How is a wedge brake activated?

A wedge brake is activated by a push rod from the brake chamber, which is an integral part of its operation. In this system, when the brake chamber receives a signal to engage—usually from air pressure in air brake systems—the push rod extends and pushes against the wedge mechanism. This action causes the wedge to slide and engage the brake shoes against the brake drum, effectively slowing or stopping the vehicle.

This direct mechanical operation facilitates a strong and reliable braking force, which is essential for safety, especially in larger vehicles that require efficient stopping power. The push rod function in the brake chamber sets off the entire process, demonstrating the importance of this component in the braking system.

In contrast, hydraulic pressure, manually pulling a lever, or air pressure as a sole activator do not accurately describe the specific mechanism of how a wedge brake functions, which is centered around the push rod's engagement with the wedge to apply the braking force.