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 - Diagnosing Engine Difficulty - Diesel Tractors - by Staff. The following suggestions are listed for your assistance. You can make simple adjustments on your tractor that will improve its operation and save you the time and expense of hiring someone to do it for you. Always make one adjustment at a time, and if the adjustment made does not improve the condition, return to the original setting before proceeding to the next adjustment. Hard Starting Cold air temperatures. Insufficient fuel.
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