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A Kaiser valve or “king” vale is a pneumatic valve on the tractor that proportions or allocates braking air pressure to different axles of the tractor trailer when the brake pedal is depressed. Because most tractor trailers have 5 axles, each with brakes, the air used to initiate the brakes must be allocated in a […]

A kingpin is the metal pin on the bottom of the trailer that connects to the 5th wheel on the tractor or power unit. A king pin is actually a large steel plate about 5’ by 5’ feet that is welded to the bottom of the leading end of a trailer. Attached to the center of