2007 Gmt900 Warped Rotors

L-Ray · March 27, 2009

Guys, just had my 07 CC in for warped rotors for the third time. Each time they have re-surfaced the rotors and it lasts for a few thousand miles. First time was at 10,000, 2nd at 24,000 and this one at 33,000. This time Chevrolet would not pay to fix the rotors, so I was out the cost of the re-surface and new pads. This truck is not used to tow or haul much more than groceries.

From reading posts here I know there has been a lot of complaints about warped rotors. The last three GM trucks I have had never had a warped rotor and they were used to tow.

So, my next step is to trash the GM rotors when they get warped again and get something of better quality. I looked at Powerslot, but they do not seem to have rotors for the GMT900. Any other recommendations?

stadt11 · March 27, 2009

http://www.powerslot.com/partsapp/details....p;categories=25

Draenor · March 27, 2009

Turning rotors is never good. The less material the less heat they can withstand.

As for the warping in general, ease up on the brakes dammit.

L-Ray · March 27, 2009

http://www.powerslot.com/partsapp/details....p;categories=25

Get - Not authorized to access the website.

When I go to the home page and select Chevy, Silverado 4wd crewcab w/rear drum brakes, it only lists 2005 and 2006. No 2007 - 2009

Ranger · March 27, 2009

Choose 4WD-ALL and it'll have a 2007.

Seems like the part # it has for that also works with the earlier 05-06s...I don't think GM changed the rotor design from the 800s to 900s.

c4cruiser · March 27, 2009

If re-surfacing didn't help, then a good service department (and dealer) would have replaced the rotors under warranty. Depending on how "warped" the rotors are, it possible that no amount of machining will fix the problem, especially for the 3rd time. At that point, there was probably enough material take off the rotor to get it to the minimum safe thickness.

Sometimes driving styles will cause warping. Repeated hard stops from high speeds can cause warping as can something as simple as not having the wheel lugnuts torqued properly.

Unless you want the look of slotted rotors, then just get some stock rotors which will work fine for the type of driving the truck gets. Raybestos Professional Grade, NAPA or Brembo stock replacements will work fine.

pm26 · March 27, 2009

Uneven tightening of lug nuts without using a torque wrench does not help either.

montecarloman90 · March 28, 2009

Wow. i wouldnt not want to cut a rotor 3 times. there had to be nothing left, and you have to take alot off if there warped.

L-Ray · March 28, 2009

Wow. i wouldnt not want to cut a rotor 3 times. there had to be nothing left, and you have to take alot off if there warped.

The told me that there was plenty of thickness left on the original rotors. I'm just tired of having the problem.

I don't think I am that hard on the brakes, this is the first GM product that I've had with this problem and I have had a few GM products since 1970.

Zembonez · March 28, 2009

No warpage problem on mine and I drive it pretty hard. Contrary to your statement that many are having this problem, I have not seen many complaint posts in here.

dkjbama · March 28, 2009

Uneven tightening of lug nuts without using a torque wrench does not help either.

Overtightening lug nuts with an impact wrench can warp them as well.

Also, by change. You wouldn't happen to have aftermarket wheels would you?

07Sierra07 · March 28, 2009

My 07 nbs max has 46000km and the rotors started causing a shake about 5000km ago. The dealer wants to charge something like 360$ to machine them.. I do brake hard sometimes and I have towed a 7000lb camping trailer.

nqabigt · March 28, 2009

Mine were resurfaced at 3600 miles (warranty)

DBVille · March 28, 2009

In all likelyhood, the rotors were not warped. The page below references another problem that is probably far more likely. The problem is that pad material is transfered to the rotor causing a localized buildup which essentially "warps" the rotor. Point here is that the rotor itsel is straight, the material causes the pulsations. Turning the rotors basically removes the material, and not much rotor material. However, if overheated, the rotor may be locally hardened, and will repeat in short order. This is probably what happens when the warp again so quickly.

It also has links to "bed" in the brakes. On our '94 Suburban my wife could "warp" the brakes in two weeks. After finding this, and bedding them in as described, it took her over a year to do it again, and I could prolong the time just by getting them good and hot again.

http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml#

c4cruiser · March 28, 2009

Wow. i wouldnt not want to cut a rotor 3 times. there had to be nothing left, and you have to take alot off if there warped.

The told me that there was plenty of thickness left on the original rotors. I'm just tired of having the problem.

I don't think I am that hard on the brakes, this is the first GM product that I've had with this problem and I have had a few GM products since 1970.

It sounds like the dealer is not really wanting to help with your problem (until you have emptied your wallet or simply let them sell you new rotors at dealer list price). Turning them three times, if the did it correctly, means they took a lot off the rotor face and the chances are that measuring the current thickness will show them to be close to (or at) the minimum safe thickness. Or they didn't take much at all off the rotors to begin with with and just told you they did.

Either way, the dealer just didn't want to install a set of replacement rotors to fix the problem. At this point if it was me, I would go buy replacement rotors and install them and then call the GM Regional Office and tell them what has gone on. Then find a good dealer if you need to have warranty work done.