I bought 2 brand new front rotors (Brembo OE replacement rotors) for my
99 Grand Am. Turns out both of the rotors were warped. Tire rack
wants a run-out measurement before they'll give me a RMA number. I
allready spend a whole weekend fooling with these things. I had a
technician put them on a lathe to determine they were warped, he told
me there is no reason to measure the runout -- the runout mesurements
are some different. I don't want to have to bring them back. What
would one actually measure when checking for runout? What's a typical
runout measurement of a bad rotor I can give these clowns at Tire rack
to get an RMA number?
Also, what are the chances of getting two bad rotors. I'm quite
certian I didn't warp them myself (due to over torque) as I've replaced
several rotors before w/out this problem. The bad rotors caused a
brake pedal pulsation and violent shaking of the front end of the car.
Never had this problem before.
Mike Romain - 18 Apr 2006 20:10 GMT
Do you own a torque wrench?
If not, then it is very likely you caused the damage. These newer
rotors are total crap that cannot take being tightened on with a free
hand or impact gun.
The Tire Rack warranty company likely wants to blame or eliminate either
you or the vehicle for the trouble. The runout is how much slop there
is in the whole assembly. If the runout is bad, the uneven braking or
pad rubbing that can happen can overheat the disks and warp them. Are
you sure your wheel bearings are still ok?
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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> I bought 2 brand new front rotors (Brembo OE replacement rotors) for my
> 99 Grand Am. Turns out both of the rotors were warped. Tire rack
[quoted text clipped - 12 lines]
> brake pedal pulsation and violent shaking of the front end of the car.
> Never had this problem before.