Air Brake Practice Test

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Study for the Air Brake Test. Prepare using flashcards and multiple-choice questions, complete with hints and explanations. Get ready to ace your exam!

Practice this question and more.

What technique is best for controlling speed on steep downgrades?

Using only the service brakes continuously.
Alternate between applying brakes and coasting.
Using engine braking along with controlled service braking.
Braking only when reaching the bottom of the hill.

The correct answer is: Using engine braking along with controlled service braking.

Using engine braking along with controlled service braking is the most effective technique for managing speed on steep downgrades. Engine braking involves downshifting to a lower gear, which enhances vehicle control by utilizing the engine's resistance to slow the vehicle down. This method allows for a more gradual reduction of speed without relying solely on the brakes, which can lead to overheating and reduced brake effectiveness. By combining engine braking with controlled application of the service brakes, the driver can maintain a stable speed while preventing brake fade, which occurs when brakes overheat due to excessive use. This dual approach ensures that the vehicle remains within a safe speed range, even on steep grades, and enhances overall control and safety. Making strategic use of both braking methods helps reduce wear on the braking system and prolongs its effectiveness over the course of the descent.