Quote:
Originally Posted by Da2ndCivic
Since this is for the rear disc brakes, the piston should be turned, not pushed back into the caliper. Pushing is fine for the front, but the rear shares braking components with the e-brakes, so pushing may cause damage to the e-brakes.
The grooves (pointed out in red) in the piston are there so that you can get a socket (i'm not sure the right term for it) to turn the piston back into the caliper.
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Right, that is why you have to use the rear caliper compressor tool like i did. It spins the piston as it pushes it back.