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  1. #1
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    What is building up on my rotors

    I have been commuting and riding in very cold snow, and salt, that is now melting to add muck to the mixture.

    The city uses some urea and CaCl to deice the roads and paths.

    My rear and front disc both lost much of their braking power and developed a very shiny black coating on the rotor.

    Last night I fried the front pads to get better power, got smoke off the pads.

    Today great power.

    Any ideas as to what is causing this build-up.

  2. #2
    conjoinicorned
    Reputation: ferday's Avatar
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    no idea jeffscott, but i've notice the same thing on my road use bike. i've been sanding the rotors/pads to get the coating off, kind of a PITA!
    what would rainbow unicorn do?

  3. #3
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    Thanks I guess that eliminates something coming from my bike,

    and indicates its coming from the roads.

  4. #4
    Double-metric mtb man
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    Yeah, Jeff, it is likely from the roads.

    You'd be surprised how much junk gets onto the street and can be baked on the rotors. Could be a combo of organic matter, salts and other items.

    My rotors don't get black, but they certaily lose their lustre (and I'm riding in the same stuff you do).
    As if four times wasn't enough-> Psycho Mike's 2013 Ride to Conquer Cancer Page

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  5. #5
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    Okay, so it is from the roads, was no there as much last year and smokes when heated to 7 on a frying pan.

    Urea used a de-icer on the paths and roads.

  6. #6
    Double-metric mtb man
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    Yeah, we had less snow last year so there was less de-icer used. Also, the city has been doing more with chips....but the type of weather that we've had has reduced their effectiveness (they melt into the ice or get covered by melt and then when things freeze you don't get any traction).
    As if four times wasn't enough-> Psycho Mike's 2013 Ride to Conquer Cancer Page

    Moran? Let your opinion be free -> F88me

  7. #7
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    Yup, buddies got it too, he going to fry his pads tonight.

    BTW newly fried pads seem to take the layer off the rotor ,casue mine cleaned up.

    I hope this is less than once a week.

  8. #8
    Double-metric mtb man
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    Isopropyl is usually all I need for the rotor... I don't like frying the pads if I can avoid it.
    As if four times wasn't enough-> Psycho Mike's 2013 Ride to Conquer Cancer Page

    Moran? Let your opinion be free -> F88me

  9. #9
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    Isopropyl wasn't even close to getting this stuff off.

    I used think frying pads was bad too, but it worked, and unless the life is impacted (iwill know by end of May)

    I might start doing it more often.

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