I have a 2007 avalanche bought new in Jan - 08. During my first oil change my mechanic noticed the break rotors were rusted with groves enbeded in them. I notified the dealer of the situation, I brought the truck to them to look into brakes. The dealer wanted to cut the rotor and not install new pads. If the rotors are junk then there is no doubt that the pads are junk as well. I refused to allow my new truck to have the rotors cut with only 3,000 miles on them. I contacted General Motors directly and they stated that this was a normal occurance. I believe the junk rotors with only 3,000 miles should have new rotors installed with new pads. What is your input on this situation.
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I'd be getting the brakes checked (or actually check them myself).
That involves getting the vehicle jacked up, removing the wheels, and visually inspecting the brake pads and discs.
PLEASE! This is a safety issue and you NEED good brakes.
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.,
Try buying top quality rotors, Raybestas, Wagner, or Bendix. Do not buy second line rotors. Buy the top line, OE quality pads. Make sure that when the rotors are installed that you clean out behind where the rotor mounts and the studs. All rust, dirt and debris needs to be removed. When you mount the wheels back on the vehicle, they need to be torched back to ford specifications, follow the specs to the letter. These trucks are VERY picky when it comes to brakes and skipping just one of the steps above will lead to trouble.
as an owner of three gmc sierras, i can attest that the brake lines that run along the frame rail under the master cylinder inherently rust away and break. I wouldnt neccesarily think it was tampered with. but do check the condition of all of the lines including the fuel lines for excessive rust.