New Jersey Air Brakes Practice Exam

"Wig Wag" refers to a mechanical arm that signals low air pressure in air brake systems. When the air pressure in the braking system falls below a certain threshold, the Wig Wag mechanism activates, moving a mechanical arm that visually indicates to the driver that the air pressure is insufficient for safe braking performance. This serves as an important safety feature, alerting the driver to take necessary actions to regain proper air pressure, which is essential for effective brakes. The other options, while related to braking systems, do not accurately describe what a Wig Wag is. A type of brake pad (as mentioned in one of the choices) does not pertain to the signaling aspect, and the term does not reflect a warning light on the dashboard or a valve for controlling air supply. Therefore, understanding the function and purpose of the Wig Wag underscores its importance in ensuring the safety and functionality of air brake systems in vehicles.