In the 1930s, brothers Ed and William Orscheln established a trucking business. As maintenance supervisor for Orscheln Brothers Truck Line, it was brother Al’s job to fix any problems on the fleet. Parking brakes failed quite often and one day in 1938, driver Gus Williams came in complaining, “You’ve got to fix the parking brake on old Six Speed.” Al sketched out a design (the first “overcenter” parking brake), built one in the shop and installed it on a truck going to St. Louis.

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