What is the maximum allowable movement of the push rod when the brakes are released?

The maximum allowable movement of the push rod when the brakes are released is a critical aspect of brake system functionality and safety. Allowing no more than 1 inch of movement ensures that the brake system can effectively engage and disengage as needed, maintaining the vehicle's safety and performance.

Exceeding this movement could indicate possible issues with the brake system, such as wear in the brake components or incorrect adjustments. This limit is set to ensure optimal braking performance, as excessive push rod movement can lead to decreased responsiveness and could potentially keep the brakes in a partially engaged state, which poses a risk during operation.

Other options suggest greater movements that exceed the safety standard, which could compromise braking effectiveness and safety on the road. It’s important to adhere to this measurement to ensure the comprehensive maintenance and reliability of the braking system.