rear caliper piston trashed?

[tatu]

One can also extract the pistons with caliper installed, pads removed. Place some rags / towels around the caliper, pistons forced out by pumping brake pedal. No danger of flying parts.

+1 here I cannot understand the gay abandon by which people say "ya fine, used compressed air, its a foolhardy ridicules way of pushing/forcing a stubborn piston out, plus, it's horribly risky, compressed air is a mad, dangerous way of completing such a task, just pump it on the pedal/lever. Slow easy, measured way with a rag to catch any spillage, instead of trying to puff the bleeder out with an airline trying to cover both ears with one hand awaiting the inevitable bang that proves you are an rank amateur, ready to duck the missiles.

[Wingsconsin]

so tatu ...your way is the only way that is acceptable ..?

I have popped them out with controlled air pressure on at least 2 dozen calipers over the years ...never had one fly across the room ..never pinched a finger ....never even dropped a piston ...
My way also works and I consider myself a bit more than a rank amateur...

There are many correct ways to accomplish a task ...

[Guest]

+1 here I cannot understand the gay abandon by which people say "ya fine, used compressed air, its a foolhardy ridicules way of pushing/forcing a stubborn piston out, plus, it's horribly risky, compressed air is a mad, dangerous way of completing such a task, just pump it on the pedal/lever. Slow easy, measured way with a rag to catch any spillage, instead of trying to puff the bleeder out with an airline trying to cover both ears with one hand awaiting the inevitable bang that proves you are an rank amateur, ready to duck the missiles.

Wow. It's not exactly rocket science. Wrap the caliper in a rag, point the piston away from your face and just give it a quick shot of air. Any time I have been removing pistons the caliper is not still attached to the master cylinder, so your method of pumping it out is not an option.


Mark

[tatu]

so tatu ...your way is the only way that is acceptable ..?

I have popped them out with controlled air pressure on at least 2 dozen calipers over the years ...never had one fly across the room ..never pinched a finger ....never even dropped a piston ...
My way also works and I consider myself a bit more than a rank amateur...

There are many correct ways to accomplish a task ...

Not saying that at all, air is compressible and is expandable, why do such a dodgy thing and then advise it on the net? Its a daft and unnecessary risk, who knows what the guy's level of competence, knowledge or equipment is when advising such practice.

And anyway, if the piston can be pushed out using air it isn't really stuck.

[growler]

Well, this lady did just fine using the air compressor method. I agree it can be risky when not paying close attention to:

a) how many psi are being applied
b) where the piston is going to go when it pops out

I had success around 60-70 psi. Thanks for the help.

[Wingsconsin]

Well done !

Well, this lady did just fine using the air compressor method. I agree it can be risky when not paying close attention to:

a) how many psi are being applied
b) where the piston is going to go when it pops out

I had success around 60-70 psi. Thanks for the help.

I rest my case .

[growler]

Cleaned up my calipers with simple green and a toothbrush. Cleaned up the pistons and will see how the little nicks/abrasions line up with the seals - hopefully they won't cause any issues.

Maybe I should paint the caliper while I have it off. Hmmm.

[growler]

Thanks, Steve.

I'll bookmark that page in case I need to get new pistons.

Can't tell if you boogered it or not.

We need to see the surface that is hidden by the dust boots.

The SIDES of the piston are what's really important.

If you need to get pistons, try Parts-n-More.
Go to page 2, scroll down just a bit, the are near the top of a long page.

.

[growler]

got everything back together. no leaks.

now to do the front calipers.