At 6000 miles, my brake rotors were warped, causing severe pulsation. GM replaced them at that time. 6000 miles later, I am back to the same problem. I do not drive this car hard, and I find it difficult to believe that the rotors cannot withstand normal daily driving. GM will not replace them again. Does anyone know if the Delco slotted, and drilled rotors will fix this problem? Also, can I spread the calipers (without bleeding) and not cause damage to the antilock system?

Jamn

 

Jamn, that's your problem your not driving the car hard enough!! :nonod:

Just kidding, but I do not think that the slotted/dirlled rotors will help, if anything they should warp easier, since there is less metal in them.

You can spread the calapers (push the pistons into the calapers) as much as you want and you will not damage the antilock system or anything else. Pushing the pistons into the calapers is one of the things that must be done to change the pads. :)

My experience with other car's brakes tells me that warped rotors are many times a result of getting the brake rotors hot (like a stop from high speed or using the brakes a lot going down a hill) and then sitting stationary for a long time with the brake pedal depressed. If you have an automatic, this scenerao is a recurring possibility, even with manual trans cars many drivers will sit at a traffic light, on flat ground, with the brakes on. There are, of course, other things which will aid the brake rotors to warp, and you'll most likely hear about every one of then on this thread. I hope you can determine the cause of your warping problem. I've had my 2000 for 3+ years and 34,000 miles and haven't even come close to a warped rotor. :thumbs:

 

The most common cause of brake pulsation is improper torqing of the lugnuts :yesnod: They should be torqed to 100 ft/lbs in stages with a star pattern sequence.

Here's a couple of articles you may find interesting: http://service.gm.com/techlink/html_...4-en.pdf#dst03 http://service.gm.com/techlink/html_...4-en.pdf#dst05

 

Exactly.

 

Not driving the car hard seems to be very common among people complaining about brake rotor warpage. I drove the hell out of my first set of rotors for 4 years with at least 3 track events per year. I would go through a set of pads at each event but the rotors went through 4 years with no visible wear until I switched to racing pads. I have not experienced any brake pulsing in the almost 6 years I have owned the car. Get with the program and drive a little harder. Its a hell of a lot more fun and isn't that the reason you bought the car?

Fancy rotors will not solve the problem but making sure your wheels are mounted straight (force the rotor to be flush with the hub) and are torqued properly can make a big difference also.
Bill

 

Thanks for all of the valuable info. I will re-torque before buying new rotors. I will resurface only if I have to. I may also have to pry this car out of my wifes hands so I can drive it like it was designed to be driven. :) [IMG][/IMG]

 

Jamn, i am a member of this Forum since Sept. 1999 and as far as i can remember the first thread i posted here looked almost the same as yours. I cant believe that GM havent REALLY changed something to solve this problem. Unfortunatelly you can read posts like yours many many times here.
All of the answers above may be right and caused the warping rotors, maybe its one of those answers, maybe its a combination of all of them . . .
If you follow all of the advices above and you still got warped rotors, i do have good experience with cryo treatment of my BAER rotors (i know, they are just machined stock GM units).

See my site for more info on cryo treating.

Jochen