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  1. #1
    Master Gardener
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    May 2005
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    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
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    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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