ND CDL Air Brakes case studies
ND CDL Air Brakes · Put your knowledge to work in context.
The North Dakota commercial driving program is administered by the North Dakota Department of Transportation (NDDOT), whose website lists a Commercial section with pages for the Commercial Driver License (CDL), the Commercial Driver License Manual, how to apply for a CDL, how to renew a CDL, CDL Third Party Testing, and Hazardous Material Requirements. The air brakes knowledge test is the written component a candidate takes to be cleared for vehicles equipped with air brakes; it is separate from the general CDL knowledge test and from the skills test. The ND CDL Air Brakes case studies are 5 cases and about 2,154 words.
1Leak Test Failure at the Fargo Terminal
At a Fargo terminal on a January morning, you are pre-tripping a 2019 tractor with a 2016 53-foot dry van. The dash gauge shows 120 psi with the engine off and the parking brakes released.
456 words, about 2 min2Low-Pressure Warning and Spring-Brake Check at Bismarck
At a Bismarck yard in July, you are checking a 26,000-pound GVWR straight truck with air brakes. The engine is off, the wheels are chocked, and the system is charged to 120 psi.
392 words, about 2 min3Six Percent Grade South of Dickinson
South of Dickinson, you are driving a 78,000-pound tractor-trailer down a 6 percent grade that runs for 5 miles. The posted speed for trucks is 40 mph, and you entered the grade at 58 mph in 9th gear with the engine brake on.
483 words, about 2 min4Rapid Air Loss on I-94 East of Jamestown
On I-94 east of Jamestown, you are driving a 2017 tractor with a loaded 53-foot van at 65 mph. The dash gauge has been steady at 115 psi, but over the last 90 seconds it has fallen to 65 psi and is still dropping.
450 words, about 2 min5Pressure Build-Up and Air Dryer Problem at Minot
At a Minot terminal in February, a 2015 tractor with a 2012 trailer has an air-pressure build problem. With the engine at 1,200 rpm, the dash gauge rises from 85 psi to 100 psi in about 3 minutes, then stops at 100 psi.
373 words, about 2 min