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Old 25-09-2011, 08:00 AM   #1
david lee
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Default rotors

can someone tell me if front rotors can vibrate at high speed without using the brake.when i purchaced my xr6 they were machined .also slowing down from say 100 kmph they vibrate when using the brake.can the rotors be warped . cheers .

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Old 25-09-2011, 08:10 AM   #2
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Default Re: rotors

If when slowing down while braking they would definately be warped. What model XR. If pre AU could also be wheel bearing adjustment.
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Old 25-09-2011, 08:29 AM   #3
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Default Re: rotors

If there's vibration at high speed without touching the brake pedal, the cause is wheel balance.

If there's viration ONLY when you touch the brake pedal, it's the rotors.
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Old 25-09-2011, 11:01 AM   #4
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Default Re: rotors

Quote:
Originally Posted by Sox
If there's vibration at high speed without touching the brake pedal, the cause is wheel balance.

If there's viration ONLY when you touch the brake pedal, it's the rotors.
Agreed. That's the most likely cause.

If getting the wheels balanced doesn't get it sorted, perhaps one of the calipers is sticking. That'd be pretty rare though.

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Old 25-09-2011, 11:03 AM   #5
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Default Re: rotors

Severely warped rotors will vibrate a bit with no brake pedal applied at high speeds, If you hit the brakes and it shakes a bit more its definitely rotors.
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Old 25-09-2011, 11:35 AM   #6
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Default Re: rotors

another place to check,
the front lower control arm bushes
once they are old they can perish/fatigue and sort of go soft too,
when you brake they can move around a lot and cause vibrations
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Old 25-09-2011, 02:13 PM   #7
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Default Re: rotors

Quote:
Originally Posted by Hood-G6
If when slowing down while braking they would definately be warped. What model XR. If pre AU could also be wheel bearing adjustment.
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