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brake disc wear structure:

Disc brake discs (discs) are divided into solid discs (single disc) and duct discs (double disc). Solid disc is easier for us to understand. To put it bluntly, it is solid. As the name implies, the air duct plate has the effect of ventilation. From the outside, it has many holes on the circumference leading to the center of the circle, called air duct.

When the car is driving, the air convection at the air duct achieves the purpose of heat dissipation, which is much better than the solid heat dissipation effect. Most cars are front-wheel drive, and the front disc is worn out with a frequency meter, so the front air duct disc and the rear solid disc (single disc) are used. Of course, there are also air duct discs before and after, but the manufacturing cost is not too bad.

Brakes currently include disc brakes, drum brakes and air brakes. Many older cars have front discs and rear drums. Many cars today have disc brakes at the front and rear. Because disc brakes have better heat dissipation than drum brakes, they are not prone to thermal degradation under high-speed braking, so their high-speed braking effect is good. But at low-speed cold brakes, the braking effect is not as good as drum brakes. The price is more expensive than the drum brake. Therefore, many mid-to-high-end cars now use full-disc brakes, while ordinary cars use front and rear drums, while relatively low-speed trucks and buses that require a large braking force still use drum brakes.

Under normal use, we should check the front brake disc every 60000 kilometers and the rear brake disc every 120000 kilometers. The maintenance cycle specified by different car manufacturers is not exactly the same, and the specific replacement cycle is subject to the requirements of the car manufacturer.

Judging whether the brake disc needs to be replaced can be done in the following three ways:

1 Listen to the sound.

If the brakes are lightly tapped with the sound of "iron rubbing against the iron" or a scream (it may also be caused by the running-in of the brake pads at the beginning of installation), the brake pads must be replaced immediately. Because the limit marks on both sides of the brake pad have directly rubbed the brake disc, it proves that the brake pad has exceeded the limit.

In this case, when replacing the brake pads, it is necessary to cooperate with the inspection of the brake discs. When this sound occurs, the brake discs are often damaged and scratched. At this time, even if the new brake pads are replaced, the noise cannot be eliminated. Replace the brake disc.

In addition, some poor quality brake pads have hard points, which will also produce abnormal noise. In general, the abnormal noise generated in this way will disappear after a period of time.

2. Look at the brake disc warning light

Usually, whether the brake disc warning light on the dashboard is on or not is used as the basis for judging whether the brake disc should be replaced. Generally, the indicator light is off. When the brake disc fails or is excessively worn, the light is on and goes out after repair. When the warning light is on, the brake disc has been worn to the limit, and the braking effect has been reduced, which greatly affects driving safety.

3. Look at the thickness of the brake disc

Most brake disc products have wear indicators, that is, 3 small pits are distributed on the disc surface. Measure the depth of the pit with a vernier caliper to be 1.5mm. In other words, the total wear depth of both sides of the brake disc reaches 3mm, and it is recommended to replace the brake disc in time.

The low thickness of the brake pads will be replaced because:

1. Since the brake pads are consumables, they will gradually wear out during use. When they are worn to the limit, they must be replaced, otherwise the braking effect will be reduced and even a safety accident will be caused;

2. Under normal driving conditions, test the brake pads for every 5000 kilometers of driving, not only to detect the remaining thickness, but also to detect the wear of the brake pads;

3, and whether the degree of wear on both sides is similar, whether the return is comfortable, etc., found that abnormal conditions must be dealt with immediately.