LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - CONTINUED
KINGPIN, TWIST LOCK, AND COUPLING PINS
Kingpin - Extends down from fifth wheel plate and is used to couple the semitrailer to the towing vehicle.
Twist Locks - Locks the MILVAN container to the semitrailer chassis at its four corners.
Coupling Rods - Coupling rods are used to couple two semitrailers together.
Brake System - Operates on air supplied by the towing vehicles.
Air Reservoir - Stores pressurized air for brake operation at the bogie.
Relay Valve - Controls flow of air to air reservoir and from air reservoir to brake chamber. It mounts on the air reservoir.
Brake Chambers - Mounted on the axle beam and operates the brake mechanism that applies the brakes.