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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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