The tractor protection valve closes when there is a major leak in which brake line?

The tractor protection valve plays a crucial role in maintaining the integrity of the braking system in combination vehicles. When there is a major leak detected in the emergency brake line, the tractor protection valve automatically closes. This action helps to prevent loss of air pressure that could lead to a failure of the tractor’s braking system.

In scenarios where the emergency brake line has a significant leak, it is essential for the tractor protection valve to respond by sealing off that line to ensure that the remaining braking systems can still function effectively. This is particularly important in maintaining safety, as the emergency braking system is designed to provide an additional level of control in the event of a failure in the primary brake system.

Understanding the function of the tractor protection valve and its relationship to the emergency brake line is vital for safe operation and maintenance of combination vehicles.