Results 1 to 3 of 3
  1. #1
    Knollician
    Reputation: tiSS'er's Avatar
    Join Date
    Jan 2004
    Posts
    3,213

    Bonking ... not feelin' well Problems with Marta's, need help!!

    this is an email I sent off to magura today, has anyone had problems like this and have any resolutions?

    I purchased Marta SLís 2 weekends ago and completed my 3rd ride on them today. The problem I am having is that the rear brake vibrates violently (high frequency, not like a warped rotor). This problem started on my second ride, my first ride did not require much braking. It vibrates so bad that on a ľ mile downhill, my feet, legs, and torso went numb from it. It also squealed horribly. I went to the cult site and noticed that some noise may be normal due to different frames. I have a Dean Colonel Xlite SS, King ISO rear hub with bolt-on axel. I live in Phoenix Arizona, so the weather is dry and dusty. I have no problems with the front brake.

    I have tried the following things from the cult site:
    1. checked my spokes
    2. checked pad and rotor alignment-seems very good
    3. switched rotors from front to rear with no results Ė the rotors appear to be very straight
    4. sanded the brake pads, there was no glazing on them
    5. placed rubber washers on both sides of the bolt

    No results!!
    Previous to these brakes I had Hope miniís with no problems at all.

    I really like the power of these brakes and I need to get a solution to this problem. Again, the problem is not minor. It is severe. In a very short braking span, the bike vibrates very badly. Thanks for your help.

  2. #2
    Bodhisattva
    Reputation: The Squeaky Wheel's Avatar
    Join Date
    Dec 2003
    Posts
    9,573
    Have you faced the brake tabs?
    Find a shop with a gnann-o-matt or similar tool & make sure the frame ISO brake tabs are faced & parallel. I don't know if that will solve your problem but it's a good place to start.
    Life....the original terminal illness

  3. #3
    (aka SS_MB-7)
    Reputation: 1speed_Mike's Avatar
    Join Date
    Jan 2004
    Posts
    924
    Quote Originally Posted by The Squeaky Wheel
    Have you faced the brake tabs?
    Find a shop with a gnann-o-matt or similar tool & make sure the frame ISO brake tabs are faced & parallel. I don't know if that will solve your problem but it's a good place to start.
    Yep, first thing to do is get the fork and frame tabs faced with the Magura (or other) tool.

    Second, sometimes (unfortunately) vibrations are just a problem with the entire system: frame, wheel, brake, etc. Every system has a natural frequency, that is, the frequency at which things will vibrate. I had a similar situation with my Seven Ti hardtail and some Hope discs. I was able to eliminate the vibrations by changing the natural frequency of the system. I did this by installing some thin nylon shims between the disc caliper and the frame. This helped to isolate the brake from the frame and changed the natural frequency of my bike. Vibs gone!
    Ride Hard,
    Mike B. (MCM# 7.77)
    http://www.one-speed.com

Similar Threads

  1. Anyone else have problems with XT 760 Rear Derailluer?
    By kristian in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 6
    Last Post: 08-31-2004, 02:29 AM
  2. Tomac problems
    By shadfly in forum Bike and Frame discussion
    Replies: 14
    Last Post: 06-19-2004, 09:36 PM
  3. Help! Any problems with this combination?
    By old_dude in forum Drivetrain - shifters, derailleurs, cranks
    Replies: 5
    Last Post: 04-16-2004, 08:18 AM
  4. Big Rotor Retrofit for Magura Martas
    By BigDigger in forum Brake Time
    Replies: 4
    Last Post: 03-31-2004, 10:25 AM
  5. can i use shimano adaptors with martas........
    By maynard in forum Brake Time
    Replies: 1
    Last Post: 01-15-2004, 03:36 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •