Overview of Brake Shoe Information
I. Definition and Function
The brake shoe is a core component of the drum brake system. It is arc-shaped and installed inside the brake drum. When the driver depresses the brake pedal, the brake shoe expands outward via hydraulic or mechanical force, creating friction against the inner wall of the brake drum. This friction generates braking force, decelerating or stopping the vehicle.
II. Structure and Composition
Main Components:
Shoe Body: Typically made of cast iron or aluminum alloy, providing structural support and strength.
Friction Lining: Bonded or riveted to the surface of the shoe body, using materials such as asbestos, semi-metallic compounds, or ceramics to generate braking friction.
Support Pin/Shaft: Fixes the brake shoe, allowing it to pivot and conform to the brake drum.
Classification:
Leading-Trailing Shoe: One shoe acts as the "leading shoe" (self-energizing, friction enhances braking force), while the other acts as the "trailing shoe" (de-energizing, friction reduces braking force).
Dual Leading Shoe: Both shoes function as leading shoes, providing stronger braking force and commonly used in front-wheel brakes.
Servo-Type Shoe: Utilizes leverage to amplify braking force, featuring a complex structure but high efficiency.
