What should be determined after performing the necessary reductions during the brake test?

After performing the necessary reductions during the brake test, it is essential to determine that all brakes release. This step is critical because it verifies the functionality of the braking system; ensuring that once the brake application is released, the train is not held by the brakes inadvertently. If the brakes do not release properly, it could lead to hazardous situations during operation, such as unwanted movement or difficulty in starting.

While it is also important to ensure that all locomotives' brakes can apply, check for leakage, and confirm the usability of independent brakes, the primary focus immediately after a brake test is to ensure that the system responds correctly by releasing. This establishes a baseline for safe movement and handling of the train, contributing to overall operational safety.