As the brake skin wears, the gray paste on the brake pad becomes a lubricant, causing the force to pinch the brakes. So you must open the brakes, brake pads if the surface is too smooth, too much wear with sandpaper, put the ash clean up, just look at the brake rocker angle, the rocker arm back a little, so installed after the screw is screwed the brake room.
The best angle should be that the brake skin comes into contact with the outside drum, and the rocker arm is at right angles to the cable. At this moment, the torque is the maximum, so as to achieve the best braking effect.
