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Thread: Mystery brake failure

  1. #21
    Join Date
    Jul 2010
    Location
    West Michigan
    Posts
    120

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    I once agreed with a lot of posters that say it is not the brake booster. It really doesn't make sense to be a booster. As another poster said tough the failure is internal to the booster and causes the pedal to feel long and soft. In my case the brakes would engage with good bite and as I stayed on the pedal the braking force would decrease. Made the car feel like it is on roller skates - would just not slow down consistently.
    2012 Third Place ITA Great Lakes Division
    1990 Honda CRX Si (ITA)
    2007 BMW X3 Sport (Stop Light Time Trials)

  2. #22
    Join Date
    Sep 2008
    Location
    FL.
    Posts
    1,384

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    Roebling is very easy on brakes and easy on the curbs.
    Could be the booster but as noted the usual symptoms are a hard pedal(no boost), or a very sof deep pedal( no vac relaese) with brakes dragging.

    If the car has drum brakes, the wheel cyl could have backed off and or the adjusters might be backed off. MY drum brake cars do this, resulting in a deeper pedal.
    Pad knock often results in a slight pull side it side as one brake may not be knocked back.

    Snug the front bearings, check the rear cylinders, bleed the brakes.
    Check for the brake lines running near something hot . That can cause a very deep or no pedal also. Many cars have the front brak line running across the firewall , if the line gets hot, the front brakes will not work well and the rear will lock.
    Mike Ogren , FWDracingguide.com, 352.4288.983 ,http://www.ogren-engineering.com/

  3. #23
    Join Date
    May 2003
    Location
    Colchester, CT, USA
    Posts
    2,120

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    I would say that with the age of cars we are dealing with, going ahead and replacing the booster is not bad insurance either way..............
    Jeff L

    ITA Miata



    2010 NARRC Champion

    2007 NERRC Championship, 2nd place
    2008 NARRC Championship, 2nd place
    2009 NARRC Championship, 2nd place

  4. #24
    Join Date
    Aug 2009
    Location
    Atlanta, GA
    Posts
    13

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    For what it's worth, the new booster did in fact cure the problem. Brakes were not the excuse for my poor lap times at the ARRC

    Thanks all for your help. I'd have never thought to swap the booster given the symptoms.

    Steve
    '83 RX7 - IT7 - Atlanta

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