What occurs when the automatic brake valve is in the release position?

When the automatic brake valve is in the release position, air is supplied to charge the train brake system. This allows for the replenishment of air in the brake piping and ensures that the brake cylinders can properly respond when the brakes are subsequently applied.

In this position, the brake system is configured to receive air from the main reservoir, ensuring that the brakes are not applied but are instead ready to work effectively when needed. This charging process is crucial for maintaining the integrity and efficiency of the braking system, as it prepares the train for potential braking situations by ensuring that the air pressure within the system is sufficient.

Other options, while related to brake operation, do not accurately describe what happens in the release position. The application of brakes, their permanent release, or the stabilization of system pressure occur under different conditions not associated with the automatic brake valve being in the release position.