Formula One glossary

Back pressure

The resistance to the flow of exhaust gases through the exhaust system. By rerouting the exhaust gases for noise suppression, a muffler causes back pressure, but a straight pipe alone causes only minimal back pressure. Some engines require back pressure, so that removing the exhaust system will cause internal damage.

Backmarker

A car that gets a blue flag to let someone pass by because he is a lap up.

Balaclava

The fireproof hood drivers wear under their helmets to avoid burns to the face and neck.

Ball joint

Usually refers to the outboard (wheel) end of a CV joint (halfshaft). The ball joint allows the wheel to steer and move with the suspension and still receive power from the engine. The term ball joint can also be used to refer to how suspension components are attached.

Ballast

Weights fixed around the car to maximise its balance and alter it to the minimum weight limit.

Bar

A unit of pressure. One bar equals 100 kilopascals or 14.5 psi.

Bargeboard

This is the part of the car body mounted vertically located between the front wheels. It is an aerodynamic panel to help ensure there is a smooth airflow around the side of the car and into the sidepods.

Bearings

Small, hard metal balls designed to reduce friction between moving parts.

Bias

Describes the relative engagement of front versus rear brakes as selected by the brake balance control in the cockpit.

Blistering

High levels of stress on tyres can cause blistering. This phenomenon is the result of localised heat build-up, particularly in the shoulder of the tyre, as it flexes. If not dealt with by reducing the demands on the tyre, this can cause parts of the tread pattern to break away and affect performance. Blistering can occur due to using unsuitable tyres for the track, a wrong car set-up or the tyre pressure being too high.

Bodywork

All entirely sprung parts of the car in contact with the external air stream, except cameras, camera housings and the parts definitely associated with the mechanical functioning of the engine, transmission and running gear. Airboxes, radiators and engine exhausts are considered to be part of the bodywork.

Bottoming

This is caused by the chassis of the car hitting the track as it runs through a sharp compression and finds the bottom of its suspension travel.

Brake Balance

There is a switch in the cockpit drivers can use to switch the brake power from the front to the rear, or vice versa.

Brake Duct

A type of an air happer that is especially made to direct air onto the brakes to cool them down. These can very from race to race, following the needs of brake cooling, as one circuit may demand more brake performance than another.

Brake master cylinder

The part of the hydraulic brake system which stores the brake fluid. As the brake pedal is applied pressure is forced against a small movable piston in the master cylinder to push hydraulic fluid through the lines to the wheel cylinders and force the brake linings against the drum (in the case of drum brakes) or force the brake pads against the disc (in the case of disc brakes).

British racing green

A dark green color which used to be the official racing color for British cars