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  1. #1
    mtbr member
    Reputation: skywaybuzz's Avatar
    Join Date
    Dec 2003

    Good job! Paging Randy@Hayes

    Hey why would my Hayes Purples with Razor Rock levers, Goodridge lines, pump up at the lever? When I'm at elavation (Snowshoe WV) riding down the mountain I'll hit my brakes and if I hit them immediately again the lever will engage further out. If I wait 1- 2 seconds they will engage normally again. Its like the fluid doesn't drain back into the bladder quick enough. Maybe I should bleed them at elevation? Or the Dot fluid (Ate Super Blue Racing) is acting weird, but I recall I changed to the blue fluid to try to cure the pump up. seems it only started after I replaced the master cylinders I got from Icycles last June. Also doesn't happen when I'm riding locally in PGH. Could it be heat expansion? Although I can't recall my other Hayes Mag's equipped bike doing it when I had it up at Snowshoe. What are those 3 small holes and one larger hole in the cartridge supposed to do Randy? How important are those small packets of bladder lube? I did use them, figuring it would help the bladders expand and sit in the lever housings.I did bleed many times thinking I had hot air expansion. Thanks, looking forward to Ride !
    Last edited by skywaybuzz; 02-09-2005 at 10:01 PM.

  2. #2
    Race Technician
    Reputation: Randy@Hayes's Avatar
    Join Date
    Jan 2005
    Yes, what you are seeing is heat expansion. The holes in the master cylinder cartridge allow the hot fluid that's coming up from the caliper to cool in the master cylinder when the piston in the cartridge is retracted, like when the brake lever is not actuated. The key phrase you said was " If I wait 1-2 seconds they will enguage normally again" The fluid needs to cool or the lever will pump up. If the lever is compressed partially during a run and the piston blocks these porting holes, it will happen. Letting go of the lever completely a few times during your runs should cure this. The bladder lube helps assembly of the bladder into the lever body. It allows it to seat correctly.


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