Quote:
Originally Posted by JB3
usually if the piston is completely frozen in the bore, its rust on the exterior side of the piston outside of the square cut seal and rarely any deeper.
If your pistons are frozen, after you have split the caliper apart, using a tool that grips the inside of the piston, you should be able to put enough force on the piston to rotate it out of even a rusty bore. Once thats done, you can assess the level of damage and what needs to be done.
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Another method to remove a stuck piston: use a grease gun. On those grease guns with a lever ..... they push the grease out at high pressure .... maybe over 10000 psi , don't remember exactly how much, a lotl
Remove the female nipple on the tip of the grease gun that fits on a zerk fitting, the threads at the end of the out put pipe on the grease gun are the same as the brake fluid input threads on the calipers. So screw it right on to the brake fluid input of the caliper and start pumping. That will put A LOT of force on the piston. I never saw a piston it wouldn't push out.
Its a greasy mess .... you can reduce that mess by filling the caliper with water first. Lots easier to clean up ... and .... incompressable.
Splitting the brake calipers makes it a lot easier, a lot, to do a good rebuild.