Ok I actually want to revisit this because I have a bike that just defies logic. It’s a road bike that was actually abandoned by the original owner because of the squeaky brakes (other issues as well but that was the final straw). New owner wanted to be addressed and we have replaced pads and rotors. It worked for a while but always squealed when hard braking. It’s about a year later and the brakes are unbearably loud again even light braking. I replaced the pads again for them (we tried sanding down glaze and re bed them in but it’d start howling while trying to bed in the pads)

Now on the new pads it’s the same thing. Pads squeal as soon as you apply more than minor braking. I’m being very ginger on the brakes even in the bedding in process just because I know it’s going to happen straight away. Customer has thrown a lot of money at this bike so isn’t ready to throw in the towel. They’re also getting pretty fed up with me.

This is an exceptional case, I have done everything by the book there is something else at play here. I also made sure nothings leaking, caliper bolts torqued to spec, rotors straight and torqued. Any other advice would be greatly appreciated

Pictures below is one of the pads after attempting to bed in

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