MO CDL Air Brakes case studies
MO CDL Air Brakes · Put your knowledge to work in context.
The Missouri CDL Air Brakes knowledge test is the endorsement-specific written test a Missouri commercial driver license applicant takes when the vehicle they will drive is equipped with air brakes. In Missouri the test is administered as part of the CDL knowledge testing process, and the study material is the air brakes chapter of the Missouri Commercial Driver License Manual published by the Missouri Department of Revenue. The MO CDL Air Brakes case studies are 5 cases and about 2,928 words.
1Compressor Build-Up Fails at the Columbia Yard
You are assigned a 2019 Freightliner Cascadia day cab with a dual-circuit air system, hooked to a loaded 53-foot dry van. Before leaving the Columbia yard, you run the compressor build-up check.
607 words, about 3 min2Leak Test Fails on a Straight Truck Headed for Kansas City
You are doing a pre-trip on a 26,000-lb GVWR straight truck with a single air system and a 26-foot box. You charge the system to governor cut-out at 122 psi, shut off the engine, chock the wheels, and release the parking brake.
574 words, about 3 min3Brake Fade on a Six Percent Grade With a Loaded Van
You are driving a 5-axle tractor-semitrailer at 78,000 lb gross eastbound on a 6% downgrade 2.8 miles long. At the top a sign reads trucks 35 mph, and a runaway ramp is marked near the bottom.
604 words, about 3 min4Sudden Air Loss at Highway Speed Near Mile Marker 148
At 65 mph on I-70 near mile marker 148, loaded to 80,000 lb, you hear a loud pop, then the low-air warning buzzer. The primary gauge has fallen from 122 psi to 72 psi in about eight seconds and is still dropping; the secondary holds near 110 psi.
568 words, about 3 min5Cold Morning, a Wet Tank, and a Governor That Will Not Stop
It is 20 F in Springfield and you are pre-tripping a 2020 International LT with a dual-circuit air system and an air dryer. When you drain the wet tank, about a cup of water comes out.
575 words, about 3 min