I was riding on the weekend on pretty long trail (2000 meter altitude) and in the brakes started pretty early with a squeaking sound. I kept going and mid trail the sound became more metallic and when stopped I smelled a smell of burned brakes. Even the rider behind me told me the sound is got worse.
All in all the disc is pretty dark black and the sound got no better even after removing the pads, sanding them. I found no obvious signs else – the wheels turn well, no bend disc or touching brake pads…
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What happened before the weekend, that might have effect:
– I bled the brakes and made a mistake: forgot the spacer and a piston got pushed out leaking brake fluid. Did multiple cleaning with isopropyl alcohol and bled twice. Not sure if that has an effect.
– I changed the screw holding the brake pads as the thread was used. The screw were not identical (thicker where they meet the pads) and might have slightly changed their angle of attack – I did not burn them in again.
– I haven’t riden for half a year – I might have stepped a bit to often on the rear brake.
Thanks any suggestions what could have gone wrong and what I need to do. Sintermetal pads, new disc?!?
by bikesailfreak
2 Comments
I think you just have been on that break for a lot of time during your ride, probably over heating issue
Reading your full description I would say you probably contaminate the disk pretty badly and even though you cleaned it…. it most likely will not go back to what it was instead of wasting a bunch of time trying to clean it. I would just get a new disc and pads and call it a day….. also I would double check your piston seals to make sure they are not leaking especially if they got pushed out… I would clean out the calipers as best as possible. Use a bleeder block to see if any fluid is coming past the seal.