FL CDL Air Brakes case studies
FL CDL Air Brakes · Put your knowledge to work in context.
The Florida CDL Air Brakes knowledge test is the endorsement exam a commercial driver must pass before operating a vehicle equipped with air brakes. In Florida, the air brakes restriction is tied to the class of vehicle you drive, so anyone testing for a Class A or Class B commercial license in an air-brake-equipped truck, bus, or tractor-trailer will need this endorsement on the record. The FL CDL Air Brakes case studies are 5 cases and about 2,974 words.
1Primary Circuit Leak Found During the Applied-Leakage Test
Pre-trip inspection, 06:10, company yard in Ocala. The unit is a 2019 tandem-axle tractor pulling a 53-foot van, loaded to 77,400 lb.
605 words, about 3 min2Borderline Numbers on a Single-Unit Pre-Trip
A 33,000-lb GVWR dump truck with a single rear axle and air brakes on all wheels is due out at 08:00. The driver drains the tanks, idles to governor cut-out at 122 psi, shuts down, and runs his tests, writing the numbers on his hand: brakes released, one minute: 121 to 119 psi full foot-valve application, one minute: 121 to 117 psi fast idle from 85 psi: reaches 100 psi in 62 seconds warning buzzer: sounds at 57 psi spring brakes: fully applied at 34 psi He also notes the steering-axle chambers are standard-stroke clamp type and the pushrods extend about 1 7/8 inches with the brakes applied.
583 words, about 3 min3Pressure Falling on a 6 Percent Grade
A 79,000-lb five-axle combination starts down a 6 percent grade posted "Trucks 35 mph," five miles long, in eastern Tennessee. The load is 40,000 lb of steel coil secured behind a bulkhead.
587 words, about 3 min4419 Feet of Truck, 350 Feet of Room
A 60-foot combination runs at 55 mph on wet US-27 north of Sebring, following a line of cars toward a construction flagger. The ABS warning lamp has been on since the driver started the shift; the shop says the part is on order.
595 words, about 3 min5Five Findings at the Weigh Station
A Florida inspector pulls a 2015 three-axle tractor and two-axle van into a weigh station on I-4. He records: (1) the left steer-axle chamber is a standard-stroke clamp type and the pushrod measures 2 1/4 inches; (2) the right front trailer drum is cracked to the edge and a piece of the lip is missing; (3) the tractor's trailer-supply hose is chafed through its cover and leaks at the coupler; (4) pressure builds from 85 to 100 psi in 40 seconds at fast idle; (5) the remaining trailer linings are even at 3/8 inch.
604 words, about 3 min