Do You really Know Brake Pads?

The brake device usually has two forms: drum brake and disc brake. Except that few small cars still use drum brakes, most models on the market are using disc brakes. Therefore, this article only describes the disc brake.

 

The principle of disc brake (commonly known as "disc brake") is to use a brake caliper to control two brake pads, clamp the brake disc on the wheel, and brake the brake pads by friction, so the brake pads become thinner and thinner.

 

 

The thickness of a brand-new brake pad is generally about 1.5cm, and there is a raised mark at both ends of the brake pad, which is about 3mm. If the thickness of the brake pad is equal to this mark, it should be replaced immediately. If it is not replaced in time, the brake disc will be seriously worn.

 

The braking system is directly related to the owner's life, so it can't be underestimated. Therefore, once the brake system makes abnormal noise, we must pay attention to it. In addition to normal wear and tear, small sand particles may also be the culprit of the brake pad's abnormal noise. During the driving of the vehicle, there will be very small sand particles entering the middle of the plate and plate, because of the abnormal noise caused by friction.

 

Of course, don't worry about this situation. Just run and let the small sand fall out. There is also a special case - if the new brake pads are not run in well, they will also make abnormal noises. The brake pads that have just been replaced will be relatively hard and will be better after about 200 kilometers. Some car owners will accelerate and slam on the brakes to achieve the effect of running on the brakes in a short time. However, this will reduce the service life of the brake pads. It is suggested that in this case, it is recommended to run for another period to observe, and not artificially force the brake pads to wear.

 

In fact, in addition to the brake pads, there are many reasons for the abnormal sound of the brake system, such as installation operation, brake discs, brake calipers, and chassis suspension. The car mainly develops the good habit of maintenance and inspection to prevent harm before it happens.

 

Maintenance cycle of brake system

 

1. Replacement cycle of brake pads: generally, vehicles equipped with brake sensing lines have an alarm function for 6w-8w km or about 3-4 years. Once the wear limit is reached, the instrument will alarm and prompt replacement.

 

2. The service life of the brake disc is more than 3 years or 100000 kilometers. There is a formula to help memory: change the brake pads 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 oil is subject to the maintenance manual. Generally, it needs to be replaced within 2 years or 40000 kilometers. After the brake oil has been used for a long time, the leather cup and piston in the brake pump will be worn, causing the brake oil to be muddy and the brake performance will be reduced. In addition, the brake oil is relatively cheap, so do not save money and causes big losses.

 

4. Regular inspection of hand brake take the common pull rod hand brake as an example. In addition to the braking function, it is also necessary to check the sensitivity of the hand brake. Teach you a little tip. When driving slowly on a flat road, pull the hand brake slowly and feel the sensitivity and joint of the handle. However, the number of such inspections should not be too many. In short, the whole system is related to life safety. The brake system should be checked within 2 years or 40000 kilometers, especially for cars that often drive on high-speed or long-distance roads, which need regular maintenance and inspection.

 

In addition to professional inspection, some self-test methods can be used for reference by riders.

 

Look

 

The thickness of the brake pads of most disc brakes can be observed with the naked eye. When it is found that the thickness is only 1/3 of the original, the thickness change should be observed frequently. When it is parallel to the mark, it should be replaced immediately.

 

Listen

 

Listening to the sound can also judge whether the brake pads have been worn thin. If you hear a sharp "bared" sound just after stepping on the pedal, it indicates that the thickness of the brake pads has been worn below the marks on both sides, causing the marks on both sides to directly rub the brake discs. However, if the abnormal sound occurs only after the brake pedal is stepped on the second half, it is likely to be caused by the workmanship or installation problems of the brake pads or brake discs, which need to be checked in the store.

 

Step on

 

When you feel tired when you step on the brake, it also means that the brake pad has lost friction. At this time, you must replace it, otherwise, it will be life-threatening.

 

Measurement

 

Of course, it can also be judged by the braking distance. Generally, the braking distance of 100 km / h is about 40 meters. The more this distance is exceeded, the worse the braking effect is. We've talked about it before, so I won't go into details.

 

Finally, it is also important to develop good driving habits. For example, don't brake hard often. When encountering a red light, you can loosen the throttle and slide, reduce the speed by yourself, and gently step on the brake when stopping quickly. This can effectively reduce the wear of brake pads.

 

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