KY CDL Air Brakes study plan

List every major air brake system component from memory (compressor, governor, reservoir, drain valves, safety valve, foot valve, brake chambers, slack adjusters, push rods, foundation brakes, low-pressure warning device) and state the function of each in one sentence.

Explain the compressor-to-governor cut-in/cut-out cycle aloud, naming typical cut-out and cut-in pressures and what happens to unloader action at cut-out.

Distinguish service, parking, and emergency brake circuits and identify which components belong to each.

Trace the path of air from compressor through the supply reservoir to a brake chamber on a hand-drawn diagram and label every device along the route.

Describe how a dual (split) air brake system divides into two circuits and explain why the vehicle can still stop after one circuit fails.

Explain the role of check valves, the double check valve, and reservoir isolation in protecting the intact circuit.

State the function of the low air pressure warning device and the spring brakes as a backup, including the approximate pressure at which the warning must activate.

Compare a dual-circuit system to a single-circuit system and list at least three safety advantages of the dual design.

Recite the in-cab and walk-around air brake inspection steps in the correct order without notes.

Identify what to check on each component during the walk-around: drain valves, slack adjusters, push rods, brake chambers, hoses, lines, and drums/discs.

Explain how to check slack adjuster and push rod travel by hand and state what a normal push rod stroke looks like versus an out-of-adjustment brake.

Describe how to drain air tanks properly and why moisture and oil contamination matter.

List the required air brake system tests in order: air compressor build-up, governor cut-out, static leak test, applied leak test, low pressure warning, and spring brake (emergency) test.

State the pass/fail criteria for each test, including acceptable leak rates and the pressure range where the warning must sound.

Demonstrate the static and applied leak tests and correctly interpret a gauge drop that exceeds the limit.

Explain how to test the spring brakes and the parking brake and what a failure indicates.

Recite all air brake tests from memory in under five minutes with correct pass/fail numbers.

Explain proper braking technique for normal stops: how to apply and release the foot valve smoothly and why you should not fan the brakes.

Describe how to check brakes after driving through water and what to do if they feel weak.

Explain the effect of vehicle load, speed, and road surface on stopping distance and how to adjust following distance.

Explain the correct downgrade procedure: select a safe gear before the descent, use engine braking, apply brakes firmly to reduce speed then release, and avoid riding the brakes.

Describe what brake fade and overheating are and why continuous light braking on a long grade causes them.

List the steps for an emergency stop when brakes fail, including using the parking/spring brakes, downshifting, and looking for an escape route.

Explain when and how to use the emergency spring brakes if air pressure is lost, and describe what happens to stopping distance.

Re-review components, dual-system safety features, and inspection steps and close any remaining gaps from earlier quizzes.

Explain how a component failure in one circuit affects the other circuit and what the driver would notice.

Answer 30 mixed practice questions on components, dual systems, and inspection, then review every wrong answer.

Re-perform the mock inspection and test sequence to confirm retention after the break.

Take two full-length timed practice exams covering all six domains and score each.

Recite the air brake tests, downgrade procedure, and emergency steps one final time without notes.

Review every missed question from the entire eight weeks and rewrite the correct answer with a reason.

Confirm readiness by identifying any domain still below 80% and drilling it.