When the brake pedal is depressed, the calipers press on the side of the side of the rotor. The friction pads slow the rotor as needed. Most vehicles use disc brakes on the front wheels. When the brake pedal is depressed, the brake shoes contact the sides of the can and slow the wheel. Drum brakes are usually mounted on rear wheels.
Drum brakes are prone to fade, or heat buildup, which reduces their effectiveness.
A term used to describe an engine's ability to fill its cylinders with air-fuel mixture and then discharge the burnt exhaust gases. In general, the more air-fuel mixture an engine burns the more power it produces. Bushing A simple suspension bearing that accommodates limited rotary motion, typically made of two coaxial steel tubes bonded to a sleeve of rubber between them. The compliance of the bushing in different directions has a great effect on ride harshness and handling. By-pass Valve A general term for a valve that lets liquid or air circumvent a filter.