So im in the process of installing my new rebuild kits i just got, and besides a few of the usual troubles i seem to always have i have one quick question. The kit came with a balck circular ring, im assuming its an o ring of some sort, in the directions it shows this going in the piston bore part of the caliper, however, when taking my current ones apart, i never came across this part in question, it says the rebuild kit is for 91-92 third gens 93 and up camaros and i believe the c4 vette. Do i have to use this? even though i never had on before? It also makes it pretty hard to get the bottom dust boot to seal up in the piston bore when putting everything together, and i dont want to force the issue if im not supposed to have it.

 

Have you taken your piston out yet? If not, it's still in there. You must have this piston installed or the caliper will leak.

Ed