Rear Brake Piston Issues - Help

[mkrasavin]

Hi guys,

I was changing my rear brake pads and noticed that when applying my rear break the right piston does not move inward to apply pressure to the brake pads.
Here is a picture


I used a bolt and some vices to push out the actual piston. I noticed there are a lot of scuff marks on it and no O-ring in it. I am having some issues with getting it back in evenly.

Does anyone have any advice on what to do?

Or worst case scenario what I have pictured in good condition with a rubber O-ring for sale?

Its a 2004 Suzuki GS500F.

Any input in appreciated.

Thanks,

[dorris1988]

Could be partially seized.. no oring or dustseal?(I'm guessing this is the same as a 1991 caliper or near enough) try using the hydraulic pressure to push the piston all the way out and check for corrosion(white powder substance) and give the piston and inside of the cylinder(specially where the oring should be) a real good clean out. Get a screw driver in there to remove any corosion. Then rebuild the caliper with a kit if this is the case. I did this with mine and it was a fully seized caliper. Both pistons. Took an hour of forcing to crack the pistons free. And now my back break is as smooth as a babys bum. =)

Might just need cleaning and new seals put on. Make sure you keep it clean when rebuilding. And remember its a hydraulic system so when the caliper is removed crimp the tube!