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These washers are common with Avid/Sram calipers but I don't think Shimano calipers include them in the box.
Is your brake pad running on the braking surface correctly, or does the pad overhang the highest points of your wavey rotor? If the pads develop a lip you'll get crap braking as the lips will contact before the worn face of each pad hits the rotor. The force against the pistons is now off-centre too, so you might get weird wear and leaks inside the caliper too.
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Emyr
Matita24
The mechanics fixed my front brake using some convex/concave washers, from what I understand they are needed to make the fork and the brake plane square, but do I really need the ones he put on top of the brake ?