• Pffft which brakes are they? Are they still in warranty?

    Suddenly failing pads accompanied with squeaky noises is a sign of leaking piston seals.

  • BR-RS505, about 26 months old so out of warranty. I'll try brand new pads and rotors tomorrow, as there's nothing to lose even if that's not the issue (I can just stick the old pads and rotors back on there).

    If the seal is leaking, I should be able to see that visually, right? I just don't want to buy and replace calipers if that's not definitely the problem.

  • If the seal is leaking, I should be able to see that visually, right?

    You could take the pads out, push the pistons in, put the bleed block in, pump the brake up rock hard then strap the lever down tight then leave it over night. See what you come back to. The bleed block won't soak it up like a pad might.

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