In the side view of the car, the foremost roof support of a vehicle, located in most instances between the outer edge of the windshield and the leading edge of the front door upper.

Acceleration is what occurs when the car moves forward from a stop or a slower speed to a higher speed.

The pedal found on all cars that controls engine rpm. Also called the gas pedal.

Accelerator pumps are found in cars equipped with carburetors. When you accelerate, the accelerator pump delivers extra fuel through the accelerator pump circuit to allow the engine to deliver more power.

Refers to a power-operated feature(s) on a car. For instance, power windows and power locks would be considered accessories.

The low side of an air-conditioning system. It removes moisture from (and stores) liquid refrigerant.

An extremely sophisticated, computer controlled suspension system that uses powered actuators instead of conventional springs and shock absorbers. The actuators position a car's wheels in the best possible manner to deal with road disturbances and handling loads.

The amount of money invested in the purchase and repairs of a used vehicle. Also known as ACV, this represents the amount of out of pocket expense a dealer or broker is 'into' a car.

The drag produced by a moving object as it displaces the air in its path. Aerodynamic drag is a force usually measured in pounds; it increases in proportion to the object's frontal area, its drag coefficient, and the square of its speed.

The branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow. In car design the positive and negative lift of the airflow is studied in wind tunnels. Negative lift is preferred to press the vehicle closer to the ground. Car air resistance is also studied.

(Replacement Market) all products and services used in the repair and maintenance of vehicles.

Goods not for use as original equipment in the production of light-duty vehicles or heavy-duty vehicles, i.e. products and services used in the repair and maintenance of these vehicles. Any new repair part not produced by the original vehicle manufacturer appearance allowance: An agreed compensation from the insurance company for repairs not performed, sometimes appropriate for superficial damage.

An intermediary with legal authority to operate on behalf of the manufacturer.

The air bag, also known as a Supplemental Inflatable Restraint System, is a passive safety device, supplemental to safety belts, that inflates (a cushion hidden in the steering wheel and dashboard) to provide a cushion to absorb impact forces during moderate to severe frontal collisions. This system can help to lessen the chance of contact with the steering wheel, instrument panel and windshield. The air bag is actuated automatically by sensors located in the front of the vehicle. To maximize effectiveness, seat and shoulder belts must always be used in conjunction with this system.

The airbag system consists of impact sensors, a system computer, a detonation device, and the airbag itself.

The air conditioning system is a related group of components that cool the incoming air taken in by the car's interior ventilation system.

A front spoiler mounted beneath the bumper and shaped to reduce the airflow under the car. Air dams can increase the airflow to radiators, reduce aerodynamic drag, and/or reduce lift.

This device filters the air that goes into your engine. Without an air filter, harmful particles would enter your car's engine and cause internal wear and damage.

One method of reducing harmful exhaust emissions by injecting air into each of the exhaust ports of an engine. The fresh air entering the hot exhaust manifold causes any remaining fuel to be burned before it can exit the tailpipe. A system that injects air into the exhaust ports of the engine for combustion of unburned hydrocarbons in the exhaust gases, thus producing 'cleaner' exhaust emissions.

One-way valves that prevent exhaust gases from entering the air pump.