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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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