Boot: Protective cover with pleats and usually made of rubber, used to contain lubricant and provide protection from dirt, water, grime, etc.

Body-in-white: Body shell after welding every thing, but before it is painted. Named so because original protective undercoat was white or light yellow.

Bleeding of brakes: The process of driving out the air out of the hydraulic braking system.

Bead: The portion of a tyre that holds it on the rim.

Ball joint: A ball and matching socket connecting suspension components (e.g., steering knuckle to lower control arms). It allows rotary movement in any direction between…

Backlash: The clearance or play between two mating parts, such as meshed gears.

Axle designation: A numerical expression which describes the total number of wheels followed by the number of driving wheels. For instance, 4" x 4" vehicle…

Axle casing: Axle casing also called 'Axle housing' in USA, it means a tubular housing enclosing the half shafts, their bearings and the differential.

Autonomous car: A vehicle which can sense its environments and navigate without any human input. Also called 'driverless' or 'self-driving' car.

Aspect ratio: It is the ratio height/width of the tyre section and is expressed in percentage.

Articulated vehicle: A heavy goods vehicle consisting of a tractor and a semi-trailer. The two units are connected together by means of a fifth-wheel coupling.

Aquaplaning: The tendency of a tyre to float over water on the road rather than penetrating the water and remaining in contact with the road.

Approach angle: When viewed from the side, this is the angle between the ground and a line running from the front tyre to the lowest…

Anti-squat: The suspension geometry which resists the vehicle body's tendency to nose-up pitching while accelerating.

Anti-roll bar: A bar employed to resist body-roll, which connects the left wheel suspension assembly with the right wheel side. It may be there at…