Brand new BR-R7070 brakes, piston issue The ceramic pistons on my brand new BR7070 brakes won't depress at all even with quite a lot of force. There is also a subtle grinding noise when trying to depress the pistons. Did I somehow crack the brand new pistons? How much force does it take to depress these?
I disassembled the caliper and the ceramic pistons were both shattered. They were either shattered on arrival or this was from trying to put a bleed block in when the pistons were slightly out. This pushed the pistons into a slight angle. Then they shattered when squeezing the brakes.