If the truck has air brakes it was simple matter to include a parking brake as part of the air brake system.
GM used a drive shaft mounted parking brakes with hydraulic brake systems until the quit making medium duty trucks.
Ford built a lot of their medium duty trucks with Lucas Girling brakes on the rear. That system used a spring applied, hydraulically released parking brake on the rear drums. The parking brake system is a lot like wedge style air brakes but used hydraulics rather than air to release them.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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