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Old 09-22-2007, 02:43 PM   #1
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Default Rear Caliper_Unable to Retract Piston

New to the forum but GXP owner for 3 years. Tried everything to rectract rear caliper pistons for pad replacement including opening bleeder and disconnecting e-brake cable, have zero piston compression. Anyone come across this mystery before? Seems to be an internal mechanism preventing piston retraction.
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Old 09-22-2007, 02:46 PM   #2
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You are twisting them in with the correct tool, right? Rear disc brakes do not compress in like front ones. You need the proper tool that attaches to a 3/8" ratchet and it turns them back in. They are available at most parts stores.

Tool -

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Old 09-23-2007, 06:21 PM   #3
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Yep, don't ever try a C-clamp on the rear piston. Get the piston reset tool and twist while pushing to reset.
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Old 09-27-2007, 03:10 PM   #4
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Thanks folks!! Figured that one out after bashing my head off the ground a few times, tried a home-made custom spanner, worked like a charm.
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Old 10-01-2007, 12:55 AM   #5
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Which reminds me, a friend borrowed my tool like above and I need it back to do my rears.
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