Quote:
Originally Posted by ovekvam
All the cars I have owned have had rusty brakes if I leave the car overnight with wet brake rotors. It takes one hard braking to remove the surface rust.
Rotors actually becoming warped is very rare. When they appear to be warped, it is usually buildup of brake pad material. This can typically be removed by running a brake pad bedding procedure.
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Warping is more likely if you are in the habit of staying on the footbrake after coming to a stop. The pads in contact with the friction surface creates a hot spot and over time any weak points in the disc get stressed and the disc will deform.
Something I was thinking about whilst driving an auto loaner, I found myself sitting on the brake quite a bit in urban driving. I suppose it's not as much of a risk due to the low speeds but still can't be good for the discs long term.