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Message: <blockquote data-quote="pcb" data-source="post: 6616216" data-attributes="member: 100884">It's a 4 mm.I just checked my rear caliper from my parts car (it's disconnected from the car).I played with it for a bit and realized that turning the adjustment screw doesn't pull the piston in.You still have to push on the piston after turning the screw. The adjuster just adjusts the stopping point of the piston.Try backing off the adjuster a bunch of turns then push in the piston.Sometimes the whole mechanism is messed up and doesn't work but, you can also rotate your entire piston and screw it back in.If you try to screw in your piston, make sure your piston boot is free to rotate and not stuck on the piston or it will rip.</blockquote>

Verification: Which of 49, 92, 5, eighty three or thirty five is the largest?