1 Stuck piston - Cobra PBR calipers

[Brent]

I've had these for 6 years now (purchased from SHOSource).

I have a real grinding noise in the right front. So I took it apart this AM and it appears the rear piston is not functioning like the front one. If I put a clamp on the good one the faulty one works. But is hard to push back.

If I leave both pistons unclamped the working one comes out easily. The faulty one only works if the working one is clamped.

And this was after I hit it with penetrating oil.

As soon as I put everything back together it still does it. No improvement.

I did have a brake failure a while back where I blew a brake line in the rear.

Is it possible I have air in the one piston? Or when the repairs was made to the ruptured line that some old dirty fluid got in the front ones? I don't think the whole thing got flushed.

Or is it simply seized and I need a new caliper.

Or is there a kit to repair pistons?

 

[shopartsnw]

I have rebuild kits for the calipers, and they are very easy to rebuild. I can talk you through the process, or you can get me the caliper and I will do the rebuild for you.

FYI, there were two different diameters of pistons, so I would need to know which calipers you have to get you the correct kit.

Mike

 

[Ishodu]

I wouldn't mind having a rebuild kit on hand myself. I assume they come with the new rubber boots that I burnt to a crisp?

 

[shopartsnw]

I wouldn't mind having a rebuild kit on hand myself. I assume they come with the new rubber boots that I burnt to a crisp?

Email me at mike AT shosource D0T com if you want, and I can get you the parts.

Thanks

Mike