I’ve tried everything imaginable to silence a noisy set of disc brakes, going so far as to switch brakesets altogether. Short of that, I’ve snugged every imaginable bolt, scrubbed the pads and even applied a small patch of Dynamat to the rotor’s spider. About the only thing’s that worked somewhat was when I used a metal file brush to clean the rotors.
Morgan Blue has heard the collective annoying squealing all too clearly and come up with a solution. It’s called Brake Silencer Paste, and it goes on the brake pads.
But not that side of the pads. It goes on the back of the pads between them and the pistons, taking up any space and quashing the vibrations that tend to howl. It’s a non-corrosive product that they say holds up to heat and stays put for a long time.