I was out riding a very rocky steep trail on Saturday....near the bottom my front brake starting making the once a revolution click click...

Anyway I finsh the ride and check it out....

A rock had bounced up and lodged in the rotor...then the rock hit the caliper and sprang out...

The rotor had a nasty dent in it that was making the click click....anyway I filed out the dent and everything is good...straight and true.

Good old Shimano brakes.....