Question about 2004 Chevrolet Impala

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Brake problem I just put new brakes and rotors on my 2004 impala and I get a shimmy when I try to stop at high speed. It is coming from the front.

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You can jack up each front wheel one at a time, and spin it. It works even better if someone can apply a very light amount of brake pressure when you do it, and you can tell if you have a warped rotor. Also, just to be safe, double check your caliper bolts from where you re-installed it after the pads. 9 times out of 10, if it just started after new brakes, you may have a warped rotor. The store should take it back if I am correct. Good luck.

Posted on Feb 28, 2009

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Warped brake rotors most likely cause. Other possibilities include wheel bearings, u-joints.

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Does it occur when you apply the brakes? A warped rotor will cause a shake or shutter (primarily felt in the steering wheel and brake pedal) when the brake are applied. Most shops no longer resurface brake rotors any longer because of the reduced prices for a new replacement rotor, but resurfacing a rotor will bring the rotor true (even no wobble) and take away any brake shimmy or shaking.

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Wobble when I hit the breaks at high speeds 60 to 65mph


Its possible one of the new rotors was dropped before it was installed.
If it only happens when you hit the brakes it almost has to be a brake rotor out of round or a slick spot on the surface.
Same thing with the slow speed grab. It could also be on the rear instead of the fronts.

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I have a problem with disc brakes, 5-6days to destroy them and the car shakes ... why?


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When braking from high speed front end shimmy's and steering wheel vibrates


Hi,
from your description I would list these possibles.
One or both front brake disc's / rotors are warped.
One or both front brake disc's are badly scored

If the fault, as you described it only happens when braking from a "high" speed, I would check the above.

Front end shimmy under "normal" driving can be caused by numerous faults in addition to those I stated above. However, I am using your definition as a scenario.

Good luck.

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We had two new tires put on the front with a front end alignment and supposedly a wheel balance. We noticed the Jeep "shimey" when we break coming off a highway when it wasn't prior.


Take the car back and have the tires re-balanced. Also have the front brake rotors checked to see if they are warped. If your front rotors are warped it will give you a shimmying effect when you apply the brakes coming to a stop. If they are warped you can either have them "turned" to bring them true again, but sometimes the rotors are inexpensive enough to just replace because even though you turn them there is a chance they will warp again in a few days.

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If it shimmies with the brakes applied, it's a rotor problem....but like you say, it shimmies just at a certain speed with no brakes applied, check tires for out-of-roundness. If they look ok, you are looking at a balance problem with the tires.

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In 2004 Impala, do I have rotor or drums?


The best way to answer you question is to tell you to take the vehicle to your nearest dealer and inquire with the parts dept. I can tell you that on the ffront of your car you have rotors and the brake used on the front is called a pad. Also your vehicle does not have a separate parking brake. It is the same as the regular rear brake no matter which type of brakes you have on the back.

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1 Answer

I have a shimmy in mySteering wheel not all the time it comes on randomly.


In absence of more information, this is usually an symptom of warped brake rotors. A rotor can build up enough heat in a hard stop to be bendable especially with the high hydrolic pressure a brake pad can bring to bear. Simply, If you keep the brake pedal depressed hard after a hard/long stop it can warp the rotor. (NOTE: at a hard stop, as soon as possible let the car creep forward a few inches at a time so the brake pad won't be on any one spot too long, plus keep light brake pressure --only enough to keep the car from rolling). The warped rotor causes the brake pad and caliper to float too far from the rotor and you won't feel the shimmy until you apply brakes. Under brake pedal pressure each time the wheel rotates under brake pressure the rotor and caliper will rapidly vibrate a few millimeters to each side giving the sensation of a shimmy in the sterring wheel. Most of the time this can be corrected by having the rotors resurfaced( aka Turned)

Out of balance or out of round tires can also cause a shimmy but should occur at a given speed range. Warpped rotor shimmy occurs during deceleration.

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