Minnesota CDL Air Brakes Test case studies
Minnesota CDL Air Brakes Test · Put your knowledge to work in context.
The Minnesota CDL Air Brakes Test is the knowledge exam a driver must pass to remove the air brake restriction from a Minnesota commercial driver's license and to operate vehicles equipped with air brakes. It matters for Class A and Class B applicants, for drivers upgrading an existing CDL, and for anyone whose license shows the restriction because they tested in a vehicle without air brakes. The Minnesota CDL Air Brakes Test case studies are 5 cases and about 3,725 words.
1Pre-Trip Air Test: Four Readings, Two Failures
You are doing the in-cab portion of the pre-trip on a three-axle tractor with a dual-circuit air system (wet, primary and secondary reservoirs) that sat outside overnight at 18°F. Pressure is at zero when you start the engine.
767 words, about 4 min2One Gauge Falling on a Downgrade
You are 40 miles into a run with a loaded three-axle tractor pulling a tandem-axle van, gross weight 76,000 lb. On level ground both gauges read 118 psi.
757 words, about 4 min3Four-Second Gap at 55 mph
You drive a five-axle combination at a gross weight of 76,000 lb on dry, level asphalt at 55 mph. Behind a flatbed hauling steel plate you time a four-second gap between its rear and your front bumper.
705 words, about 4 min4Fade on Ruinous Creek Grade
Six miles of continuous 6% downgrade lie ahead on a two-lane mountain highway and the posted truck speed is 45 mph. You are at 78,000 lb gross in a 10-speed manual and you enter the grade at 50 mph in 9th.
745 words, about 4 min5Overnight in the Pullout After a Descent
You pull into a gravel pullout on a 4% downhill grade at 9 p.m. after a five-mile descent with a 76,000 lb load.
751 words, about 4 min