Primary controls are components that are used to put your vehicle in motion and stop your vehicle from moving.

Primary Controls for Moving the Vehicle:
- Steering wheel
- Clutch pedal
- Brake pedal
- Accelerator pedal
- Shifter, range selector, and side-splitter

Primary Controls for Stopping the Vehicle:
- Parking brake valve
- Trailer hand valve
- Trailer air supply valve
- Jake brake, auxiliary brake system
- Antilock braking system (ABS)

Control devices in vehicle systems, such as brake systems and steering systems, play a crucial role in regulating movement and ensuring functionality.

Explanation:

Control devices are components that allow certain movements while preventing others. In a vehicle's brake system, the valve system functions to restrict movement in one direction but permits it in the opposite direction. Upgrading to an electrohydraulic steering system in tractors allows for autonomous operations through electronic control signals.

Learn more about Vehicle Control Systems here:

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