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Answered 2007-04-03 13:36:00

IT WON'T COMPRESS BECAUSE THE PISTON HAS TO BE SCREWED BACK IN WHILE COMPRESSING THE PISTON AT THE SAME TIME - THAT IS ALSO HOW THE BRAKE'S (BRAKE PEDDLE) IS ADJUSTED.ALSO THEY MAKE SPECIAL TOOLS TO DO THAT - IF YOU REALLY NEED THEM.& ALSO THE BLEEDER SCREW SHOULD BE LOOSENED (if calipher is removed) so as NOT TO PUSH COMTAMINATED FLUID BACK INTO THE (ANTI-LOCK) SYSTEM (if equiped) & NOT TO PUSH BAD FLUID BACK INTO THE MASTER CYLINDER. Autozone sells a neat little tool that attaches to your 3/8" ratchet, just like a socket. It has grip devices that will grip the top of the piston and allow you to easily screw the piston back into the caliper. The little tool is inexpensive (around 2.00) and is a lifesaver if you are going to do rear disc brakes .

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