What aspect of the push rod should be checked?

The correct aspect to check regarding the push rod is that it must be securely attached to the slack adjuster with a pin and cotter key. Proper attachment ensures that the push rod can effectively transfer the force from the brake actuator to the brakes themselves. This is critical for optimal brake performance and safety.

When the push rod is firmly connected, it prevents any potential disconnection during operation, which could lead to brake failure. A loose or improperly secured push rod could compromise the effectiveness of the braking system, posing significant risks while driving.

Checking for the correct attachment also includes verifying that there are no bends or breaks in the push rod itself, as these factors could negatively impact its functionality. However, the primary focus during a pre-trip inspection should be on ensuring the push rod is securely fastened to the slack adjuster with the necessary hardware.