How often should brake shoes be changed

How often should brake shoes be changed?

Let's start with how brake shoes work.

Braking devices usually have two forms: "drum brake" and "disc brake". Except for a few small cars that still use drum brakes (such as POLO, Fit's rear brake system), most models on the market use disc brakes. Therefore, this article only describes disc brakes.

The principle of disc brakes (commonly known as "disc brakes") is to control two brake shoes with brake calipers, clamp the brake disc on the wheel, and brake by friction, so the brake shoes become thinner and thinner.

The thickness of a piece of brand-new brake shoes is generally about 1.5cm. There is a protruding mark on both ends of the brake shoes, which is about 3mm. If the thickness of the brake shoes is the same as this mark, it should be replaced immediately. If it is not replaced in time, it will seriously wear the brake disc.

Judging from the mileage of a friend's car, brake shoes are said to have no problems. Usually, it is recommended to replace brake shoes when the mileage is 60,000-80,000 kilometers. However, this mileage is not absolute and is related to driving habits and environment. I think that my friend is a person who likes violent driving, and he is almost stuck in the urban area all year round, so premature wear of brake shoes is very likely. It can be judged from the abnormal metal noise of brake shoes that his brake shoes have been worn down to the position below the limit mark and need to be replaced immediately.

The braking system is directly related to the life of the car owner, so it should not be underestimated. Therefore, once the brake system makes an abnormal noise, it must be paid attention.

Other reasons that are easily overlooked

In addition to normal wear and tear, small sand particles may also be the culprit behind the abnormal noise of brake shoes. During the driving of the vehicle, there will be very fine sand particles entering the middle of the disc and the disc, because of the abnormal noise due to friction. Of course, don't worry about this situation, just run and let the small sand fall out.

There is also a special situation - if the new brake shoes are not run in well, there will also be abnormal noises. The brake shoes that have just been replaced will be harder, and will be better after about 200 kilometers. Some car owners will accelerate and slam on the brakes to achieve the effect of running in the brakes in a short time. However, this will reduce the service life of brake shoes. It is recommended to run for a while and observe in this situation, and do not artificially force wear brake shoes.

In fact, in addition to brake shoes, there are many reasons for the abnormal noise of the brake system, such as installation operation, brake disc, brake caliper, and chassis suspension may cause abnormal noise. Habits to prevent harm before it happens.

Maintenance interval of the brake system

1. Replacement cycle of brake shoes: generally 6w-8w kilometers or about 3-4 years

Vehicles equipped with brake induction lines have an alarm function. Once the wear limit is reached, the instrument will alarm to prompt replacement.

2. The life of the brake disc is 3 years or more than 100,000 kilometers

There is a formula to help memory: change brake shoes twice and change a pair of brake discs. According to personal driving habits, it can also be replaced by three discs or one disc.

3. The replacement cycle of brake fluid is subject to the maintenance manual

Under normal circumstances, it needs to be replaced every 2 years or 40,000 kilometers. After the brake fluid has been used for a long time, the leather cup and piston in the brake pump will be worn, causing the brake fluid to be cloudy and the braking performance will be reduced. In addition, brake oil is relatively cheap, so avoid saving small money and causing big losses. (Reference article: "How often to change the brake oil")

4. Check the handbrake regularly

Taking the common lever handbrake as an example, in addition to the braking function, it is also necessary to check the sensitivity of the handbrake. Teach you a little tip. When driving slowly on flat roads, slowly pull the handbrake and feel the sensitivity and engagement point of the handle. However, the number of such checks should not be too many.

In short, the entire system is related to life safety. The brake system should be checked every 2 years or 40,000 kilometers, especially for cars that often travel at high speeds or long distances, and require regular maintenance and inspections. In addition to professional inspections, there are some self-testing methods for riders to refer to.

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