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Vibration in brake pedal

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Old 03-27-2007, 05:31 PM
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Vibration in brake pedal

I jus put my new wheels on they are 18x7.5 well after putting them i have noticed a slight vibration in the brake pedal when im goin over 45mph and i step on the brake, it almost seems like the rotor is to small for the rim. can someone help me with this or give me some advice, i dont want to take it back to the dealer cuz i dont want them to void warranty cuz i put diff wheels on it. thanks
-chad-
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Old 03-27-2007, 05:44 PM
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in this case ill put the originals back on ,it wasnt doin it before i put the wheels on, the rims are balanced. with no locking lug. it only does it when i brake, when im driving its fine.
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Old 03-27-2007, 05:58 PM
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i put them on myself, i have no abs and the car only has 2,000 miles on it
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Old 03-27-2007, 06:03 PM
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Originally Posted by chadpuska
i put them on myself, i have no abs and the car only has 2,000 miles on it
Did you use a torque wrench and tighten in the correct pattern? Overtorqued lug nuts can warp rotors.
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Old 03-27-2007, 06:05 PM
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yes i did but i wasnt sure what to torque them to, if the rotors were warped wouldnt that cause them to vibrate at all times though?
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Old 03-27-2007, 06:37 PM
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Originally Posted by chadpuska
yes i did but i wasnt sure what to torque them to, if the rotors were warped wouldnt that cause them to vibrate at all times though?
Without looking up the actual number, 100 lbs. ft. should be safe. You can have any number of possible problems with different wheels/tires. Wheel and/or tire runout comes to mind along with balance. Someone suggested putting your original wheels and tires back on. That would be a great diagnostic tool to at least eliminate the rotors.
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Old 03-27-2007, 09:18 PM
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well thanks for your help
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Old 03-27-2007, 09:36 PM
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if i take it in with the new wheels on it do you think they will void warranty?
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Old 03-27-2007, 09:36 PM
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Also on an empty clear road you may wish to pull the hand brake on, GRADUALLY. It will help to determine location of problem.......rear in this case.

Also, heard the little retainer washer on the rear drums are causing some problems.....not allowing to machined surfaces (wheel and the drum)complete contact.

The hub and outside drum surfaces, according to GM, should be wire brushed BY HAND, if any appearance of rust, corrosion, dirt is apparent....otherwords cleaned well.
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Old 03-27-2007, 09:37 PM
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Just put the old wheel & tires on the two front & try it. Be sure the the lugs were centered on the wheel. Are they multi hole wheels?
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