24 replies to this topic

[jambolincs]

just been looking at the rebuild kits is it a easy job does the piston just pull out or is there a speacial tool needed?

[jime17]

You might need to get something long and flat such as a chisel flat side down between the lugs on the pad to slightly lever then apart to get the pads out or the whole calliper with pads still in past the ridge that's been worn in the disc.

Yeah pretty simple. Get a mate to slowly pump pedal with pads out. They should push far enough out to then pull them out with water pump pliers. If one is seized completely, clamp the free one in with a g clamp until you've got it moving with pedal pumping power. Then release clamp and slowly pump both out.

Go easy. Or you'll pump one right out and get dot 4 everywhere.

The hardest bit about replacing the seals I found was getting the metal dust seal in. its a bit fiddly and you can easily ruin them.

Edited by jime17, 17 June 2013 - 07:22 PM.

[KernowCooper]

You should not put water pump pliers anywhere near the pistons as any cutting on the surface coud damage the bore of the caliper and the seals pump out is the way  I'd do it

[jambolincs]

what about splitting the caliper ive looked online and some people are saying to avoid if possible but if im going to put new pistons and seals in i might as well completley clean them up and split them and put new o-rings at the same time i think i just need to torque them up to the correct setting dont i?

[miniman24]

Was it not pulling all over the road with a seized caliper?

[jambolincs]

Was it not pulling all over the road with a seized caliper?

it was a bit mainly when i accelerated it pulled to the right

[KernowCooper]

Maybe one piston siezed and other ppiston in contact stopped it from pulling ? but yes I would have thought it pulled the opposite way to where the calipers siezed

[jime17]

You should not put water pump pliers anywhere near the pistons as any cutting on the surface coud damage the bore of the caliper and the seals pump out is the way  I'd do it

I meant using water pump pliers to grip round the circumference once you'd pumped them nearly all the way out.

You won't touch the calliper bore.

I take your point about damaging the pistons though. I assumed these would be changed and therefore it wouldn't matter.

[KernowCooper]

Yes mate if new one are going in your most certainly correct, I was refering to referb and new seals on the old pistons if they were servicable

[jime17]

Cheers kc. I should have read the op more thoroughly.

Jambo,

I've split a caliper before now. however there are people who's opinion I respect greatly who warn against it.

If I'd read their posts before I did it I'd almost certainly not have done it, but it was too late.

I changed the o ring, cleaned the mating surfaces thoroughly and put bolts in with thread lock.

Again though, some really experienced folk warn against it and it makes sense to heed their advice if you're unsure. You can re furb without splitting.

Edited by jime17, 17 June 2013 - 08:38 PM.