Final answer:
The normal position of the operating brake valve when a vehicle is running over the road should be set to ensure efficient brake operation without causing drag or wear.
Step-by-step explanation:
The question pertains to the proper operational condition of the brake system in a vehicle, specifically when it is "running over the road." According to standard practices for vehicle operation, the normal position of the operating brake valve during transit should be in a state that allows for the regular operation of the brake system without causing unnecessary drag or wear. This is important for maintaining both safety and efficiency.
In terms of mechanical principles, the mention of smoking brakes in a truck, as evidenced by FIGURE 14.5, is used to illustrate the conversion of kinetic energy into thermal energy. This can occur when brakes are overused or not operating correctly, leading to visible smoke and potential damage. Therefore, it is critical that the operating brake valve is correctly adjusted to prevent such conditions.
Without specific information on the type of brake system or vehicle, it is challenging to provide a more detailed procedure for the correct brake valve position. However, drivers are advised to refer to their vehicle's operating manual or seek professional assistance for precise instructions on brake valve handling and maintenance.