CDL Vehicle Combination Practice Test

When inspecting air brakes before driving, it is essential to check for air leaks and ensure proper air pressure. Air brakes operate using compressed air, and maintaining the right pressure is crucial for their effective functioning. Insufficient air pressure can lead to brake failure, making the vehicle unsafe to operate.

Additionally, checking for air leaks is vital because any loss of pressure due to leaks can impair the braking system's performance. This includes inspecting hoses, connections, and other components for signs of wear or damage that could cause leaks. Ensuring both proper pressure and the absence of leaks contributes to reliable braking performance and safety on the road.

The other considerations, like only looking at the brake pads, focusing on clutch function, or checking the flow of a refrigerator, do not directly relate to the critical aspects of air brake inspection, which centers on air pressure and leaks.