The drum brake pushes the brake pad of the device in the brake drum by hydraulic pressure to cause the brake pad to rub against the inner surface of the brake drum that rotates with the wheel, thereby generating a brake effect. The inner surface of the brake drum of the drum brake is the position at which the brake device generates the braking torque. In the case of the same braking torque, the diameter of the brake drum of the drum brake can be much smaller than the brake disc of the disc brake.
advantage
• 1. There is automatic braking, so that the brake system can use lower oil pressure and use a brake drum with a smaller diameter than the brake disc.
• 2, the brake mechanism is easy to install. In some models with rear wheel brakes, the brake mechanism of the drum brakes is installed in the center of the brake disc.
• 3, the processing and composition of the parts is relatively simple, and has a relatively low manufacturing cost.
Disadvantage
• 1. The brake drum of the drum brake will increase in diameter after being heated, and the stroke of the brake pedal will be increased, which may cause the brake reaction to be less than expected. Therefore, when driving a vehicle with a drum brake, it is necessary to avoid the occurrence of thermal degradation of the brake pad due to high temperature caused by continuous braking.
• 2, the brake system reacts slowly, the brake pedaling force is less controllable, which is not conducive to high frequency braking action.
• 3, the construction of complex parts, the brake clearance must be adjusted, making maintenance difficult.
