What does ATC use to transfer engine power to another wheel?

Air pressure is the mechanism that the Air Transfer Control (ATC) uses to transfer engine power to another wheel in vehicles equipped with air brake systems. This process relies on the principles of pneumatic systems, where compressing air provides the necessary force to actuate various components of the braking system.

In the context of air brake systems, air pressure is essential for ensuring that the brakes function effectively, distributing power across different wheels as needed during operation. The use of air pressure allows for rapid and reliable adjustments to braking force, which is critical for maintaining stability and control of the vehicle, especially under varying load conditions.

Other options, while they play roles in different systems, do not pertain to the operation of the ATC in transferring engine power effectively. Hydraulic pressure, for instance, is typically associated with hydraulic brake systems rather than air brake systems. Electrical signals are significant in various modern vehicle systems but do not directly influence the transfer of engine power to wheels in traditional air brake setups. Mechanical linkages can be present in various vehicle components but lack the necessary versatility and responsiveness compared to air pressure in this specific context.