Syptom: vibration when braking at high speeds
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This is a discussion on Syptom: vibration when braking at high speeds within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So my friends thinks it's because my rotor(s) are warped. The fix will be new rotors. I get the vibration ...

  1. #1
    Registered User QuickSilver's Avatar
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    Syptom: vibration when braking at high speeds

    So my friends thinks it's because my rotor(s) are warped. The fix will be new rotors.

    I get the vibration only at speeds greater than 70 mph and it's only during the initial decelleration (read: does not keep vibrating).

    Is there anything else that could cause this?

    opinions?

    thanks,

    Dan.
    '02 Plat. Wagon, Manual

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    Registered User NJwrbT-WRX's Avatar
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    First thing that came to my mind was warped rotors, but I know someone that had a similar problem and it was fixed from just new pads.

    Do you use a torque wrench on your wheels? Uneven lug torque is about the easiest way to warp a rotor.

    -joe
    '02 WRB Sedan

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    Moderator GV27's Avatar
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    This is pretty common. My theory is that the stock pads have a bad out-gassing problem. Switching to aftermarket pads cured this on my car.

    C
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
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    Registered User QuickSilver's Avatar
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    Clarification:
    I have Hawk HPS pads on...installed about 5 months ago.
    I did have an incident where a loose lug resulted in the stud breaking off my front left wheel...the wheel itself became dangerously loose. I had it replaced at a reputable garage.

    The vibrations happened well after that event, so that's why I didn't think it directly correlated.

    How can I tell if the rotors are indeed warped? or if the pads are bad. It's cold here in MI...don;t really want to mess around w/ the car too much...

    thanks for your input,

    dan.
    '02 Plat. Wagon, Manual

  6. #5
    Moderator GV27's Avatar
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    LOL. I kinda thought you'd been around long enough to know about the stock pads, Dan!

    Use one of these to measure it. You might be able to rent/borrow one from an autoparts store:

    http://www.hswtools.com/store/mercha...tegory_Code=ST

    Try getting your wheels re-balanced. It's certailnly possible for an out of balance wheel or out of round tire to only show up as vibrations under deceleration forces.

    You'd probably feel warped rotors at all speeds.

    C
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

  7. #6
    Registered User QuickSilver's Avatar
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    [QUOTE]Originally posted by GV27
    [B]LOL. I kinda thought you'd been around long enough to know about the stock pads, Dan!

    ??? What about the stcok pads? I did a search..nothing.

    ...and even tho I've been around, I still come across "blind-spots" in my "training"


    Try getting your wheels re-balanced. It's certailnly possible for an out of balance wheel or out of round tire to only show up as vibrations under deceleration forces.

    I swapped back to stock wheels and tires for the winter and there's still vibration. So I don't think it's a wheel balancing issue.

    You'd probably feel warped rotors at all speeds.

    I just wish it was warm enough for me to pull them off and inspect them properly...for now, unless people think it's a BIG mistake...I'll try to ride out the winter the way it is.

    dan.
    '02 Plat. Wagon, Manual

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