Capri Definitions

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The roof support on either side of a vehicle, situated between the front and rear side windows. Some vehicles, such as late-model Chevrolet Camaros, are not equipped with B-pillars.


An explosion in the exhaust system of a motor vehicle caused when an unburned air/fuel mixture is ignited, usually upon deceleration. An explosion of the air/fuel mixture in the intake manifold, which is evident at the carburetor or throttle body and may be caused by improper ignition timing, crossed spark plug wires, or an intake valve that is stuck open.

    Ball Joint

A flexible joint having a ball-and-socket type of construction. Ball joints are used primarily in a vehicle's front suspension because they can accomodate a wide range of motion.


A system where the rotating motion of the engine is transmitted to wheels or pullies via a leather or rubber belt. Most modern vehicles use a belt drive system to transmit energy to air conditioning compressors, power steering pumps, alternators, and even water pumps. V-belts are simple rubber belts with a V-shaped surface which runs around the belt. Multi-V or Serpentine belts consist of 3 or more small V-shaped grooves which run around the belt, and may power all the engine's accessories. Cogged belts consist of a number of rubber grooves or cogs which run across the surface of the belt, and are commonly used to drive components such as camshafts (timing belts) and superchargers.


A trim ring, usually around a gauge or a lens, to secure the cover.

    Big Block

Large displacement engines, usually 396,427 and 454 and large cubic inches which allow for a lot of fuel which in turn produces large amounts of horsepower.


A solid bar of metal.


Byproducts of combustion, mostly hydrocarbons, that leak out of the combustion chamber, past the piston and piston rings, into the crankcase during the compression and power strokes. In modern engines, blowby vapors are drawn into the intake through the positive crankcase ventilation (PCV) system and are burned in the engine.


Usually measured in pounds per square inch, it is the pressure the blower makes in the intake manifold. One of the ways to increase airflow through a passage is to increase the pressure differential across the passage. By boosting the intake manifold pressure, air density in the intake manifold will increase, providing more oxygen and more power potential.


The diameter of a cylinder. The displacement can be increased by increasing the diameter (reboring).

    Brake Assist

A technology which senses an emergency braking situation and provides an immediate increase in hydraulic pressure. The system measures the speed at which the brake pedal is pressed in determining whether an emergency braking situation exists. Brake Assist systems can reduce the overall stopping distance of a vehicle by eliminating the human tendency of not braking soon enough or hard enough.

    Brake Dust

As you use your brakes, the brake pads throw off the brake pad material as a fine dust. The brake dust creates a black mess, which sticks to the wheels and lower body panels. Because the front wheels do most of the braking, brake dust is often heaviest on the front wheels. Brake dust is very corrosive to the finish on your wheels and should be removed regularly to prevent damage and discoloration.

    Brake Fade

A condition whereby repeated severe application of the brakes, over a short time period, cause an expansion of the brake drum and/or loss of frictional ability, which results in impaired braking efficiency.

    Brake Horsepower (BHP)

The measure of an engine's horsepower without the loss in power caused by the inefficiencies in the accessories and drive train.

    Brake Lookup

A condition in which, as a vehicle is in motion, one or more wheel's brake is applying enough force to stop the rotation of the wheel. Maximum braking performance is achieved by calibrating each wheels brakes so that when applied, the brakes sit on the verge of locking-up.

    Brake Machining

The practice of turning a drum or a rotor on a special lathe to remove surface imperfections such as scoring, and to eliminate run out and other dimensional problems.

    Brake Torquing

A procedure used to improve the off-the-line acceleration of a car equipped with an automatic transmission, by depressing the brake pedal with the left foot and the accelerator pedal with the right foot. Doing this allows the driver to increase the rpm of the engine before moving forward.


A simple suspension bearing that accommodates limited rotary motion, typically made of two steel tubes, on inside the other, 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. Polyurethane is a common substitute to rubber in the construction of high-performance bushings.

    Bypass Valve

A general term for a valve that lets liquid or air to circumvent an obstruction. For example, a coolant bypass valve allows a small amount of engine coolant to circulate passed the thermostat when it is closed.

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