When the driver presses the brake pedal, the working process of the foot brake valve can be described as follows:
Force transmission: The brake pedal is the direct interface between the driver and the brake system. When the driver presses the brake pedal, they trigger the braking action by applying a certain amount of force. This force is not applied directly to the brake, but is transmitted to the foot brake valve through a lever or connecting rod. This design allows the driver to generate sufficient braking force with less force, while also ensuring flexibility and precision in operation.
Piston or mechanism movement: There are one or more pistons or related mechanisms inside the foot brake valve, which are designed to respond to the force of the brake pedal. When the driver presses the brake pedal, the force transmitted through the lever or connecting rod pushes the piston or mechanism to move. This movement changes the state inside the valve, opening or closing the channel for the flow of brake fluid or air.
Control fluid: In modern vehicles, the foot brake valve is connected to the brake fluid system. When the piston moves, it compresses the brake fluid and pushes it to the vehicle's brakes (such as brake drums or brake discs). Brake fluid is an incompressible fluid that transfers the driver's pedal force evenly to the brakes of each wheel. When the piston relaxes, the brake fluid flows back into the master cylinder, the brake releases pressure, and the wheel's braking force is reduced or released.
Flow control: Changes in pedal force directly affect the degree of movement of the piston or mechanism, which in turn determines the flow of brake fluid and the magnitude of braking force. The driver can precisely control the magnitude of braking force by adjusting the strength and speed of pedaling. Lightly pressing the brake pedal will produce less braking force, while pressing harder will produce more braking force. This flexibility allows the driver to respond appropriately under different driving conditions and in different emergency situations.
Coordination with other systems: The operation of the foot brake valve is usually coordinated with other safety systems of the vehicle to ensure the braking effect and safety. . The ABS system prevents the wheels from locking during emergency braking by monitoring the speed of the wheels and adjusting the brake pressure. When the ABS system detects that the wheel is about to lock, it sends a signal to the foot brake valve, asking it to reduce the flow and pressure of the brake fluid. This prevents the wheels from locking and allows the driver to better control the direction and stability of the vehicle in an emergency.
In summary, when the driver steps on the brake pedal, the foot brake valve converts the driver's braking intention into actual braking force through force transmission, piston or mechanism movement, fluid control, flow control and other steps, thereby achieving vehicle deceleration or parking. At the same time, the work of the foot brake valve cooperates with other safety systems of the vehicle to ensure the safety and effectiveness of the braking process.
