Mechanics and Fixing Any Questions Answered

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Netakure in reply to @dglshrn

Rotors should be about the same width I think. You need to open pistons fully and center it very carefully, not a lot of clearance with these brakes when all is new

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dglshrn in reply to @Netakure

It's fine with a worn (1.6mm) Shimano rotor, just not a new one. They do all appear to be about 1.8 new though. Will swap the pads and see if that helps. Wonder if the spring isn't pushing the pistons back enough/opening the pads enough. It's a very, very slight rub so must just be catching.

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Netakure in reply to @dglshrn

Try to open bleed ports at lever and open pistons, sometimes they're overfilled. Check the rotor is perfectly straight, sometimes they aren't even when new. The spring does a lot of noise if badly installed.
You can also try to play with the reach, less reach = more travel and less rub

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