Drum brakes use an internal expanding brake shoe with the lining attached, working within the confines of a rotating brake surface called a brake drum.
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A hydraulically operated caliper is used to force the lining friction material against the braking surface of the rotor for stopping wheel rotation.
This brake system must be capable of holding the vehicle on a grade and bringing the vehicle to a stop if service brakes fail.
The universal joint or U-joint is used to connect the drive shaft to the transmission output shaft.
Truck steering systems are either manual or power assisted, with power assist units using either hydraulic or air assist setups to make steering effort easier.