This vehicle had been recently purchased by a customer and was brought to us with a noise in the front while driving.
The first picture is of the brake caliper, which the bolts had loosened up and fallen out. The caliper was grinding on the inside of the front rim.
The brake rotor (the other 2 images), had been worn down through the friction surface, into the cooling fins due to a dragging/stuck caliper. The rotor had worn so much that it broke into 2 separate pieces.
Calipers can drag or become stuck from moisture entering through a damaged dust boot causing corrosion around the caliper piston, or excessive moisture that has contaminated the brake fluid. Brake fluid absorbs water which can cause problems inside the entire braking system as well. Brake fluid should be flushed every few years to keep the system operating properly.