KY CDL Air Brakes study guide
KY CDL Air Brakes · Work through your exam, one topic at a time.
The Kentucky CDL Air Brakes knowledge test is the written endorsement exam a commercial driver must pass before operating a vehicle equipped with air brakes. It applies to drivers seeking or upgrading a Class A or Class B CDL, and to Class C drivers who will operate air-brake-equipped vehicles such as certain buses. The KY CDL Air Brakes study guide has 6 sections and about 2,104 words.
01Air Brake System Components and Functions
Components and Functions tests whether you can identify each part of a heavy-vehicle air brake system, state its job, and predict the result of its failure, using the federal CDL air brake material Kentucky follows. An engine-driven compressor supplies air.
378 words, about 2 min02Dual Air Brake System and Safety Features
This domain tests the two-circuit design, the warnings and protection valves that make it safe, and the spring (emergency/parking) brake system. A dual air system has two independent circuits fed from the supply tank: the primary usually operates the rear brakes and the secondary the front brakes.
366 words, about 2 min03Inspecting the Air Brake System
Expect questions on the pre-trip air brake inspection sequence: what to look at, the order of the checks, and the pass/fail numbers. Park on level ground and chock the wheels.
333 words, about 2 min04Air Brake System Tests
This domain is the numbers test: cut-in, cut-out, leak limits, warning threshold, spring brake range, build-up time, and safety valve setting. Memorize each value and the condition it is measured under.
323 words, about 2 min05Using Air Brakes While Driving
How to stop, slow, and control a vehicle with air brakes in normal driving, and why air brakes behave differently from hydraulic brakes. Use controlled braking: press the pedal and hold it, adjusting pressure as needed.
358 words, about 2 min06Braking on Downgrades and Emergency Procedures
Grade strategy, brake fade, and what to do when brakes fail or a stop goes wrong. Check brakes and air pressure at the top.
346 words, about 2 min