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Thread: Cannot get rid of brake drag

  1. #21
    Member GreenMeanie's Avatar
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    All of what SuziInThe Garage said.
    Build up of shit on the pistons or rust.
    Pull them out. Clean them out and through some seals at it.

    Check your master cylinder for crap.
    Make sure the piston in that is free.
    Years of unchanged fluid can build up behind it.
    It may work with the pedal but doesn’t like to return.

  2. #22
    Member wheel_of_steell's Avatar
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    Thanks for the advice guys. Quick update on the bike - brake is still dragging. Not as bad as before (getting 3-4 turns with a hearty spin when cold) but still too hot to touch the rotor after a short ride around the block. Things I've looked/done at since last time:

    -new master cylinder kit and new caliper piston/dust seals, both genuine, everything is squeaky clean especially master cylinder vent port
    -flushed through different brands of dot4 brake fluids on all three brake circuits and cycled the ABS between flushes
    -slightly enlarged the brake pad mounting tabs in case they were binding on the sliding pin (they weren't)
    -verified sliding pins and pad mounting pin are immaculate and correctly lubed with no torn boots
    -verified pistons are immaculate
    -smeared back of pads with copper grease so they stick to the pistons
    -checked alignment of front end and brake rotor
    -checked against parts diagrams for correct assembly of preload spring etc

    ???
    Not really sure what's going on here tbh
    Quote Originally Posted by devolved
    I just crashed into a schoolbus full of kiddies, killed them all, raped them, set them on fire and now I'm pissing on their charred remains.

  3. #23
    Member Doug68's Avatar
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    Do you have shorty levers installed?
    They have been a culprit in the past.

    Sent from my Pixel XL using Tapatalk
    Doug
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  4. #24
    Member BusaSteve's Avatar
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    WHS I would be checking the pivot for a build up of dried grease.....had one on the Busa a few years ago that was a pig to get out due said build up. Also what about the clevis pin on the piston end...where the lever pushes against
    Smoke me a kipper...I'll be home in time for breakfast

  5. #25
    Member agrid's Avatar
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    I thought it was a 4 piston caliper but looking at the parts diagram it appears not to be. If those slide pins get corroded it the caliper will stick. Usually shows up as the pads on one side wearing faster than the other.

    https://www.motorcyclespareparts.eu/...-brake-caliper
    -

  6. #26
    Member SomeBloke's Avatar
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    Photos?

  7. #27
    Member Goliath's Avatar
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    I had the same problem with my GS500 and my R1. In both cases the cause were non-genuine brake levers.

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