NE CDL Air Brakes case studies
NE CDL Air Brakes · Put your knowledge to work in context.
The Nebraska CDL Air Brakes knowledge test is the written knowledge exam a commercial driver must pass to have the air brake restriction removed from a Nebraska commercial driver's license. It matters to anyone who will operate a vehicle equipped with air brakes - tractor-trailers, straight trucks, buses, and other heavy commercial vehicles - because a CDL issued without passing this test carries an air brake restriction and does not authorize driving air-braked equipment. The NE CDL Air Brakes case studies are 5 cases and about 3,827 words.
1New Compressor, Old Habits: Scoring a Bobtail Function Check
After a shop replaces the compressor and governor on your 2018 tandem-axle tractor, you run a function check in the yard before signing the repair. The unit is bobtailing - no trailer, no converter dolly.
759 words, about 4 min2Six psi in a Minute: Reading a Leak-Down on a Loaded Combination
You are doing a pre-trip on a 2016 three-axle tractor pulling a loaded two-axle 53-foot van. With the engine off, you build to governor cut-out and let the system sit for a full minute to stabilise; the gauge reads 118 psi.
685 words, about 3 min3The Warning That Came Too Late: A Leased Tractor at 05:30
You pick up a leased 2019 day cab, bobtail, at 05:30. During the pre-trip you build to 120 psi, shut the engine off, turn the key to run so the electricals are live, and fan off the brakes.
753 words, about 4 min4Two Miles Into a Six-Mile Grade
You are two miles into a signed six-mile, seven-percent downgrade at 78,000 lb GCW in a 2017 tractor-trailer with a ten-speed manual and a loaded van. You entered the grade at 45 mph in 8th with the engine brake on high.
834 words, about 4 min5Hooked Up in the Dark: The Trailer That Would Not Roll
It is 22:00 and you are hooking to a loaded 53-foot van at a shipper's yard. The tractor's two gladhand lines have faded to almost the same colour, and the trailer's couplers carry no tags.
796 words, about 4 min