The rear disc brake shoes have an anti-rattle spring attached to the rear of the outboard shoe and a wear indicator on the inboard shoe.

This typically happens during the first 10-50 stops of a brake system and is referred to as "burnishing" the rotor and pads.

Disc brake, as the name suggests, the shape is like a disc and its main parts include brake disc, wheel cylinder, brake caliper and vitta etc.