When should the push-pull valve pop out due to a system air leak?

The push-pull valve, which is a component in the air brake system, is designed to activate a certain pressure threshold in response to air leaks. This valve is crucial for maintaining the integrity of the braking system by ensuring that it engages if the air pressure drops too low, preventing unsafe conditions.

When considering the operation of the push-pull valve, it is engineered to pop out and perform its function when the system reaches a pressure range where it may no longer be safe to operate. The correct answer indicates that this valve is intended to react at pressures between twenty to thirty pounds per square inch. This range is carefully determined to allow enough air pressure for safe braking operation while also providing a safety mechanism if there's an air leak that compromises the braking system.

The other pressure ranges, while relevant to different operational thresholds, are not the designed activation points for the push-pull valve concerning air leaks specifically. Understanding the proper activation threshold is essential for technicians to diagnose issues effectively and ensure that the air brake system operates safely under various conditions.