Depending on the wear condition

Depending on the wear condition, disc brake is generally 50,000 km, drum brake is generally 100,000 km. Disc brake is sometimes called disc brake, it is divided into ordinary disc brake and ventilation disc brake two kinds. Ventilation disc brakes are made by drilling a number of circular ventilation holes in the DISC surface, or by cutting a vent slot or prefabricated rectangular ventilation holes in the end face of the disc, its cold and hot effect than the ordinary disc brake better. The main advantages of disc brakes are quick braking at high speeds, better heat dissipation than drum brakes, good constancy of braking performance, and easy installation of advanced electronic equipment such as ABS, there is a flat brake shoe on both sides of the brake disc. When the oil pressure from the brake master pump is sent to the dividing cylinder, the brake shoe is clamped to the brake disc to achieve the braking effect, the utility model has the advantages of sensitive action, good heat dissipation, no need to adjust the brake clearance and easy maintenance. Drum brakes have been used in cars for nearly a century, but their reliability and powerful braking force have enabled them to be used on many models today (mostly rear wheels) . It is fixed to the tire and rotates at the same speed. When braking, the oil pressure is used to push the brake shoes to touch the inner edge of the brake drum, and the friction generated by the contact is used to restrain the rotation of the tire so as to achieve the purpose of braking. The drum brake is composed of a brake floor plate, a brake sub-pump, a brake shoe and other relevant connecting Rod, a spring, a pin and a brake drum. Currently installed in the rear wheel. The drum brake has lower cost and higher absolute brake force. The inner surface of the drum brake is where the brake moment is generated. With the same brake Torque, the brake drum diameter of the drum brake can be much smaller than that of the disc brake. Therefore, in order to obtain strong braking force, the heavy d Brake shoe is the brake cam or the role of the push rod is pushed outward by the brake brake drum brake function of the accessories, its shape like a half moon. Most cars adopt the front disc and rear drum brake structure. In general, the front brake shoes wear out relatively fast, and the rear brake shoes use relatively long time, in the daily inspection and maintenance should focus on the following aspects: 1. Check the brake shoes every 5,000 km under normal driving conditions, not only to check the remaining thickness, but also check the condition of the shoes wear, whether the degree of wear on both sides is the same, whether the return position is comfortable, etc. , any abnormality found must be dealt with immediately. 2. Brake shoes are generally composed of iron lining plate and friction material two parts, must not wait for friction material parts are worn out before replacing the shoes. 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 instrument will alarm to replace the shoes. If the shoes reach the limit of use, they must be replaced. Even if they can be used for a period of time, the braking effect will be reduced and the driving safety will be affected. 3. Replacement to replace the original spare parts provided by the brake pad, only in this way, in order to make the brake pad and brake disc between the best braking effect, the least wear. 4. When replacing the shoes, a special tool must be used to push back the brake sub-pump. Do not press back hard with other crowbars, this can easily lead to brake caliper guide screw bending, so that the brake pad stuck. 5. After replacing the shoes, you must brake several feet to eliminate the shoes and brake disc gap, resulting in the first foot did not brake, prone to accidents. 6. Brake shoes replacement, to run-in 200 km in order to ach