A braking system where the brakes are applied by air pressure.

A braking system where the brakes are applied hydraulically but application is made by air pressure.

A filter that removes most liquid and water vapour from the air before it reaches the reservoirs.

A dash-mounted gauge telling the driver how much air pressure is in the primary and secondary reservoirs

A dash-mounted gauge which tells the driver the amount of air pressure being delivered when brakes are applied.

Air taken from the primary and secondary circuits.

Loss of braking efficiency due to overheating the brakes.

The time required for air to flow through the system when brakes are applied.

Steel plates with lining which squeeze against the rotor (disc).

A term sometimes used to describe the brake chambers