Arizona Air Brakes CDL Practice Test

Before starting a trip with an air brake-equipped vehicle, it's essential to check for air leaks, proper pressure, and overall system functionality. This step is crucial because the air brake system relies on compressed air for operation, and any leaks can lead to a loss of braking power, posing significant safety risks. Ensuring that the air system is functioning correctly means verifying that there is sufficient air pressure in the system, which is necessary for the brakes to engage effectively.

Checking for air leaks involves inspecting the hoses, fittings, and other components of the air brake system for any signs of wear or damage that might result in air escape. Confirming proper pressure includes ensuring that the gauge readings are within the acceptable range before setting out. Finally, checking the overall functionality of the system includes testing the brakes themselves to make sure they are responsive.

Although monitoring emissions levels and tire pressure are important, they do not directly pertain to the air brake system's integrity and functionality, which are critical for safe operation. Likewise, brake sensitivity adjustment is a more specialized task that pertains to the configuration of the braking system rather than a pre-trip check.