The service life of car brake pads, the service life of brake pads

The service life of automobile brake pads: the main properties of brake pads.

The performance of the same brake pad at different temperatures, at different speeds, and at different braking pressures is very different.

1. Braking performance: refers to the braking ability (friction coefficient) of brake pads under normal braking conditions (braking temperature is relatively low).

2. Decay performance: In road conditions such as downhill mountain roads, the brakes brake continuously braking, the temperature rises rapidly, and the brake disc may reach.

Temperatures of four, five hundred or even above 700 degrees Celsius. The braking ability of the brake pads will deteriorate, and the braking distance will increase. This phenomenon is called a "recession", and of course we want the recession rate to be as small as possible.

The decay rate of high-quality brake pads is very small, and some even do not decay, while some counterfeit and shoddy products have a serious decay rate, and almost lose their braking ability at high temperatures.

3. Recovery performance: After high temperature decay, when the temperature drops, can the brake pad recover the original braking performance as soon as possible? This is also the importance of measuring the quality of brake pads.

4. Brake pad wear: It is the wear and tear of the brake pad when it is used. The braking effect depends on the formula and process of the friction material, such as carbon fiber brake pads can be used for hundreds of thousands of kilometers without replacement, in addition to the wear of the brake itself, but also consider the wear of the brake pads.

During braking, high-quality brake pads will generate a protective film on the friction surface of the brake disc to reduce the wear of the brake disc, while low-quality brake pads contain a large number of hard spots and impurities, which will pull out many grooves on the surface of the brake disc and accelerate the wear of the brake pads and brake discs.

5. Noise is also a very important indicator in today's advocating environmental protection, in fact, there are many factors that cause brake noise, and brake pads are only one of them. It is generally believed that if the hardness of the brake pads is too high, it is easy to produce noise.

6. There are other performance indicators such as shear strength, hardness, compressibility, thermal expansion, water absorption, adhesion and so on.

Generally, the frequency of replacing brake pads in cars is about 30,000 kilometers, if the brakes are not too ruthless, the brake pads can run more than 10,000 kilometers, basically 30,000 kilometers when you have to check.

If the brake pads are gone, it is very dangerous, now most cars basically have brake pad warning lights, if the brake pads are thin, the instrument lights will alarm, and the low-end models do not have alarm lights, then the brake pads can see the thickness of friction in the gap of the wheel hub.

If the car is not worn out to 7-80,000 kilometers, the brake pads are too hard, and the brake discs are not good, so it is recommended to replace the brake pads.

There is no fixed life span, some run 10,000 kilometers, some run 10,000 kilometers, and everyone's driving habits are different.

<> "Structural Principle of Brake Pads:

Brake pads are generally composed of steel plates, bonded insulation, and friction blocks, where the insulation layer is composed of materials that do not transfer heat for the purpose of heat insulation. The friction block is composed of friction materials and adhesives, and is squeezed on the brake disc or brake drum to produce friction when braking, so as to achieve the purpose of decelerating and braking the vehicle. As a result of friction, the friction blocks are gradually worn out, and generally speaking, the lower the cost of the brake pads, the faster they will wear out.

After the friction material is used, the brake pads should be replaced in time, otherwise the steel plate will be in direct contact with the brake disc, and eventually the brake effect will be lost and the brake disc will be damaged. The brake drum is equipped with brake shoes, but the brake pads are generally referred to as brake pads and brake shoes, so they are used"Disc brake pads"In particular, it is the brake pads installed on the disc brakes. It's not a brake disc.

Generally speaking, the brake pads wear out faster than those on the highway. Because the car that often drives in the city often has to stop and go, and the brakes will be used a lot. Take the road, it is possible to walk dozens of kilometers before you need to slow down or stop, and there are relatively few opportunities to use the brakes.

In a mixed driving situation (half highway, half urban), the brake pads on the front wheels should last 670,000 km. The brake pads on the rear wheels should last more than 100,000 km. Of course, this is not absolute, but I have been experiencing it as a rough average.

The front brake pads wear out quickly, because when braking, the center of gravity of the car will lean forward, and the force to be borne by the front brake is greater than that of the rear brake, with a ratio of about 7:3So, if you look at the heel of the front brake, it is generally larger than the rear brake.

When the brake pads are almost expired (less than 20 thicknesses remaining), the brakes will be heard"Chirp"The sound of the brigade suspicion. This is because of the brake pads"Alert hooks"Caused by scraping the brake disc. When you hear such a sound, you should check the following brakes as soon as possible.

The wear and tear of the brake pads is related to the road conditions according to the model and the driver's daily driving habits, some car brake pads can be used for hundreds of thousands of kilometers, and some are worn out for one or two thousand kilometers, it is recommended to let the maintenance worker check the thickness of the brake pads by the way every time you maintain the car, and it is best to replace it in advance when the remaining one-third, after all, it is the main spare parts for car safety.

Brake pads do not have a fixed service life. Under normal circumstances, the front brake pads are replaced within 3-50,000 kilometers, and the rear brake pads are replaced within 5-70,000 kilometers.

The service life of brake pads is related to road conditions, driving habits and skills, and the area where the vehicle is driving.

The wear of brake pads in urban areas is greater than that of highways; Skilled driving skills, skilled old drivers often step on the brakes, new drivers brake pads wear more, plains than mountainous brake pads wear more.

When driving normally for 20,000 kilometers, check the thickness of the brake pads, if the wear exceeds 2 3, the brake pads need to be replaced.

As a wearing part of brake safety, brake pads should be checked and maintained regularly. If the brake pads are thin and the surface of the friction block is abnormal, the brake pads should be replaced in time to avoid affecting the safety of life and property.

1. Reduce sudden braking, drive gently, and don't step on the accelerator or brake.

2. When going down a long and steep slope, don't step on the brakes all the time, you can first use the method of gear reduction to slow down the vehicle, and then alternately use the brakes to reduce the wear and tear of the brake pads.

3. When driving, you should pay attention to keeping a proper distance from the car in front and not too close, so as to avoid sudden braking.

4. In terms of car maintenance, you should regularly check whether there are foreign objects in the brake pads and whether the brake pads are abnormally damaged.

Slightly high-end cars, the dashboard will have a warning when the brake pads are ground to the limit, and the low-end cars without brake induction lines, when the brake pads are ground to a certain extent, the brake disc will have a sizzling sound when the brake is stepped on, which is actually a metal bulge grinding to the brake disc, reminding the owner that the brake pads also need to be replaced!

There is no exact time limit for the life of the brake pads, as the wear and tear of the brake pads is the most important factor in determining whether the brake pads should be replaced. Everyone's driving habits and driving conditions are different, which leads to inconsistent wear and tear of brake pads. If you insist on a deadline, 50,000 kilometers and 60,000 kilometers should almost be replaced, depending on the thickness, the new brake pads are generally around it, if you observe it with the naked eye to become thinner, then it needs to be replaced!