What should be paid attention to in the inspection and maintenance of brake shoes

The brake shoe refers to the accessory that is pushed outward by the action of the brake cam or push rod to suppress the brake drum to exert the braking effect, and its shape is like a half moon.

Most cars adopt the structure of front disc and rear drum brakes. Generally, the front brake shoes wear out relatively quickly, and the rear brake shoes are used for a relatively long time. During daily inspection and maintenance, the following points should be paid attention to aspect:

1. Under normal driving conditions, check the brake shoe every 5,000 kilometers, not only to check the remaining thickness, but also to check the wear state of the shoe, whether the degree of wear on both sides is the same, whether it can return freely, etc., if it is found to be abnormal The situation must be dealt with immediately.

2. Brake shoes are generally composed of iron liner and friction material. Do not wait for the friction material to wear out before replacing the shoe. For example, for the front brake pads of the Jetta, the thickness of the new pads is 14 mm, while the limit thickness for replacement is 7 mm, including the thickness of the iron liner of more than 3 mm and the thickness of the friction material of nearly 4 mm. Some vehicles have a brake shoe alarm function. Once the wear limit is reached, the instrument will alarm and prompt to replace the brake shoe. The shoes that have reached the limit of use must be replaced, even if they can still be used for a period of time, the effect of braking will be reduced and the safety of driving will be affected.

3. When replacing, the brake pads provided by the original spare parts should be replaced. Only in this way can the braking effect between the brake pads and the brake disc be the best and the wear and tear should be minimized.

4. Special tools must be used to push back the brake cylinder when replacing the shoes. Do not use other crowbars to press back hard, which will easily lead to the bending of the guide screw of the brake caliper and cause the brake pad to be stuck.

5. After replacing the shoe, be sure to step on the brake several times to eliminate the gap between the shoe and the brake disc, resulting in no brake on the first foot, which is prone to accidents.

6. After the brake shoe is replaced, it needs to run in for 200 kilometers to achieve the best braking effect. The newly replaced shoe must be driven carefully.