Hi all! Had a pulsing brake pedal on ride home yesterday (after full day in the woods), & discovered that 2 of the 'buttons' were missing from my rear brake rotor, & a 3rd one looks like it's about to fail (see pics). Anyone else ever have this happen? I've had loads of bikes with floating rotors & never seen this before . The bike's a 2016 with about 18k kms & 370 hours. Normal wear & tear, or defective rotor? I've only had the bike since last fall; I presume this Galfer disc is not original equipment.