Drum brake advantages, self-braking effect: Drum Brake has a good self-braking effect, because the brake to make the film, the more the wheel spins with the external brake drum twisting at an angle (not so large that you can see it easily) , the more tension (braking force) is ap...

Brake shoe is the action of Brake Cam or push rod and is pushed outward to press brake drum brake function of accessories,

The front brake shoes of the Jetta, for example, are 14 mm thick, while the replacement limit is 7 mm, which includes over 3 mm of iron liner and nearly 4 mm of friction material. Some vehicles are equipped with brake shoes alarm function, once reached the wear limit, the instrum...