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  1. #1
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    How hot have you ever gotten your brakes?

    Has anyone been going down a long steep hill and something happens? (smoking brakes or bad smell or something) What happens if they get too hot?

  2. #2
    I am a pathetic rider...
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    If they get too hot, the most immediate and noticeable thing that happens is your brakes pump up and fade. If they get hotter than that, the pads may glaze, leading to a semi permanent loss of power, until you get a hold of some sandpaper.
    Save the Earth, Ride a Cyclist

  3. #3
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    Im not sure what pump up and fade means really.

  4. #4
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    Quote Originally Posted by drain bamage
    Im not sure what pump up and fade means really.


    Fade mean the brake lever goes soft or mushy when you pull it, and there is a decreased braking power and/or strength.

    I have heated up brakes to the point the rotor could sizzle water and it burnt my finger, and on another bike faded to the point of having almost no brakes.

  5. #5
    Big Gulps, Alright!
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    I've heated up discs where they'll burn your skin pretty nicely (called rotor burn) and the rotors turn colors.
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    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  6. #6
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    I've gotten my 7" front brake glowing on a night ride when my rear brake died. It was pretty sketch.
    .

  7. #7
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    don't know how hot but 30 minutes after a ride and I was cleaning my bike, fingers got to close to the front rotor and it burnt me. It has been about 4 months since and I still have a scar.
    2009 Trek 6700D

  8. #8
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    I was taking a breather after a long descent and I could not only smell my brakes from about 10 feet away, as I approached my bike I could feel the heat of the brakes from a few feet away........rotors were blue. Shortly after that I switched to larger rotors........= )
    Look, whatever happens, don't fight the mountain.

  9. #9
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    NICE. i have heated mine until they could sizzle water as well :-P

  10. #10
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    You guys use your brakes way to much

  11. #11
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    Quote Originally Posted by steveo555
    ...30 minutes after a ride and I was cleaning my bike, fingers got to close to the front rotor and it burnt me.
    30 minutes later?...

  12. #12
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    Quote Originally Posted by AzSpeedfreek
    Fade mean the brake lever goes soft or mushy when you pull it, and there is a decreased braking power and/or strength.
    Mushy or soft brake lever is only one type of fade... it indicates the fluid has gotten too hot. I've never experienced this type of fade.

    However, I have experienced mechanical fade in which the pads/rotors became too hot. My levers felt great, but there was little to no stopping power left. It happened after an entire day of DH; on the last few runs, my brakes were cooked.

  13. #13
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    I've discolored a rotor and turned the backing plate blueish purple.

  14. #14
    ride hard take risks
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    Quote Originally Posted by Arek
    30 minutes later?...
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  15. #15
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    The most I have done to my rim brakes is get them luke warm when going downhill or just pedaling really hard while on the brakes. Rim brakes dont get nearly as hot as disks

  16. #16
    MONKEYMAN
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    Mine were so hot I pulled the front wheel off the bike and boiled a pot of water for a nice linguine dinner with chopped bacon and peas. Had an onion tied to my belt the whole time. Good times.
    “I don't like jail, they got the wrong kind of bars in there”

  17. #17
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    Quote Originally Posted by finger51
    Mine were so hot I pulled the front wheel off the bike and boiled a pot of water for a nice linguine dinner with chopped bacon and peas. Had an onion tied to my belt the whole time. Good times.
    Whoa, that's what I had for dinner last night! However, the water was boiled in a more conventional manner.

  18. #18
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    Quote Originally Posted by rmccully
    Whoa, that's what I had for dinner last night! However, the water was boiled in a more conventional manner.
    The heat from an old single-pivot road bike caliper and sew-up rim?

  19. #19
    Shortcutting Hikabiker
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    Quote Originally Posted by steveo555
    don't know how hot but 30 minutes after a ride and I was cleaning my bike, fingers got to close to the front rotor and it burnt me. It has been about 4 months since and I still have a scar.

    Bulllll****

  20. #20
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    No you silly, he ate the onion tied to his belt. *pictures a twisted version of the hanging apple game from halloween*

  21. #21
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    Quote Originally Posted by scottzg
    I've gotten my 7" front brake glowing on a night ride when my rear brake died. It was pretty sketch.

