by sirrick4 » Thu Mar 16, 2023 12:07 am
Jeez, what a mess. Not surprised it was sticking. First of all, check the circumference of the new dust cover seal and then check the circumference where your red arrow is. If they are the same then try to get that old bit of metal out of there. The seal is an interference fit. It is meant to be hard to get in or out. When you replace that seal, try and find a press to do it properly. Failing that, you will need a socket just slightly smaller than the seal and a hammer. The hard bit is driving the seal in straight. The next thing I would be doing is to attack the entire caliper with a small circular wire brush and clean all the rust off it. You should probably finish cleaning where the piston sits with some fine steel wool. That damage doesn't look too bad from what I can see. How bad is the piston itself, is it worn? You may need to buy a new one. If you think you can get away with using it, then it will need to be cleaned up as well. The piston seal will need to be removed. It looks stuffed. You will need a fine bladed screwdriver to prise it out. Don't forget to clean out the groove that it sits in. You should also remove the bleeder nipple and clean the bleed hole. A new bleeder nipple should come with the kit. Once you have finished cleaning and degreasing it all, you can paint the caliper if you want. Use a good quality etch primer first or a good quality zinc paint. Don't paint the piston or the cylinder. When you are ready to assemble, do it on a clean dirt-free bench. Use brake fluid (nothing else) sparingly to lubricate the parts prior to assembly. Once you get your piston back in, check to see that it is a tight fit. You should be able to move the piston by hand. As a rule you should do both calipers at the same time. the other caliper will probably look very similar.
I hope you can understand my waffling there. Good luck with it.
Rick ......1975 Monza 2+2