How do wedge brakes operate?

Wedge brakes function by utilizing a wedge mechanism to create friction and bring the vehicle to a stop. In this system, the brake chamber push rod plays a vital role; it effectively inserts a wedge between the brake shoes as the driver engages the brakes. When the wedge is inserted, it causes the brake shoes to spread apart and press against the brake drum, generating the necessary friction to slow down the vehicle. This design is particularly efficient for heavy vehicles and trailers, where reliable and effective braking is essential.

Other methods of braking, such as hydraulic systems, use fluid to transmit force for braking; however, in wedge brakes, it is the physical action of the wedge that generates the braking force. While leverage mechanisms can also be part of various brake systems, they do not describe the specific operation of wedge brakes. Therefore, the distinctive action of the wedge mechanism in separating the brake shoes to create friction accurately identifies how wedge brakes function.