[5th_bike]

Well mine were worn diagonally, here is what was left:

piston side, leading edge: 2 mm
piston side, trailing edge: 3 mm
other side, leading edge: 1 mm
other side, trailing edge: 0 mm (bare metal)

The latter causing a kind of grinding sound when braking :whistle:

Thanks to the posts above we now know where to look for a fix. I'll let you know how it goes.