User manual HAYES DISC BRAKES REAR QR IS

[. . . ] When you remove the two bridge bolts, the caliper will come apart into two pieces. There will be an inner and an outer caliper half and an O-ring between. Take the O-ring out and inspect it for any cuts or debris. [. . . ] Caution: Do not scratch O-ring groove when removing the O-ring, as this could cause the O-ring to leak. Remove the pistons from the caliper with pressurized air. Caution: Do not grab hold of the piston post with pliers. Blow it onto a clean, lint free rag or other soft surface. With your finger tip sealing off the bleeder or banjo hole, angle the caliper so the piston is facing downward, then direct pressurized air thru the hole that connects the 2 halves together. This will force the piston out of the caliper. Carefully remove the square seal inside the piston. The replacement kit will consist of a new piston and square seal. Inspect the transfer port O-ring recess. Be sure that it is free of any hair, dirt, etc. Warning: The O-ring is a special material and should be purchased through the Hayes caliper service kit. These O-rings are a special material that will not react with DOT 4 or DOT 3 brake fluid. Using an inappropriate O-ring that could deteriorate could cause a leak. Insert the bridge bolts, snug them, and then torque them to 110 in. -lbs +/- 10 in-lbs. Clean the caliper of any excess brake fluid by spraying it with isopropyl alcohol and wiping it down with a clean cloth. Note: Bleeders do not have to be replaced every time the caliper is rebuilt. [. . . ] If it is necessary to replace the bleeder, it is available as a service kit. The thread sealant on the bleeder is there only to seal during the bleeding process. If it wears off, replace it with a wrap of Teflon tape thread sealant. [. . . ]