Hayes:Piston will not push in...?- Mtbr.com
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  1. #1
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    Reputation: RetroG's Avatar
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    Hayes:Piston will not push in...?

    Replacing front pads on HFX-9. Removed old pads. Inner piston is flush with caliper and new pad went in fine. Outer piston will not push in, therefore pad will not fit. I can put a good amount of pressure on the piston with a 10mm box wrench, piston goes in slightly, but slowly moves back out. There is still pressure behind the piston. Any thoughts?

  2. #2
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    Reputation: InvictaS1's Avatar
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    sounds like there might be some air in the system, bleeding the brakes should fix the problem.

  3. #3
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    your piston might be sticky. add some DOT 4 to lube the side of the piston and slowly push it in,,,pump out,,,push in, until the piston moves smoothly. that does the trick, if your system needs bleeding,,,well, you still need to do it to lube the square seal around the piston.

  4. #4
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    Put the master cylinder in the bleed position, remove the bleed screw or plug wrap a paper towel or attach that catch bottle and push the piston in, any fluid that comes out is extra. Lube the pistons with brake fluid, clean off the excess fluid with alcohol before you reinstall the pads,. The piston interface is likely dirty and needs lube to operated normally.

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