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Road disc brake problems

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  • August 1, 2017 at 9:47 am #27431
    SteeveB

    I need some help with my disc brakes!

    I am having a lot of problems with contamination of pads/rotors. Not really sure why but i now have two noise and vibration devices rather than brakes. The brakes are RS805’s from last year.

    Last night i sanded all the crap off the rotors. Got them nice and shiny. Sanded the pads  (they are the standard shimano ones that come with the brakes). Got them quite shiny. Cleaned everything with isopropyl alcohol (again). All went bad  when i cycled to work.

    Fixing the rotors is easy; just need sandpaper and elbow grease. But the pads are more of a problem.

    I have seen on some forums that people heat their pads to clean them. Anyone got any tips on this – how to do it? what temp to use? Does it work?

    Dont want to buy more pads if i can help it. Last lot are only a few months old.

    Never had a single problem with my MTB discs but the road ones are turning out to be a pain.

    SAB

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  • August 1, 2017 at 10:58 am #898569
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    gonedownhill

    A mechanic told me to put the
    A mechanic told me to put the pads face up in a small puddle of isopropyl, set it alight, rub down with Emery paper and then repeat the fire bit and they should be good. I bought a new pair due to being time short before an event so can’t testify as to whether this works.

    Only contaminated when I had to lube the sides of the pistons as they were sticky

    August 1, 2017 at 10:56 am #898567
    0
    Anonymous

    Vibration sounds like large

    Vibration sounds like large disc run-out from being warped or lumpy deposits.

    Pad wise, I only get squealing in wet weather if I haven’t cleaned the pads for 3/6 months.

    I rub the pad faces against each other under the tap with some washing-up liquid as a degreaser.

    Keep rubbing until there is no mucky paste left.

    The pads then get wiped with alcohol and refitted.

    I’d be concerned that uncontolled heat may detach the pad material from the carrier.

    August 1, 2017 at 10:47 am #898565
    0
    the infamous grouse

    domestos on the rotor braking

    domestos on the rotor braking surface. rinse. dry.

    window cleaner (acetic acid) on sintered or semi-metallic pads, let soak, wipe the glaze and muck off. rinse. dry.

    bed everything back in.

     

    my commuting bike is generally fine until there’s a heavy rainfall after periods of dry weather, and then there’s the sense of the pads just sliding instead of adhering.

    August 1, 2017 at 10:35 am #898563
    0
    sergius

    How are you contaminating

    How are you contaminating them do you think?  I’ve got over 10k km on my set of Ultegra disk brakes and have only had to replace the pads once due to wear – I’ve never had any contamination issues.

    From a maintenance PoV:

    – Never use spray oils anywhere near the brakes, tbh I don’t use any at all on that bike.

    – I use wax rather than oil on the chain, much cleaner and easier to maintain.

    – it’s Di2 which might help, but I limit myself to a drop of wet lube on the moving parts of the FD/RD, let it soak in a bit and then wipe the whole thing down to remove any excess

     

    I’m afraid I’ve nothing much useful to add on fixing contaminated pads; the one time I got dot4 fluid on my pads on the MTB when I cocked up some maintenance, I ended up replacing the pads.

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