In drum brakes, what is the role of the brake shoes?

The role of the brake shoes in drum brakes is to press against the inner surface of the drum to create friction. When the brake pedal is depressed, the hydraulic system activates the brake shoes, which then expand outward. This expansion presses the friction material on the brake shoes against the inner surface of the brake drum. The resulting friction slows down or stops the rotation of the drum, which is connected to the wheel, ultimately bringing the vehicle to a halt.

This function is crucial because the effectiveness of the brake shoes in creating friction directly impacts the braking performance. Properly functioning brake shoes contribute to a safe and efficient braking system by providing the necessary grip on the drum.