Vibrating frame - disk brake problems

Parkey
Parkey Posts: 303
edited February 2008 in MTB workshop & tech
I'm having problems with my rear hydraulic disk brake (Magura Julie brakes on a Merlin Malt1). Whenever I apply medium levels of pressure to the brakes I get a squeeling sound and the whole frame vibrates. I've owned the bike for about a year and a half now, but this has only started happening in the last 3 months or so.

At first I thought it might be contaminated pads, but having swapped out the old pads for new ones I'm still getting exactly the same problem.

Does anybody have any idea what's going wrong?
"A recent study has found that, at the current rate of usage, the word 'sustainable' will be worn out by the year 2015"

Comments

  • nicklouse
    nicklouse Posts: 50,673
    edited February 2008
    have a look in the FAQ section of the MTB forum there is a topic on squeeky brakes,

    either contaminated or worn pads.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Parkey
    Parkey Posts: 303
    As I said, I thought so myself.

    The pads that are in there now are new and clean. It's made no difference.
    "A recent study has found that, at the current rate of usage, the word 'sustainable' will be worn out by the year 2015"
  • nicklouse
    nicklouse Posts: 50,673
    you did make sure the rotor was not contaminated before fitting the new pads? a good cleaning with meths. As if the pads were contamintated before so would have been the disc.

    Other posibilities are the pads not sitting flush with the pistions ´but as happened with the old....

    the caliper is aligned? the pads have had time to bed in?

    the pads are? material make?

    you could also try using an abrasive on the rotor (emery cloth or some "Wet and Dry" it can help.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Sir HC
    Sir HC Posts: 20,148
    Are the disc bolts tight ?

    Hub ok ?
    Intense Socom
    Inbred
  • wheelbuckler
    wheelbuckler Posts: 134
    Mine were doing that as well, I cleaned the rotor with isopropyl alcohol and it seemed to cure the problem
  • Parkey
    Parkey Posts: 303
    I changed the pads and cleaned the rotor with acetone.

    Still doing it.

    Tried adjusting the position of the callipers in case they weren't aligned properly.

    Still doing it.

    So, so frustrating!
    "A recent study has found that, at the current rate of usage, the word 'sustainable' will be worn out by the year 2015"

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