  22. #22
    Double-metric mtb man
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    Well, I've had the floating rotors on my brakes making all sorts of cooling pings after some faster runs while doing some park riding... but I haven't been able to full on cook them yet


    My previous brakes were faded out a few times on lesser trails...the reason I went to bigger rotors and then better brakes.
    As if four times wasn't enough-> Psycho Mike's 2013 Ride to Conquer Cancer Page

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  23. #23
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    Originally Posted by steveo555
    don't know how hot but 30 minutes after a ride and I was cleaning my bike, fingers got to close to the front rotor and it burnt me. It has been about 4 months since and I still have a scar.
    Bulllll****
    I am serious dude, the 15-30 minutes was the bike on the rack driving back home. Pulled out the garden hose and started to spray down the wheels, cleaning spokes with my hand and the edge of the disk burnt my knuckles on my hand. I still have red triangle shapes burnt on my hand from the edge of the avid disk. BTW I am using Juicy 3's so I do not know if they are the best at cooling off.
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  24. #24
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    Bicycle disks are too small to retain that much heat. Short of 5lb+ rotors or melting them into a liquid puddle, they would be cooled after 15 minutes, especially with the airflow from driving. And no, it doesn't matter how hot they were, they'd still be cool.

  25. #25
    I Love my Rize
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    Gotta call ya on that one

    Quote Originally Posted by steveo555
    I am serious dude, the 15-30 minutes was the bike on the rack driving back home. Pulled out the garden hose and started to spray down the wheels, cleaning spokes with my hand and the edge of the disk burnt my knuckles on my hand. I still have red triangle shapes burnt on my hand from the edge of the avid disk. BTW I am using Juicy 3's so I do not know if they are the best at cooling off.
    Raising the bullsh!t flag on that one.............
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  26. #26
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    This guy got a nice rotor brand during a crash:
    功夫大师喜欢骑着他的自行车在山上。

  27. #27
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    Cheers to that.

  28. #28
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    Quote Originally Posted by comptiger5000
    Bicycle disks are too small to retain that much heat. Short of 5lb+ rotors or melting them into a liquid puddle, they would be cooled after 15 minutes, especially with the airflow from driving. And no, it doesn't matter how hot they were, they'd still be cool.
    +1 You could heat the rotor to it's melting point with a torch and in 15 minutes you should be able to pick it up by hand without burning yourself.

    Now if the bike was put on the rack on a 115 degree Phoenix day in direct sunlight the whole way home, it may burn you but that's not from braking.

  29. #29
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    The windchill from driving at even a conservative 45mph would be MORE than enough to compensate for even a 120 degree day, because surface area = more windchill... And brake rotors are designed specifically to be nothing but surface area lol.
    Now, if it was sitting atop the car in the driveway in full sun, sure... But once again, not from braking.

  30. #30
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    Could the brake pads smoke if a 400 Pound guy had his DH bike only with 120mm rotors and only used front brakes going down a big steep mountain about 5000 feet high? LOL just wondering how much heat that would be gosh.

  31. #31
    ride hard take risks
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    Quote Originally Posted by drain bamage
    Could the brake pads smoke if a 400 Pound guy had his DH bike only with 120mm rotors and only used front brakes going down a big steep mountain about 5000 feet high? LOL just wondering how much heat that would be gosh.
    Yes but not 30 min after.
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  32. #32
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    Quote Originally Posted by drain bamage
    Could the brake pads smoke if a 400 Pound guy had his DH bike only with 120mm rotors and only used front brakes going down a big steep mountain about 5000 feet high? LOL just wondering how much heat that would be gosh.
    I'm sure by then if it was hydro the brake wouldnt even work as the liquid would have boiled and melted everything and on a mech oh dear I'm sure he would have sparks by the bottom;

  33. #33
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    Quote Originally Posted by steveo555
    I am serious dude, the 15-30 minutes was the bike on the rack driving back home. Pulled out the garden hose and started to spray down the wheels, cleaning spokes with my hand and the edge of the disk burnt my knuckles on my hand. I still have red triangle shapes burnt on my hand from the edge of the avid disk. BTW I am using Juicy 3's so I do not know if they are the best at cooling off.
    Could it be remotely possible that your disc was touching near or on the exhaust?......because that would explain the heat.....otherwise im calling BS

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