shall I rebuid or get new caliper pix
 

hi there
so I finally got the calipers out, cleaned them but looking at them I wonder if I should get new ones

Is the inside should look like this
the piston look fine to me
look at those pics
and give me your advice please


AB


http://forums.pelicanparts.com/uploa...1238356558.jpg
http://forums.pelicanparts.com/uploa...1238356701.jpg
http://forums.pelicanparts.com/uploa...1238356768.jpg

I would clean it up and rebuild it. If your not getting any brake fluid seepage, then your fine. It's only about $15 for the seals, so why not give it a try?
Darin

They look great to me. I have seen photos of much worse.

Are those steel or alum pistons?

they seem to be steel
AB

At this very moment I'm rebuilding mine. I'm using a dry green scotch brite and it is shining everything up. I wish mine looked as good as yours before I started. I'm glad I decided to rebuild when doing a brake job because it looked as though the fronts weren't working as good as the backs. In fact one of my front pistons was a bit&* to get out. But after some time with the scotch brite it looks pretty good.
Tom

those look great! rebuild away.

That looks better than average in my experience. I hope that is not a dimple on the piston, but even so it looks small enough that is should not be a problem; no more than half the width of the O-ring seal in my estimation. The green scotch brite pads are very good for cleaning brake parts. Use a Q-tip in the O-ring seal groove to get out all the crap. Scrub the bore outside of the O-ring seal groove as best you can; this is where most build-up occurs that interferes with piston action. Rinse well with alcohol, and blow it clean with compressed air. I always use brake assembly lube when rebuilding, but I am not sure where you can get that stuff these days.

Rebuilt my calipers last summer, but I went with stainless steel pistons.

If the weight in your hand is unsure, a magnet will tell for sure.

thanks every one
AB

Just rebuild them; the kits are cheap and available here. You will need silicon brake assembly grease, a compressed air source, 400 grit silicon carbide paper, brake cleaner spray and a selection of C-clamps and small chunks of hard wood to seat the dustboot retainers. I found it to be an easy and satisfying DIY project. I also put speed-bleeders on it for simplified bleeding. If they're really filthy you can soak them in kerosene for a couple days to loosen the crud.

Look fine to me. Just new seals and you're good to go.

wow i wish mine looked that good.

Both of my front dustboots were in shreds - as a result, the part of the cylinder on the outside of the O ring seal had gunk on them as well as the pistons. After working on the pistons, they look as good as new - the cylinders look great on the inside of the O ring but a bit stained on the outside.
They seem to work a lot better now than before the rebuild.