New Jersey Air Brakes Practice Test 2025 - Free Air Brakes Practice Questions and Study Guide

When driving downhill with a vehicle equipped with air brakes, selecting low gears and applying brakes intermittently is important for maintaining control and safety. Using a low gear allows the engine to help slow the vehicle by utilizing engine braking. This reduces reliance on the air brakes, which can overheat if used continuously over a long descent.

Applying the brakes intermittently helps manage speed while preventing overheating and maintaining the effectiveness of the braking system. This method allows the driver to maintain better control of the vehicle, reducing the risk of brake failure or uncontrollable acceleration downhill.

In contrast, using high gears while avoiding the brakes can lead to excessive speeds, increasing the risk of losing control. Increasing speed to maintain momentum can also be dangerous, especially on steep declines where rapid deceleration may be necessary. Turning off the air brakes to save energy is not a safe practice, as it would eliminate the primary braking system necessary for controlling the vehicle's speed.