i just got my my front brakes done on my 03 grand prix with new rotors now my car vibrates over 60 mph why?

Answer 1

2 things here.

Even brand new rotors need turning, ever so slightly. There are almost always Small defects from the way they are made, usually only a few small spots get shaved down to match the rest. A professional place should have turned the rotors.

Also, did they replace the calipers? Alot of times after removing them the calipers can start to stick out more than usual. They are what tightens up the pads to the rotor when you hit the brake pedal.

And, every time you remove a tire, you can throw the balance off. Having removed both from tires, both rotors, you most certainly should have had both tires balance, and a front end wheel alignment, which balances the left to right as well as the top to bottom. Very important.

One other thing, not having proper air pressure can make a car vibrate. I had a car with 1 front tire that had just a few pounds more than the other. Didn't notice a thing until 65 mph, at which point it would start bouncing like a basketball, no joke.

If you just had them done, at a reputable place, take it back, and insist that something is wrong, and ask for a wheel alignment, tire balancing, and check the pressure in all 4 tires. They should drop what they are doing and take care of you immediately.

Hope you get it worked out,

Take Care

Answer 2

When the new rotors were put on.it may be possible that dirt,rust,or something is between where the rotor mounts to the hub which would cause the new rotor to have excessive lateral run out,then the tire/wheel assembly was installed over that, causing the out of balance condition.make sure the mating surfaces between hub to to rotor,and rotor to wheel assembly. is clean and properly installed and that the wheel is torqued to spec's and is not loose.

Answer 3

Vibration at speed is almost always balance of the tires and wheel assemblys. Bent wheel bad tire shake much slower speed. First thing remove the plastic lug nut covers by hand then tighten the wheels to 90 lb.ft. with a torque wrench or just make sure it is not a loose wheel try tightening with lug wrench. Rotate and reballance the tires every 7,500 miles for best tread wear anyway.

Answer 4

I would think that it is a tire balance problem, but it is possible that a rotor is out of balance. Also I would check to make sure that all the wheel nuts are torqued to the proper specs and the wheel was installed properly

Answer 5

First two answerers are likely correct.

In the future, turn down the radio and listen for yoru brakes squaling. It's much less expensive to change brake pads than pads AND rotors!

Answer 6

this is one thing people have a hard time grasping but pay attention.........vibration while driving=a tire is out of balance or a tire is seperating.......vibration while braking=a problem with the brakes.........so ask your question again to yourself the car vibrates while driving or while stepping on the brake pedal?

Answer 7

You probably need to get a Front End Alignment

Answer 8

Sounds like the new rotors are either unbalanced or warped. Don't let it slide...get the rotors re-replaced pronto...

Answer 9

It is called alignment and wheel balancing. If that isn't it you are screwed and have a twisted unibody. You didn't say what year it is and did you buy it new, or used and have you abused the car?

Answer 10

maybe there's something else wrong with it. My sister's car we keept working on it. You know what it might be breaker fluid!