I bought a new (rebuilt) caliper from Delco--went to put on and the seal around the piston popped off the ridge around the piston hole. I have been trying to put on but I get one side and not the other---its not bent or damaged and I don't want to take the part back--any help for snapping the piston seal back on?

------------------
Pat Jones

Just the rubber boot right? it's the air trapped in there that is your enemy, you can carefully use a pick or a paperclip wedged between the piston & the rubber to give the air an escape, then work the seal back in.

------------------
1986 SE 3800SC/4t65eHD (12.871@104.96) I'll Sell it if you like
1985 GT 3800SC (swap in progress)

[This message has been edited by 1fast2m4 (edited 07-29-2013).]

Easiest way to get that seal on is with a press. You can get a press to do that job at harbor freight.

http://www.harborfreight.co...hop-press-33497.html

Find a piece of tubing, pipe, etc. The same size as the seals outside lip.Seal should be the square cut metal ring moulded in rubber with piston lip.
Make sure the tube/pipe is not sharp or contacts the thinner rubber area. You only need around an inch long. Lay caliper on something to keep it straight. Put tube/pipe over seal. lay a small piece of wood over tube. If you can access the wood straight from the outside, just tap down the wood, keeping the tube square to the caliper. If you can't get a straight angle, you can use something to press between the wood and the outside of the caliper. Scissors/X bolt type caliper piston compressor works well. Crude but works.
There are seal drivers just for this, but the diameter is not common. Most are hand/hammer in, just like bearing race drivers.