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SLX brakes

My SLX brakes were squealing and down on power, I replaced the rotor and pads. They were great for 3 outings, quiet and powerful braking. Unfortunately this evening they are back to squealing and spongy. Could the pistons be leaking brake fluid? Exasperated here, cleaned the pads and rotor with Holts disc brake spray but no good at all!


  • oxomanoxoman Posts: 11,735
    Sounds like you've got a leak. Check after some really hard braking for signs of leakage. Maybe they just need bleeding. Loads of tutorials on YouTube.
    Too many bikes according to Mrs O.
  • paxtergpaxterg Posts: 18
    No obvious signs of a leak but definitely some gunk around the calipers. Is this a bin job or can a leak be corrected?
  • oxomanoxoman Posts: 11,735
    If its a leak then probably best replace, I have seen calipers repaired but not always successful.
    Too many bikes according to Mrs O.
  • woodywmbwoodywmb Posts: 669
    Unusual for both calipers to go at the same time. I cleaned the internals with disc brake spray and replaced the seals but they never did stop the bike or the squealing for long enough. In the end I bought cheap Shimano calipers and they did the trick. Lasted for years. Could have saved a fortune and reduced stress by chucking out the leaking ones right at the start.
  • mully79mully79 Posts: 904
    Sometimes crud just gets in to the piston seals. its worth a full strip down and clean if you can yourself.

    You'd be amazed how much censored sticks on the pistons.
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