What do the operations on a PA4 indicate when the electric brake is cut out?

When the electric brake is cut out on a PA4, the operation of the brakes transitions to a mode characterized by a slow application and release. This can be attributed to the mechanical principles governing brake functions when the electric component, which often allows for a rapid engagement and disengagement of the brakes, is no longer in action.

In this state, the braking system relies more on the mechanical or pneumatic systems, leading to a slower response time compared to when the electric systems are operational. This slower application ensures smoother control over the train's deceleration and is particularly important in maintaining safety during the braking process.

The choice referring to quick engagement and disengagement would not apply here, as the absence of electrical control removes that capacity. Normal application, while it might seem plausible, overlooks the specific effects of cutting out the electric brake, and the choice stating no effect on the brakes is inaccurate since the entire dynamic of brake responsiveness changes when the electric system is removed.