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rear caliper piston trashed?

  • Thread starter Thread starter growler
  • Start date Start date
G

growler

Guest
I attempted to grab this piston out of my rear caliper tonight. I think i boogered it up. :(

If I did, where would you recommend getting a new one? Parts Outlaw?

D2EDB1E9-876A-4309-8F3B-B6BCC3DFDAAE_zps10fps7n0.jpg


9ABDF307-8549-4656-8BBC-C966BD61FD82_zpsdamcyhj1.jpg


9979E38C-6540-44D9-A739-3C7F5F930B07_zps1gvp1f4b.jpg
 
next time used compressed air to blow out the piston via the bleed port.
 
Seen Worse. The Important surface is the sealing surface. Piston appears to be almost clear of the bore. If the outer surface cleans up nicely with crocus cloth or a green scrubber, ya might be ok. What does the rest of the caliper and related components look like? Dust boot appears to be torn up, yes?
 
Yep, compressed air gets those out in a hurry. Just be careful, they shoot out with enough force to crush/lose a finger. To keep air in just one side of the caliper as you do this, put them back together with a piece of rubber or something blocking the brake fluid port.

If the pistons are pitted (and there's better than even chance they are), you can get a piston and seal kit from an OEM parts supplier.
 
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.
 
eil said:
Yep, compressed air gets those out in a hurry. Just be careful, they shoot out with enough force to crush/lose a finger. To keep air in just one side of the caliper as you do this, put them back together with a piece of rubber or something blocking the brake fluid port.

If the pistons are pitted (and there's better than even chance they are), you can get a piston and seal kit from an OEM parts supplier.
Click to expand...

No doubt! I was pulsing one with air one time and I could see it flexing in and out....luckily I was smart enough to put a towel over it. It came out like a cannonball.
One could lose some teeth like that. :eek:
 
Brake piston

Brake piston

I once asked a machinist why they don't make these pistons out of a solid peice, apparently the caivity is to stop heat build up. But act as a moisture trap at the same time.
 
growler said:
I ordered new seals from Z1 last week assuming I'd switch everything out.

I haven't found only the pistons available online yet. I'll continue looking. Otherwise, am I looking at purchasing item 1-1 (part number 69100-34851) on this fische? I'd be buying the seals again, though. I guess it wouldn't hurt to have spares.

http://www.partsoutlaw.com/oemparts/a/suz/50d401dbf8700230d8b4e5b9/rear-calipers
Click to expand...

Well huh. I am a little confused. I could have swore there was a piston and seal kit for the rear brakes on an 850. But looking through the fiches, I see only this "piston & pad" set. That will /probably/ contain pistons, seals, and brake pads. But you may want to call the vendor or wait for someone else here to confirm. (Fascinating that the pads alone appear to be $13 more expensive than the whole set...)

Also, make sure you get the pistons out so you can evaluate them before buying new ones. There's an outside chance they could still be good.
 
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growler said:
I think i boogered it up. :(
Click to expand...
Can't tell if you boogered it or not.
icon_shrug.gif


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.

.
 
1 tip for removal is to get 2 paint sticks and use them across the opening to "catch" the piston cups as the air pressure forces them out..
The 2 sticks are the perfect thickness to stop them just before they pop out - Using a towel to cover them also helps to prevent them cups from flying away when they pop out.
Be certain to have all your fingers out of the way when using air pressure - the cups will leave a permanent mark ! :eek:

I have seen worse that cleaned up okay with a file / crocus cloth - as long as the sides aren't scarred it should work again...

Use brake fluid as a lubricant to push them back in once you change all the rubber bits
 
growler said:
I attempted to grab this piston out of my rear caliper tonight. I think i boogered it up. :(

If I did, where would you recommend getting a new one? Parts Outlaw?

D2EDB1E9-876A-4309-8F3B-B6BCC3DFDAAE_zps10fps7n0.jpg
Click to expand...


That doesn't look bad at all. As long as you didn't scar the piston where it rubs against the seal inside the caliper body you are fine. I would clean up the damage with a file or some wet/dry sandpaper sitting on a flat surface and reuse it.


Mark
 
Great news. I'll use the air compressor method and use one of the methods listed so I don't injure myself. :) Once I get them out and cleaned up I will post more pictures. Thanks!
 
It may be the camera angle, but the piston looks a bit cocked in the bore

If so, straighten it out by turning the caliper piston side down on a block of wood and tap the outside of the caliper with a soft hammer until the piston pops back in

Some silicone spray on the piston circumferance first would help
 
Can I soak the pistons in rust remover? Or just the little wire brush on a dremel to clean up the concave portion of the piston?
 
KKBS said:
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.
Click to expand...

+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. :)
 
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 ...
 
tatu said:
+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. :)
Click to expand...

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
 
Wingsconsin said:
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 ...
Click to expand...

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.
 
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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.
 
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