ReSTored
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Have a question and need advise.
Had marginal brakes end of season 2013 and after winter break in March 2014 removed caliper, thoroughly cleaned seal grooves, pistons, put in new seals, cleaned and lubed caliper pins, new fluid, bled and brakes seemed to work fine. In March 2015 I removed pads, cleaned and cleaned pistons without removing them and they were working fine. Attended OHSTOC a few weeks ago and halfway through brakes became marginal again, minimal stopping power, would not lock when aggressively applied to test. Upon arriving home found innermost pad worn 99% (luckily not 100% and metal to metal on the disk) and other pad worn about 50%. I've ordered new pads, seals and pistons. Intend to remove caliper, clean thoroughly again and re-install with new seals, pistons and pads.
Questions
- I'm not certain is this is a stuck piston or caliper issue. Since the pads had worn unevenly I'm trending toward a caliper problem meaning the caliper pins seized up and caused pad drag on the disk. Does this make sense?
- How much effort should be required to push in the pistons once they been cleaned or replaced. Is there some way or quantifying this so I know they are moving freely?
- Any other suggestions or advise? What am I missing here as I thought this had been addressed in March 2014 & 2015 with routine maintenance.
Had marginal brakes end of season 2013 and after winter break in March 2014 removed caliper, thoroughly cleaned seal grooves, pistons, put in new seals, cleaned and lubed caliper pins, new fluid, bled and brakes seemed to work fine. In March 2015 I removed pads, cleaned and cleaned pistons without removing them and they were working fine. Attended OHSTOC a few weeks ago and halfway through brakes became marginal again, minimal stopping power, would not lock when aggressively applied to test. Upon arriving home found innermost pad worn 99% (luckily not 100% and metal to metal on the disk) and other pad worn about 50%. I've ordered new pads, seals and pistons. Intend to remove caliper, clean thoroughly again and re-install with new seals, pistons and pads.
Questions
- I'm not certain is this is a stuck piston or caliper issue. Since the pads had worn unevenly I'm trending toward a caliper problem meaning the caliper pins seized up and caused pad drag on the disk. Does this make sense?
- How much effort should be required to push in the pistons once they been cleaned or replaced. Is there some way or quantifying this so I know they are moving freely?
- Any other suggestions or advise? What am I missing here as I thought this had been addressed in March 2014 & 2015 with routine maintenance.