How does hydraulic fluid flow through the service brake system?

In a hydraulic brake system, the flow of hydraulic fluid through the components is essential for effective braking. When the modulating pedal valve is pressed, it directs hydraulic fluid towards the disc brakes. This action allows the force exerted on the brake pedal to be translated into hydraulic pressure, which subsequently engages the disc brakes.

This mechanism is vital because the disc brakes are designed to clamp down on the rotating discs attached to the wheels, thereby slowing or stopping the vehicle as necessary. The direct flow from the modulating valve to the brakes ensures that the operator can control the braking force proportionally based on the pedal input, allowing for smooth and responsive braking performance.

In contrast, the other answer choices represent different components and pathways within the hydraulic system that do not directly convey how the hydraulic fluid reaches the disc brakes for stopping power.