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Will the new pads be knackered or can I clean it all up?
the only reliable success i've ever had with badly contaminated disk brakes is:
remove rotor, clean thoroughly with disc brake cleaner, clean with flap sandpaper disc on angle grinder, clean thoroughly with disc brake cleaner, clean calliper with DB cleaner, replace pads with new, reinstall rotor.
if you're prepared to go through these steps multiple times you can try and clean your pads by using all the tricks, hot water, sandpaper, DB cleaner, rinse repeat but every time the rotor gets contaminated I found you have to start the cleaning process again. So i will normally just go for new pads after decontaminating the rotor.
My front disc brake is crap. Squeeky and very poor stopping power. It's been bled recently. I changed the pads but there was no improvement. I assume I've been too careless spraying silicone spray.
Will the new pads be knackered or can I clean it all up? They are the metal type pads not resin.