LA CDL Air Brakes case studies
LA CDL Air Brakes · Put your knowledge to work in context.
The Louisiana CDL Air Brakes Knowledge Test is the written knowledge component a Louisiana commercial driver must pass to add the air brakes restriction removal - that is, to be licensed to operate a commercial vehicle equipped with air brakes. Louisiana issues three basic classes of Commercial Drivers Licenses - Class A, Class B and Class C - and air brake knowledge is tested separately from the general CDL knowledge exam, so candidates should expect a dedicated test built around system components, inspection, operation, failure warning signs, and leak/low-pressure testing. The LA CDL Air Brakes case studies are 5 cases and about 2,451 words.
1Rapid Compressor Cycling After Air Dryer Service
Your 2019 International MV single-unit truck (33,000 lb GVWR, 140,000 miles) has a 26-foot flatbed loaded to 21,000 lb. After an air dryer cartridge was replaced at a shop, the compressor at fast idle builds 85 to 100 psi in 2 minutes 40 seconds.
525 words, about 3 min2Excessive Slack Adjuster Free Play on an Automatic System
During a pre-trip at a shipper's yard, you inspect a 2018 Kenworth T680 tractor with a 53-foot van trailer. The tractor has automatic slack adjusters.
511 words, about 3 min3Brake Fade on a Long 6% Downgrade
You are driving a 5-axle tractor-semitrailer at 78,000 lb on a 6% downgrade that is 5 miles long. The posted speed for trucks is 35 mph.
484 words, about 2 min4Low Air Pressure Warning While Approaching a Bridge
You are driving a 2017 Peterbilt 579 with a 53-foot trailer, gross weight 74,000 lb, at 55 mph on a two-lane highway. The low-pressure warning buzzer and light activate.
440 words, about 2 min5In-Cab Air Brake Tests After Preventive Maintenance
After a PM service on a 2015 Freightliner Cascadia day cab, a single-unit truck with no trailer, you perform the in-cab air brake tests. At fast idle, pressure builds from 85 to 100 psi in 3 minutes 50 seconds.
491 words, about 2 min