Anti-Lock Brakes - Computer-controlled brakes that will not "lock" and permit wheels to skid.

Caliper - The component that houses disc brake pads on both sides of the brake rotor and are forced together through applied brake fluid pressure to stop the rotor from turning, thus stopping the car. It is also the name of a tool to measure small inside and outside diameters.

Compressor Wheel - Fan-like wheel that forces air, under pressure, into the engine's intake manifold.

Double Lap Flare - Approved method of preparing steel fuel lines for connection.

Heel - The wide part of a gear tooth.

Helicoil - Spring steel insert used to repair damaged internal threads.

Input Shaft - Metal shaft that transfers motion from the engine (via the clutch) to the transmission.

Service Manual - Book with detailed information on specific car repairs. Also called a shop manual.

U-Joint Alignment Marks - Scribed marks made on u-joint components before disassembly, allowing the joint components to be reassembled in the same positions to avoid possible imbalance and vibration.