You will need to loosen/open the bleeder on the calipers
before pushing the piston back into the caliper. ABS modules don't like having trash flushed into them backwards!
Open the bleeder on one caliper, after you put a hose on the end of the bleeder, and put the other end of the hose in a can, or other container, to catch the fluid. Then push back in on the piston. Once the piston is all the way retracted, close the bleeder. Repeat at each corner.
You really shouldn't have to bleed the system at all after replacing the pads. Just
be sure to pump the brake pedal a few times
before driving, so the pistons will move the pads out to the rotors.
You can either remove the pads before pushing the piston back in, or simply push against the pad itself...either way wil work.
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Joel Adams
C3VR Lifetime Member #56
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