There are 2 bolts, I believe both must come out. I know the front brakes take a 7mm allen bit, don't remember about the back. However, on the back brakes, the piston needs to rotate as it is compressed! There are notches in the face of the piston that are intended to help create both rotation and inward pressure.
Get a caliper piston compression tool! Many parts stores offer them for loan or rent. I bought one for $7 U.S. It attaches to a standard ratchet.
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Sunday, March 21st, 2010 AT 12:15 AM