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  1. #1
    mtbr member
    Join Date
    Feb 2004

    Lever Air Leakage?

    One of the bikes I service has XX discs; 3 years old. When bleeding, it seems as though air is pulled through the lever when bleeding; I can hear what sounds like air leaking through the lever body. Is this possible? Does the lever need to be rebuilt? Any thoughts? THX

  2. #2
    mtbr member
    Reputation: winter's Avatar
    Join Date
    Nov 2009
    Are you sure the air is coming from the lever body and not from a poor seal else where?

    Couple possible sources of air leak...
    1) luer lock on the bleed syringe is loose
    2) brass fitting not tight against the bleed port on the lever
    3) brass fitting's o-ring is damaged
    4) there's a hole in the tubing connecting the syringe to the brass fitting

    If there truly were a leak in the system sufficiently large to allow air to enter when you pull on the syringe, then it would also allow the DOT fluid to escape when you compress the brake lever and the master piston; the brake would therefore become useless after a few pulls on the lever as DOT fluid drains out and air enters into the system.

    If the leak is truly at the lever, then yes you'll need to do a complete rebuild.
    Go on ahead, I'm gonna take a breather.

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