Introduce the braking system of the tricycle.

The core of a tricycle's braking system is deceleration through friction. Different types of tricycles are suited to different braking structures. Here is a detailed introduction:

I. Common Types and Characteristics

**Mechanical Drum Brakes:** Brakes use a cable or linkage to push the brake shoes outwards, generating braking force through friction against the inner wall of the brake drum. They are simple in structure, low in cost, and easy to maintain, and are often used in low-speed, light-load recreational tricycles.

**Hydraulic Disc Brakes:** Brakes rely on brake fluid to transmit pressure, pushing the caliper to clamp the brake disc. They offer fast heat dissipation, sensitive response, and strong braking force, making them suitable for high-speed, heavy-load vehicles.

**Vacuum-Boosted Brakes:** Vacuum-assisted braking utilizes the vacuum in the engine's intake manifold to provide additional assistance, significantly reducing pedaling effort. Commonly found in diesel dump tricycles, the assist function is lost when the engine is turned off.

**Linked Brakes:** Brakes distribute braking force between the front and rear wheels through a mechanical or electronic system, achieving simultaneous braking of multiple wheels and shortening braking distance. They are often used in high-end, fully enclosed tricycles. II. Basic Working Principle When the brake pedal is pressed or the brake lever is squeezed, power is transmitted through the cable/hydraulic oil to the actuator at the wheel end, causing the brake pads to rub against the rotating brake drum/brake disc, converting the kinetic energy of the vehicle into heat energy for dissipation, thereby achieving deceleration or stopping.