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Anonymous Posted on Feb 15, 2015

Why are the Rotors getting so hot on the front and rear so hot I can not touch them.

After driving and applying the brakes I've notice the rotors on the front and rear are getting so hot that I can not touch them I checked the rotors and brakes pads everything looks fine.

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Bill Boyd

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  • Cars & Trucks Master 53,816 Answers
  • Posted on Feb 15, 2015
Bill Boyd
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The rotors are doing their job by getting hot
the purpose of the brakes is to change the kinetic energy of the spinning wheels to heat energy by the friction between the pads and the rotors (discs) This conversion of energy from kinetic to heat is what slows down the vehicle and stops it . The pads have no way of staying off the discs except by the air flow that is dragged under the pad by the friction with the disc So to sum up discs get hot by converting energy and the more energy you have the hotter they get
(watch high speed race cars at night and you will see the discs are white hot or bright red )
Back discs are slightly different as they don't come on as hard as the front discs and they also are affected by hand brakes out of adjustment
IF you feel that the discs are getting too hot for the distance covered there may be a problem in that the callipers are binding on the mounting bolts (pins) and are not centralizing and hence one pad will be in contact all the time This pad will show more wear then the other pad on the same disc.

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