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Post by chris on Mar 14, 2014 11:47:12 GMT
Hello again,
I'm wanting to clean up the rear brake pistons and replace the seals, i've heard there is an o-ring in between the calliper yet there seems to be no record of it in the manual or on the web, does this mysterious o-ring exist? Has anyone seen it?
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Post by m40man on Mar 14, 2014 12:29:05 GMT
Yes there is. Not normally encountered, because you don't normally actually split the caliper when servicing it, just pop the pistons out, clean or replace the seals & so on, which doesn't call for a split. If you do decide to split, you will prob need to hold one half in a good vice to allow you to apply enough pressure to the bolts to undo them. Wrap it to protect it against marking by the vice. But unless you have specific need, I'd not bother splitting - nothing much to gain by it (except maybe loosing the o-ring  ). |
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Post by chris on Mar 14, 2014 12:43:09 GMT
Thanks m40man i'll try popping them out it just didn't look like there was enough room to do that  ? |
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Post by max900 on Mar 15, 2014 11:03:18 GMT
Thanks m40man i'll try popping them out it just didn't look like there was enough room to do that ? there is enough room but only for 1 piston at a time  |
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Post by CD on Mar 19, 2014 12:06:14 GMT
I do all my calipers one piston at a time. That way, it's easier to get them out with compressed air or even a cycle tyre pump.
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Post by johbay on Mar 27, 2014 11:40:05 GMT
Do you mind stepping me through rear brake caliper service . A few tips that the workshop manual misses wpuld be great. Replacing pads, compressing pistons
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Post by max900 on Mar 28, 2014 22:17:19 GMT
Do you mind stepping me through rear brake caliper service . A few tips that the workshop manual misses wpuld be great. Replacing pads, compressing pistons Remove caliper from bike remove r-clips from pad retaining pins remove pad retaining pins gently apply pressure to brake pedal to push pistons out a bit but not to far(also watch the pistons to see if one isnt moving) use break cleaner sprayed onto piston then use a tooth brush(preferably one not still in use for teeth cleaning) to scrub away the gunk built up around the piston---repeat for other piston then push pistons back into the caliper and give the inside face of the caliper a good clean then slide pads back in and replace pins and r-clips put caliper back on bike secure bolts and press brake pedal till pads are back in contact with disc  |
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Post by neilmud Lord Protector on Mar 29, 2014 1:07:28 GMT
Thats what I do Neil |
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Post by CD on Apr 10, 2014 8:38:55 GMT
If one piston is reluctant to move it's likely that corrosion has built up in the seal groove.
So if cleaning as suggested does not give a properly smooth action bit the bullet and strip the caliper.
Done as a routine job it's MUCH easier to get it apart and you can usually reuse the old seals.
Do it when the brake is beginning to bind will usually need new seals but the job is easy enough.
Leave it until the brakes binding for sure and you will need new seals and it will be a booger to strip.
The seal grooves must be fully scraped clean and red greased before new seals are fitted.
With multi piston calipers you need a clamp to hold one piston while the opposite on is pushed out. I use two strips of steel with long bolts to make a simple clamp. If it's a four pot caliper use a block of wood between the other piston pair.
The easiest method to extract the pistons is compressed air. I use a bicycle styrup pump and a ball/air bed inflator attachment into the bleed nipple threads with a short bolt and washer to plug the banjo thread. If that's not forceful enough, you can use the hydraulics though it's messy and time consuming.
Sent from my phone with mangled spelling
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