Magura Martas keep coming out of adjustment....- Mtbr.com
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  1. #1
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    Reputation: nixgame22's Avatar
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    Magura Martas keep coming out of adjustment....

    I have a set of 08 Marta SL's.
    They're bleed correctly, and the rotors are true (nearly new).

    When up on the bike stand, I can get them dialed it perfectly, with no rotor rubbing. However, whenever I ride the bike, the rotors will start to rub the pads after a few minutes. The calipers are certainly tight to the mounts, and everything is torqued to spec.

    The rear is much worse than the front.

    I'm thinking the pistons arent contracting back into the calipers. Is this a common issue with Marta's? Anything else you can think of?

    Thanks!
    Nick

  2. #2
    Live 2 Ride
    Reputation: Kona0197's Avatar
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    Hub flexing?
    My Bike: '18 Giant Talon 3 29er
    My Blog: http://http://kona0197.wordpress.com/

  3. #3
    Meh.
    Reputation: XSL_WiLL's Avatar
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    It's not so much the hub flexing as it is the QR unable to clamp quite tightly enough. Or the QR being flexy.

    Are your disc tabs faced? This could help.

  4. #4
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    That's a good point that I never thought of.
    They're on a new Yeti DJ, and I did have the tabs faced. The wheelset is a brand new Hope Pro II/Mavic 819 set. The front is standard QR, but the rear is a 12mm thru-axle. They're both tightened fairly well.

    Let me know if that helps. Do you think I just have a bad batch of Martas?

  5. #5
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  6. #6
    ups and downs
    Reputation: rockyuphill's Avatar
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    Can you eyeball which pads are rubbing once it starts?

    Are the pads new?

    Have the brakes been fully bedded in on this new frame?
    I'm a member of NSMBA and IMBA Canada

  7. #7
    Meh.
    Reputation: XSL_WiLL's Avatar
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    Maybe it is the fluid expanding as it gets warm, and the system is unable to compensate for the expansion.

    Level the lever, remove the resi cap, push the pistons back into their bores. This will force any excess fluid out of the system.

  8. #8
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    Quote Originally Posted by XSL_WiLL
    Maybe it is the fluid expanding as it gets warm, and the system is unable to compensate for the expansion.

    Level the lever, remove the resi cap, push the pistons back into their bores. This will force any excess fluid out of the system.
    Could be, that's great advice. I'll give it a try. Yesterday was the first day I've ridden it (new frame, wheels.....used brakes and other parts).
    I wouldn't say it's due to warmth. It's been low 40's lately and a blizzard today here in Colorado.

  9. #9
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    hydraulics are not very good in this cold - arthritis or something. One reason I am at least considering BB7's on my new build - though I know the braking quality is no where up tot he standard of the Maguras. My XTR's were nearly useless below 40 deg.
    bikeone

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