Colorado CDL Air Brakes case studies
Colorado CDL Air Brakes · Put your knowledge to work in context.
The Colorado CDL Air Brakes knowledge test is the written endorsement exam a commercial driver must pass before operating a vehicle equipped with air brakes, and it is required knowledge for anyone pursuing a Colorado commercial driver license with an air brakes restriction removed. This independent study page is built for candidates who want focused, self-contained practice on the four skill areas that the air brakes endorsement tests: air brake system components and how they operate, pre-trip inspection and leak checks, brake adjustment together with warning devices and malfunctions, and emergency braking, parking brakes, and safe driving practices. The Colorado CDL Air Brakes case studies are 5 cases and about 2,678 words.
1Repeated Air Dryer Purge on a Loaded Tractor-Trailer
You are driving a 2021 Kenworth T680 tractor pulling a 53-foot dry van, gross combination weight 76,000 lb, eastbound on I-76 near Fort Morgan. At a truck stop, you build air pressure from 80 psi.
566 words, about 3 min2Combination Leak Test Fails at Denver Yard
At your Denver terminal at 5,280 ft on a 35°F morning, you perform a pre-trip leak check on a 3-axle tractor and 2-axle trailer. You build pressure to 120 psi, shut off the engine, and wait for the gauge to stabilize.
548 words, about 3 min3Pushrod Travel Over Limit on a Drive Axle
At a Colorado Port of Entry on US-287, an inspector asks you to apply the brakes while he measures pushrod travel. Your 2016 Volvo VNL tractor has a 48-foot flatbed trailer.
522 words, about 3 min4Spring Brakes Won't Hold on a Silverthorne Grade
You are driving a 2018 Freightliner M2 box truck with a GVWR of 25,500 lb and air brakes. You park on a 7% grade on a side street in Silverthorne, Colorado, facing downhill.
507 words, about 3 min5Low Air Pressure Warning on a Downhill Run
You are driving a 2019 Peterbilt 567 dump truck with a GVWR of 66,000 lb, loaded with gravel, southbound on I-25 approaching the Colorado Springs downgrade. The grade is 5% for 3 miles.
535 words, about 3 min