Final answer:
If the brake valve is placed in electric holding without the electric brake being active, the brakes will not be engaged and the vehicle may roll or move.
Step-by-step explanation:
After a brake application, if the brake valve is placed in electric holding when the electric brake is not cut in, the result will be that the brakes will not be engaged or held in a stationary position.
When the brake valve is placed in electric holding, it means that the electric brakes are not activated. Electric brakes rely on the application of current to generate a magnetic force that engages the brakes. Without this current, the brakes will not engage and the vehicle will not be held in place.
Therefore, if the brake valve is placed in electric holding without the electric brake being active, the brakes will not be engaged and the vehicle may roll or move.