NJ CDL Air Brakes Test case studies
NJ CDL Air Brakes Test · Put your knowledge to work in context.
The New Jersey CDL Air Brakes Test is the knowledge exam a driver must pass to have the air brake restriction removed from a New Jersey commercial driver license, or to avoid having it applied in the first place. It is intended for drivers who will operate vehicles equipped with air brakes - tractors and semitrailers, dump trucks, buses, and heavy straight trucks - where stopping depends on compressed air rather than hydraulic pressure. The NJ CDL Air Brakes Test case studies are 5 cases and about 2,696 words.
1Primary Gauge Falls on Route 17
Your 2018 Kenworth T680 tractor is loaded to 78,000 lb GCW. After a normal stop at a light on Route 17, you notice the primary (rear) air gauge falling from 120 psi to 90 psi in about 25 seconds while the secondary (front) gauge holds at 120 psi.
592 words, about 3 min2Left Rear Push Rod Overstroke on a Straight Truck
During a pre-trip inspection on a 2020 International LT straight truck (GVWR 33,000 lb, air brakes, type 30 rear chambers), you build system pressure to 90 psi, mark both rear push rods with chalk, and have a helper apply the service brake. The left rear push rod moves 2 1/4 inches; the right rear moves 1 1/2 inches.
539 words, about 3 min3Single-Vehicle Leak Test: Static Pass, Applied Fail
You are doing a pre-trip on a 2017 Freightliner M2 26,000-lb box truck with air brakes. You build pressure to 120 psi, shut off the engine, chock the wheels, and release the parking brake.
495 words, about 2 min4Brake Fade on a 6% Grade
You are driving a 2019 Volvo VNL tractor pulling a 53-foot dry van, gross weight 78,000 lb, down a 6% grade that runs for 4 miles. The outside temperature is 95°F.
554 words, about 3 min5Slow Build-Up and Low Governor Cut-Out
On a 2015 Freightliner Cascadia day cab (bobtail, no trailer), you start the engine with the air system at 85 psi. The pressure builds to 100 psi in 80 seconds.
516 words, about 3 min