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Sierra rear caliper question
SteveWallace - 6/6/13 at 05:27 PM

I've just been putting new pads in my Sierra rear calipers and have wound the pistons back in to make room. My new pads have a small bump on the back of them that fits perfectly into one of the holes that you use to locate the wind back tool.

Obviously for this to be correct, when the piston is in use it would need to come straight out rather than wind out otherwise it would eventually jam against the bump as it turns. Its an easy fix if I need to do it (just grind the bump off), However, if the piston does come out in a straight line then the bump is useful as it will help to prevent judder, so I don't want to take it off unless I have to.

Does anyone know whether the piston comes straight out or does it wind out in normal use, i.e. rotating in the opposite direction to the way that you manually wind it in?

britishtrident - 6/6/13 at 05:36 PM

The end of the piston doesn’t turn relative to the pad. The internal part of the piston turns relative to the outer part to take up wear.

SteveWallace - 6/6/13 at 05:38 PM

Thanks, thats what I was hoping - I don't need to take them to bits again now.

big-vee-twin - 6/6/13 at 06:36 PM

Don't forget to pump the pedal 10-12 times to /wind the adjuster out before applying handbrake for first time.

mcerd1 - 7/6/13 at 10:53 AM

quote:
Originally posted by SteveWallace
My new pads have a small bump on the back of them that fits perfectly into one of the holes that you use to locate the wind back tool......
Obviously for this to be correct, when the piston is in use it would need to come straight out rather than wind out otherwise it would eventually jam against the bump as it turns.


I think that it actually needs the bump on the back of the pad to make sure it doesn't turn - otherwise I don't think the adjuster works