Urgent rear piston advice needed
02-23-2019, 08:43 AM
#1
Urgent rear piston advice needed
in the middle of rebuilding the rear callipers - and for the life of me can’t get the top piston seal seated.
Anyone got any tips?
thanks
Anyone got any tips?
thanks
02-23-2019, 11:49 AM
#3
Seat dust cover onto caliper and then make up what I can only describe as mini bungi cords out of string and little hooks..use these to pull the mouth of the dust boot out wider..about 5 little strings and hooks should do.Red grease the piston and slowly insert into dust cover untill seated.
Remove strings and hooks.
Remove strings and hooks.
02-23-2019, 12:59 PM
#4
Seat dust cover onto caliper and then make up what I can only describe as mini bungi cords out of string and little hooks..use these to pull the mouth of the dust boot out wider..about 5 little strings and hooks should do.Red grease the piston and slowly insert into dust cover untill seated.
Remove strings and hooks.
Remove strings and hooks.
02-23-2019, 02:04 PM
#5
everyone says they are a bitch so i've always outsourced 
nothing on youtube?
nothing on youtube?
02-23-2019, 11:34 PM
#6
^^^ this. Save yourself the aggro and get them refurbed by someone else.
02-24-2019, 12:47 AM
#7
I know how you feel, when you’re into the job and you just wanna finish it, but I’d really second what Unclefester says and outsource.
I will do almost any job on the S2 myself, and if I’m paid handsomely I’ll do front Caliper rebuilds, but the rear is so frustrating, fiddly and unrewarding (you usually find next time you change the pads the dust boot has de-seated anyway) that it makes me question what my time is worth and I pay Biggred!
if you do push on however a decent amount of red grease (or even a smear of brake fluid) can be your friend. Wish you the best!
I will do almost any job on the S2 myself, and if I’m paid handsomely I’ll do front Caliper rebuilds, but the rear is so frustrating, fiddly and unrewarding (you usually find next time you change the pads the dust boot has de-seated anyway) that it makes me question what my time is worth and I pay Biggred!
if you do push on however a decent amount of red grease (or even a smear of brake fluid) can be your friend. Wish you the best!
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02-24-2019, 04:35 PM
#8
Other option is to use a ring of plastic (old folder or something) to make a sort of 'cone' to help ease the piston into the seals. Push the piston into the ring of plastic (which is holding the dust boot open) then remove the plastic. It is a faff, but doable. I agree with the others though Having done it once, I wouldn't bother again. And I DIY everything!
02-25-2019, 02:47 AM
#9
Get a sheet of paper, laminate it, use it as a piston ring compressor, put it inside seal and push piston down inside it to slide it in.
Used this method when i did mine and just about managed it! But I would outsource now...
Used this method when i did mine and just about managed it! But I would outsource now...
02-25-2019, 09:43 AM
#10
It is achievable you just got to have major patience.
I didn't use any tools, your asking for trouble using anything around these seals.
I do like the idea of creating a sleeve out of some laminated paper though !
I greased the seal up.
I used my hands in latex gloves and managed to hook the seal over the piston on either side using my fingers. Then carefully push back as you run a finger around the piston with the seal on top of it.
Contamination was a major thing for me, the thought of a spec of dirt getting in or around the caliper seals will lead to a leak from damaged seals in a short space of time.
I didn't use any tools, your asking for trouble using anything around these seals.
I do like the idea of creating a sleeve out of some laminated paper though !
I greased the seal up.
I used my hands in latex gloves and managed to hook the seal over the piston on either side using my fingers. Then carefully push back as you run a finger around the piston with the seal on top of it.
Contamination was a major thing for me, the thought of a spec of dirt getting in or around the caliper seals will lead to a leak from damaged seals in a short space of time.