How do I adjust the piston. The unit on my car will not retract enough to allow me to install a new pad. I used a thin used pad, and I knoe it ain't right. Jerry from PI said to turn it 45 degrees and depress it, then turn it back and it will be self adjusting. While my friend Ron says the threads are fine and you must turn it many times. I can't even get this one to turn at all. What do I need to know?
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