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Thread: Rear Brake Rotor

  1. #1
    Registered User
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    May 2004
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    Hurley, WI
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    Rear Brake Rotor

    Hello- Have a 2000KLT with a few grinds in the rear rotor (1st set of pads wore out quicker than i would expect). Have gone to EBC sintered pads, but rear brake still doesn't seem good. Has anyone ever "turned" a bike rotor to smooth it out? Where was it done? I'm hoping this may improve braking.

  2. #2
    A bozo on the bus deilenberger's Avatar
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    Mar 2003
    Location
    Spring Lake NJ, USA
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    Re: Rear Brake Rotor

    Originally posted by rocker
    Hello- Have a 2000KLT with a few grinds in the rear rotor (1st set of pads wore out quicker than i would expect). Have gone to EBC sintered pads, but rear brake still doesn't seem good. Has anyone ever "turned" a bike rotor to smooth it out? Where was it done? I'm hoping this may improve braking.
    I don't think you'll find too many places that can turn a motorcycle rotor (although I have heard of it being done on Ducati's)..

    Reasons being:

    1. Hard to mount in any normal brake lathe

    2. Already thin - to remove any meaningful amount - you'll be down at the minimum thickness.

    3. Chatter - the holes in the rotor tend to make them chatter when being turned.

    I've BTDT with no success. Tried an early K bike rotor in an automotive brake lathe - chatter made it unusable, plus the tooling on an automotive lathe doesn't like the stainless steel that K bike rotors are made from. I also tried having one ground - with a "Blanchard" grinder (a rotary flat surface grinder) - the parallelism specs of a Blanchard grinder are +/- 0.001" - seems very good - but it can lead to thickness variations of 0.002" - which will make the brakes unusable (BTDT also).

    Best bet - try for a good used one. Several places advertise in the MOA-ON who do used BMW parts. Or look on the IBMWR marketplace.

    Best,
    Don Eilenberger http://www.eilenberger.net
    Spring Lk Heights NJ NJ Shore BMW Riders New Sweden BMW Riders
    '07 R1200R (current ride) and some bimmers.. and a Porsche

  3. #3
    bmwmick
    Guest

    Re: Rear Brake Rotor

    Originally posted by rocker
    Hello- Have a 2000KLT with a few grinds in the rear rotor (1st set of pads wore out quicker than i would expect). Have gone to EBC sintered pads, but rear brake still doesn't seem good. Has anyone ever "turned" a bike rotor to smooth it out? Where was it done? I'm hoping this may improve braking.
    rocker,
    Does your rear disc just have some grooves in it? How many miles do you have on your new pads? If the rear disc is grooved, it will take a few miles/medium -hard stops to seat the new pads. They have to wear to match the pattern on the disc. The brake pedal will feel spongy until they seat too.

    Mick

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