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Why do frozen caliper slide pins cause soft brake pedal 700

posted by  interstition on  Sun Apr 23 08:06 CST 2006
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last visit: Mon Apr 28 10:13 CST 2014
[RELATED]

For the second time, I have made a formerly soft brake pedal firm in a 740 by doing a front brake pad job and in the process, freeing up frozen caliper slide pins. In both cases, the inner pads were worn out while outers still had quite a bit left, indicating that only the side with the piston was bing pressed agains the rotor. I did open the bleeder to push the calipers back, but one of the these cars I had previously bled all four wheels in the right order without making any improvement in pedal feel. So I can't attribute this to inadvertantly removing air that had been in the sustem.

So my question is why do frozen sliders make the pedal feel soft? I have seen it posted here that it can and have veified it, but I don't understand it. My limited understanding of hydraulics says the as long as all of the pistons are "pushing back" and there is no air and no leaks in the system, then the pedal should be firm.
--
Andy in St. Paul - '91 745 218K mi, '91 745 210K, '90 744 183K, all Rex-Regina - past 240s






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