What component often works in conjunction with high pressure gas pumps in the suspension system?

The correct answer is the hydraulic fluid reservoir, as it plays a crucial role in the suspension system of the Joint Light Tactical Vehicle (JLTV). In a suspension system, high-pressure gas pumps are often used to provide a specific level of support and damping characteristics. The hydraulic fluid reservoir supplies the necessary hydraulic fluid that is essential for transferring force within the system. This fluid assists the high-pressure gas pumps in adjusting the suspension's response to various terrains, enabling a smoother ride and better vehicle handling.

The other options do not have a direct functional relationship within the suspension system. Air filters are connected to the vehicle's air intake and engine performance, brake pads are part of the braking system and not linked to suspension, and transmission gears are involved in power transfer from the engine to the wheels. Hence, while these components are important in their respective systems, they do not work in conjunction with the high-pressure gas pumps in the suspension system like the hydraulic fluid reservoir does.