Worldâs first parking meter installed. Share this: The worldâs first parking meter, known as Park-O-Meter No. 1, is installed on the southeast corner of what was then First Street and Robinson Avenue in Oklahoma City, Oklahoma on this day in 1935. The parking meter was the brainchild of a man named Carl C. Magee, who moved to Oklahoma City from New Mexico in 1927.
Check rate of air pressure buildup: When the engine is at operating RPM, the pressure should build from 85 to 100 psi within 45 seconds in dual air systems. (If the vehicle has larger than minimum air tanks, the buildup time can be longer and still be safe.
Check the Air Brake System. The Seven-Step Air Brake check -DO THIS AT PRETRIP INSPECTION when performing the Skills Test portion of the CDL exam. Designed to test the governor cut-in and cut-out pressures, air pressure leakage, warning buzzer, brake valves and air pressure rebuild rates. Brakes off means the yellow and/or red valve is pushed in (on = valve out). 1. Engine on / Brakes on  check gauges to make sure governor cuts compressor off at 120 psi.