True or False: Hydraulic brake systems convert mechanical force into hydraulic pressure only.

The statement is true because hydraulic brake systems function by using the principle of hydraulics to amplify the force applied to the brake pedal. When a driver presses the brake pedal, this mechanical force is transferred to a master cylinder, which contains brake fluid. The master cylinder converts the mechanical force into hydraulic pressure.

This hydraulic pressure is then transmitted through the brake lines to the brake calipers or wheel cylinders at each wheel, where it exerts force on the brake pads or shoes, allowing the vehicle to slow down or stop. This entire process relies solely on the conversion of mechanical force into hydraulic pressure to effectively apply the brakes, ensuring efficient braking performance.

The other options imply circumstances or conditions that would alter this fundamental operation of hydraulic brake systems, but the core principle remains that they indeed convert mechanical force into hydraulic pressure exclusively in functioning as designed.