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  1. #1
    Master Gardener
    Reputation: Velokid1's Avatar
    Join Date
    May 2005

    New question here. Sudden squealing and poor performance 2012 XT

    I'm sure I'm not the only one who has experienced this but I'll be damned if I can find any explanation/fix.

    I have a Black Cat with 2012 XT disc brakes. They've always worked great- love em.

    Two days ago I swapped rear cogs and in the process loosened and readjusted my rear caliper. I've done this a hundred times consider myself fairly skilled with disc brakes.

    On the next ride, the rear brake started squealing like a mother. I bet you can hear me from 3/4 mile away in the forest.

    And suddenly the performance of the rear brake is piss poor.

    The pads have about 30% life left. Plenty of material on there.

    At first I tried re-adjusting the calipers and resetting the pistons, etc.

    No improvement in either sqawking or performance.

    Then I tried cleaning the rotors with alcohol. No improvement.

    Then I tried sanding the contact surfaces of the pads lightly. No improvement.

    So I tried taking fine steel wool to the rotor surface. No change.

    So I broke down and purchased new brake pads. No change. Same squeal, same poor performance.

    So before I go purchase a new rotor, thought I'd check in and see if anyone knows a magic fix.

    Deranged in Durango.

  2. #2
    Master Gardener
    Reputation: Velokid1's Avatar
    Join Date
    May 2005
    Fixed. I'm ashamed to admit it was contaminated pads due to my banjo bolt working itself loose.

    The amount of fluid that leaked was really hard to see, I never would have thought it possible for that little amt of fluid to even reach the pad contact surfaces and because my levers still feel perfect, I let it slip right past me.

    Lesson learned today: anytime there is a sudden loss of brake power and your lever/line feels perfect, you have contaminated your pads somehow.

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