California CDL Air Brakes Test case studies
California CDL Air Brakes Test · Put your knowledge to work in context.
The California CDL Air Brakes Test is a knowledge exam that commercial drivers must pass to operate vehicles equipped with air brakes. It applies to drivers pursuing a Class A or Class B commercial license, and to drivers who already hold a CDL but need the air brake endorsement or want the air brake restriction removed from their license. The test is administered at California DMV offices, usually on a computer, and consists of multiple-choice questions drawn from the air brake section of the California commercial driver handbook. Topics include system components such as compressors, governors, reservoirs, and slack adjusters; the dual-circuit air supply; pre-trip inspection procedures, including the static leak and applied leak tests; normal braking technique, including proper use of the foot brake and gearing; handling failures such as low air pressure warnings and spring brake engagement; and parking brakes, retarders, and anti-lock brake systems. The California CDL Air Brakes Test case studies are 5 cases and about 2,981 words.
1Gauge Needle Falls to Zero on a Long Downgrade
You drive a 3-axle tractor with two trailers, loaded to 78,000 lb, descending a 6 percent grade at 45 mph. The grade is 4 miles long and the next runaway ramp is posted 1.5 miles ahead.
671 words, about 3 min2Pre-Trip Leak Test Shows a Slow Drop
Before a morning run, you build air pressure to 120 psi, shut off the engine, and let the system settle. With the brakes released, the gauge drops from 120 to 112 psi over one minute.
580 words, about 3 min3Spring Brakes Won't Release After a Cold Night
You are assigned a 2019 tractor with a dual-circuit air system and spring brakes on the rear axle. Overnight the temperature fell to 18 degrees F.
578 words, about 3 min4Retarder and Brakes on a Wet Mountain Pass
You are driving a 5-axle tractor-trailer at 72,000 lb down a 7 percent grade in light rain. The road is wet and the surface is slick in shaded curves.
593 words, about 3 min5ABS Light Comes On Mid-Run With a Load
You are driving a 3-axle tractor with a loaded trailer at 65 mph on a dry interstate. The yellow ABS lamp on the dash, which was off at startup, illuminates and stays on.
559 words, about 3 min