1, brake oil shortage, resulting in brake friction increases, the brake is not sensitive.
2, return valve seal bad, out of the valve valve tension broken, resulting in elasticity of the rotation support, resulting in inflexible.
3, brake cylinder pressure bowl aging, swell, piston stuck, resulting in brake effect is not flexible.
4, brake shoes, brake clearance is too large, resulting in operation is not sensitive.
5, the brake drum caused by the brake effect is not sensitive.
6, the brake hydraulic system into the air, resulting in hydraulic system is not enough strength.
7, brake wear caused by the brake effect is not sensitive.