Brake problem during autocross
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This is a discussion on Brake problem during autocross within the Motorsports Talk forums, part of the Community - Meet other Enthusiasts category; Hey guys! Just finished my 2nd official scca autocross event and my 5th autocross event overall. I've incorporated left foot ...

  1. #1
    Registered User Acrdys's Avatar
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    Brake problem during autocross

    Hey guys! Just finished my 2nd official scca autocross event and my 5th autocross event overall.

    I've incorporated left foot braking into today's event as i've become comfortable to it.

    However... after the first hardbraking corner, the it feels as if I suddenly lose power from my brakes. (Brakes are really stiff like when the car is turned off) It's sometimes stiff and sometimes goes back to normal.

    Successful event overall though. 5 runs. 54.035 (Missed a gate and had to reverse back in to avoid dnf), 43.985 43.394 43.102 42.811. Slowly shaving off those seconds

    Anyways I'm fairly new to and would like to know if my brake situation is normal. Here's some eye candy for taking the time to help.


    DSC_2878 by ,


    DSC_2877 by ,
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    He simply abides. SD_GR's Avatar
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    Left foot braking adds another variable because it is easy to lose sensitivity in the left foot when switching back and forth between the clutch and the brake. If what you described happens when you are braking with your right, what it sounds like is that the brakes pump up -- the pedal is initially soft, then goes hard after being pressed first. This implies air in the system and/or a leak.

    To exclude the master cyl, with the motor on press the brake pedal while at a standstill. If it sinks to the ground suspect the master. Otherwise, check fluid level and if low, suspect leak (or worn pads of course).

    Another possibility would be that you are seeing the effects of hydrated fluid heating and cooling, but it's "only" autox and if your fluid is relatively fresh I'd not go that way at least initially.

    Since you've just started left footing though that's suspect in and of itself.
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  4. #3
    Registered User Acrdys's Avatar
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    Thank you! Looks like I have something planned for today other than watching football ^^
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  5. #4
    Registered User teflon_jones's Avatar
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    Nice pic there with the wheel in the air.

    Your brakes aren't made for this type of situation so they're not going to do well.
    Scott
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