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I have a shimmy i think in the back whe i apply the brakes at road speed and all rear components look ok and are tight im thinking maybe the rotors could be warped but im not sure. what could my problem be on a 1993 lexus LS400
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if the vibration only happens when you apply the brakes then you probably have warped rotors that need replacing. however if some front end components are in very bad condition it can also cause this type of condition as the front end will vibrate due to the excess play in the components.
Check your rear Emergency brake shoes inside the rear rotors. When the brake lining falls off of the metal backing, the linings get ground up inside the rear rotors. The pulverized lining coats the ABS count sensors and the vehicle thinks both rear wheels are turning at different speeds.
That is when automatic anti skid kicks in. The brakes try to stop the spin of the fastest wheel and intermittently applies the brakes.
Remember there are 2 sets of brakes on each rear wheel. The calipers are visible but the drums are concealed as part of the rotor housing.
If you feel the pulsation in the wheel than its the front rotors that are likely warped. If you feel it in the seat than its the rear drums or rotors.
If you don't feel it until you push on the brake pedal than it has to be in the brake system.
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I think you should get the Tierod ends checked. When you get a Front-end alignment, the mechanic will check them. Although you turned the front Rotors, when you start Braking the front tires can wander differently than when they freewheel.
Sometimes you can get a rust problem on the Rotors that were just made shiny. Moisture on the pads imprints a rust blotch on the Rotor and they grab at the rust until the rust wears down. Then they are ok.
When the rear Rotors were replaced check your bill and see if the Emergency brake shoes were changed. The E brakes should have been adjusted when the Rotors were replaced. The Shimmy you describe can also be the ABS working. The ABS is a pulsating Brake action.
Get your front-end checked first, then as the mechanic road tests it when the Alignment is complete, he can judge the brakes.,
if you have warped rotors and brake gently you may not feel the shimmy,but will if braking hard.i would fit new rotors and while the wheels were, off also adjust the wheel bearings, if needed.that way you have elliminated two of the most common causes of shimmy.
If your tires were not properly balanced then it will cause that. Also, if your rotors are warped then icould cause this to happen. YOu would also notice it when braking if rotors are warped.
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.
I believe you need your disk brake rotors turned to be true again or have them replaced. Whe you use your brakes a lot and kit puddles of cold water then it will warp the rotors which will cause the violent shaking. You may not feel it in the brake pedal even if it is warped rotors. If you don't think you have warped rotors then you should be very careful driving it because it will probably be in the steering sector arm or the idler arm on the steering shaft.
Dale
Sounds like warped rotors and worn pads or a worn front end or both. Most shops will check this for free I believe. If it were something like wheel bearings, or rear end you would likely notice this at lower speeds as well with out the brakes being applied. So the direct answer to your question is "Maybe, maybe not". Gee, that was helpful was'nt it?
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