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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old March 10th, 2012, 16:43   #1
alloutdoorsboy
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Default How hot should your brake discs be after driving??

Just curious as to how hot other folks rotors get whilst driving?? I checked mine mine after getting home today, very minor braking on the way home and all 4 rotors were too hot to hold your finger on. Is this normal?
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Old March 10th, 2012, 17:14   #2
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Should be. The pads make contact albeit lightly all of the time. There's going to be heat and the fact that you cannot hold on to it means it's, what, 130 - 140 degrees? Too hot to handle but not at all "hot."
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Old March 10th, 2012, 17:58   #3
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This low highway MPG is driving me nuts!! So I just went out and got on a highway and drove for 5 mins at 60mph without using brakes and came to a stop on an incline without using brakes. Rotors felt cool, guess just slowing down a bit to turn into my driveway does heat the rotors that hot. OK on to other things.....Guess the injector pump is next....
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Old March 10th, 2012, 18:20   #4
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Ive personally had one bad caliper. after driving three corners were too hot to touch, the bad one, the heat could be felt 3 feet away, and the whole rim was hot to the touch.

That was on my 95 pathfinder, not my jetta

Brakes can get very very hot under normal use as all that is slowing you down is friction between a ceramic pad and a metal rotor, in which friction translates directly into heat.
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Old March 15th, 2012, 10:17   #5
lucho
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Sorry to hijack the tread but.
my front driver side rotor gets very hot, changed caliper , hose, rotor & pad.
help !!! going nuts.
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Old March 15th, 2012, 10:56   #6
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I received a nice second degree burn on my leg from my rear disc on my bicycle, and both rotors will boil water off of them after anything but mild downhill runs.

A 4000lb car requires a whole lot more energy to stop; if there's no smoke or burning smell there's nothing to worry about.
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Old March 15th, 2012, 11:21   #7
Jettascuba
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Remember... to stop a vehicle kinetic energy is converted into heat, mostly in the brake pads and discs... also a relative low (in machinery terms) temperature, I think, 60 Celcius, is too hot to touch..
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Old March 15th, 2012, 11:22   #8
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Jack up the rear of the car with PB off and see how easily the wheel will spin. IIRC, somebody here said the wheel should spin freely for one and a half revolutions.
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Old March 15th, 2012, 16:44   #9
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Occasionally, our cars can have a sticking e-brake cable that won't always stick. I had that on mine before changing cables. I have also read of other causes....I think vacuum booster issues maybe.
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