What happens to brake cylinder pressure after an automatic brake application if the independent brake valve is not actuated?

After an automatic brake application, if the independent brake valve is not actuated, the brake cylinder pressure will increase due to the continued flow of air into the brake cylinder. The automatic application brings the brake cylinder pressure up to the desired level according to the train's braking system design. However, without the operator manually releasing the independent brake valve, the pressure within the brake cylinder does not decrease or stabilize; rather, it continues to rise as additional air is provided, adjusting to the system's operational needs.

The independent brake valve is typically used to control the pressure independently of the automatic brake system, and without any actuation from the independent valve, the brake system will maintain or increase that pressure. This unique feature ensures that if the automatic brake is engaged, it retains its pressure until manually released, enhancing the braking power and allowing for a more controlled response during train operations.