During a brake adjustment, what is the purpose of checking the push rod?

The purpose of checking the push rod during a brake adjustment is to verify it has the correct length. The push rod is a critical component in the air brake system, as it connects the brake chamber to the braking mechanism. When the push rod is adjusted correctly, it ensures that the brakes engage properly and effectively when the air pressure is applied.

If the push rod is too long or too short, it can lead to improper brake operation. A push rod that is too long may prevent the brakes from fully releasing, which can cause excessive wear or overheating, whereas a push rod that is too short may not engage the brakes adequately, leading to reduced braking power and safety issues. Therefore, maintaining the correct length of the push rod is essential for ensuring the functionality and safety of the air brake system in commercial vehicles.