What is or causes the rotor to warp?

Question:
i know a few things that causes the rotors to warp like, heat, improper torquing and material used on brake pads. But What else that might possible affect the rotor to warp???

Answers:

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I had one warp once due to very hard braking right before I slid into a deep puddle. The rotors were hot then got some *very* cold water on them before they had a chance to cool off. Warped the damn thing to hell.

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Your calipers may need rebuilding or replacing. If faulty, they would cause drag and the heat generated will warp your rotors.

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Hard braking causes rotors to warp due to the heat involved, but they wouldn't warp if they were engineered for the severe conditions of the application.

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But because the goal on performance bikes is weight reduction, often corners are cut on heavy things like rotors.

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You can try to get them surfaced to get rid of the warpage, but 99 times out of 100 they'll tell you that either the warpage is to severe, or the material the rotor is made from is surface hardened and they can only be surfaced a minute little bit before they have to be replaced.

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technically if you hit something with it hard enough it could i think.

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#1 is heat though. its hard to damage one by improper torquing or the brake pad material.

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Very important you know the brand you're using. Never assume rotors of any brand to be your life-partner. Some are not SIRIM approved. Only use brands recommended by manufacturers.

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Most of my experiences with warped rotors are from sticking brake calipers causing the rotor to overheat. Clean and inspect your calipers to see if they are working properly, leaving the correct space when released between the brake pads and the rotor. You may need a new caliper.

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Excessive braking, riding the brakes through town or on a downslope.
too much heat.

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One of the main causes is a defect in manufacturing. A variance in the rotor's thickness by .1mm around its' entire circumference will not be noticeable for many, many miles. However, down the road it will wear even more uneven and you will get ever increasing vibration

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Heat, with misalignment of caliper to disc.
A floating disc will not heat warp as much or as easy as a non floating disc.

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Excess heat or impact.heat is #1

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Sticking calipers...time for a caliper rebuild!

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