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 - Box Plow Blues - by Tom Schwarz. One of the first implements most tractor owners obtain is the box plow. For very little money, this piece of equipment promises to plow and flatten any hill or vale on your ranch road or farm. At least that's what I thought! As simple as a box plow appears, it can be rather challenging to make work correctly. In our sandy soils of Florida, traction is king. You can never have wide enough tires or heavy enough weights to get all the traction you want � unless you own a monster tractor. U
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