinkled up, this is your problem.
> wrote in message
ps.com...
> Hi all,
>
> The short version is that my front brakes are dragging quite
> heavily. The long version is that I have a car with 4 wheel disc
> brakes and no ABS. Each caliper only has a single piston. My car has
> been parked through winter, so a few months and now the front brakes
> are dragging very heavily, to the tune of going 500 feet you cannot
> touch them. Needless to say the front brakes lock up instantly if you
> touch the brakes. The rears however appear to do nothing. I jacked up
> the rear and tried bleeding the brakes but there's absolutely no
> pressure or fluid coming out of the rear. My lines seem solid and I'm
> not low/losing fluid. Checking the front brakes this past weekend I
> found that the pads themselves were rusted to the track they're
> supposed to ride in, so I sanded them clean and lubricated them and
> they slide nice now, so should be able to release if that was the
> problem. But they still drag. Not quite as heavily now and the fronts
> don't lock up as easily.
>
> I've thought of stuck/failing calipers, but it's weird both in the
> front would fail at once, the brake fluid is clear with no debris, even
> coming out of each of the calipers on the front. So I would thinking
> combination/proportioning valve problem with the lack of rear pressure,
> but even at that there shouldn't be a constant slight pressure on the
> fronts. The vacuum boost assist seems to work well, but the overall
> pedal pressure is lower than I'd expect. My proportioning valve has a
> bleeder on it and bleeding this a half dozen to a dozen times you can
> get pressure to the rear for one pedal press. Perhaps there's air in
> the rear lines or break I'm missing? But I don't lose fluid and see no
> leaks, and it seems strange I have to bleed a dozen times to move the
> valve enough to get even a little pressure to the rears.
>
> The basic system is two lines off the master cylinder into the
> proporitioning valve, and then they each have splitters to feed
> left/right of rear or front.
>
> Any help would be appreciated, I'm not really sure what to try short of
> replacing the master cylinder and maybe the booster to be sure, but
> that's an expensive proposition, even a test to prove the master was
> bad would be useful.
>
> Thanks,
> Chris
>
>



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