Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  1. #1
    Join Date
    Jun 2011
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    Chapel Hill, NC
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    Vibration when braking at speed

    Hey guys so I was driving last night *in mexico* and I went to brake from a high speed and the brakes shuttered. Like a quickly paced vibration. Doesn't happen at lower speeds (less than 80) but if I am going faster and brake, there is this vibration from the brakes.

    Any ideas?
    -Chris-

    2003 ZHP Sedan - Jet Black on Sand - SOLD

  2. #2
    Join Date
    Mar 2011
    Location
    Baltimore, MD
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    Have you checked your rotors for flatness? It's very possible that they are warped, especially at 130k+ miles.

    Changing my rotors stopped my shuddering at high speed braking.
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  3. #3
    Join Date
    Jun 2011
    Location
    Chapel Hill, NC
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    No I haven't. I measured the fronts the other day and they came to 25mm give or take 0.1. Are they getting close to being shot?

    Here's a clip of a video I took of the vibration. Sorry but it's on a iphone... I am on the brakes (very lightly btw, not even stomping on them) whenever the video gets blurry or distorted.

    -Chris-

    2003 ZHP Sedan - Jet Black on Sand - SOLD

  4. #4
    Join Date
    Dec 2010
    Location
    South Central PA
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    Quote Originally Posted by Hornung418 View Post
    Have you checked your rotors for flatness? It's very possible that they are warped, especially at 130k+ miles.

    Changing my rotors stopped my shuddering at high speed braking.
    X2. The reason you feel it really bad at high speed is because of the speed of rotation. At slower speeds warped rotors are very hard to notice or not noticeable at all depending on how severe they are warped.
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  5. #5
    Join Date
    Jun 2011
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    Chapel Hill, NC
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    Well that's a bummer if they're warped. They're the BMW performance drilled rotors

    This is relatively new though as I haven't felt it before... maybe it is time to get new brakes. Wonder if I can find any more BMW perf. ones, hmmmm.
    -Chris-

    2003 ZHP Sedan - Jet Black on Sand - SOLD

  6. #6
    Join Date
    Dec 2010
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    South Central PA
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    Quote Originally Posted by HokieZHP View Post
    Well that's a bummer if they're warped. They're the BMW performance drilled rotors

    This is relatively new though as I haven't felt it before... maybe it is time to get new brakes. Wonder if I can find any more BMW perf. ones, hmmmm.
    Take your wheels off and place a straight edge ruler on the rotors, if you see any gaps, even little ones they are warped.
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  7. #7
    Join Date
    Mar 2011
    Location
    Baltimore, MD
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    6,940
    How old are the rotors?

    It's possible that you need new pads. Or you Powerflex FCABs may have backed out. Check into AKG Motorsports if that's the issue. They're line of products is far superior than that of Powerflex.
    Porsche 944 Turbo Build

    One ride and you'll understand why most rocket scientists are German.

    My ZHP Build 2004-2014 RIP


  8. #8
    Join Date
    Jun 2011
    Location
    Chapel Hill, NC
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    I honestly have no idea how old the brakes are. Like I said I measured them at home at they came out to be 25mm +/- 0.1. I don't know what they were to begin with but that's what the fronts are down to now. They were on it when I bought it this past July. I know the rear pads are getting to the end of their life but the fronts are still pretty full.

    I think I'm going to head over to my friend's garage here in town to get under my car and see what I can find.
    -Chris-

    2003 ZHP Sedan - Jet Black on Sand - SOLD

  9. #9
    Join Date
    Dec 2010
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    South Central PA
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    Quote Originally Posted by HokieZHP View Post
    I honestly have no idea how old the brakes are. Like I said I measured them at home at they came out to be 25mm +/- 0.1. I don't know what they were to begin with but that's what the fronts are down to now. They were on it when I bought it this past July. I know the rear pads are getting to the end of their life but the fronts are still pretty full.

    I think I'm going to head over to my friend's garage here in town to get under my car and see what I can find.
    Oh if you have a buddy with a shop just ask to use his dial indicator. Place on rotor, spin, watch for a fluctuation to the left or right.
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  10. #10
    Join Date
    Jan 1970
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    Liberty Township, OH
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    Quote Originally Posted by M3TA5IN View Post
    Oh if you have a buddy with a shop just ask to use his dial indicator. Place on rotor, spin, watch for a fluctuation to the left or right.
    $10 dial indicator is a pretty good purchase at Lowes.

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