The newly replaced brake pads have abnormal noise, it is also very important to check these two points!-Gelobo Brake System | Brake pad | Brake shoes

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The newly replaced brake pads have abnormal noise, it is also very important to check these two points!

Release Time:

2021-09-15

Recently, I heard that many friends have such problems. Many car owners have abnormal brake noise a few days after the maintenance and replacement of the brake pads. Some car owners may not notice the abnormal noise due to the relatively slight abnormal noise, while some abnormal noises are more obvious, which makes the car owner think that there is a new problem with the newly replaced brake, which leads to the trouble of the second return to the factory for inspection.

The newly replaced brake pads have abnormal noise, it is also very important to check these two points!

Recently, I heard that many friends have such problems. Many car owners have abnormal brake noise a few days after the maintenance and replacement of the brake pads. Some car owners may not notice the abnormal noise due to the slight abnormal noise, while some abnormal noises are more obvious, which makes the car owner think that there is a new problem with the newly replaced brake, which leads to the trouble of the second return to the factory for inspection.

When it comes to brake noise, it is not only encountered in cars. For road bicycles and motorcycles, the problem of abnormal sound of brake pads is often encountered and occurred on these two models. So why are the newly replaced brake pads prone to abnormal noise? This has to do with the design of the brakes themselves.
Disc Brake

At present, the mainstream of passenger cars in the market adopts disc brakes, which are composed of brake discs and brake calipers. The brake disc is shaped like a turntable, also made of metal, and rotates coaxially with the wheel. The brake caliper is fixed, and it forms a "caliper" across both sides of the brake disc. During the braking process, the drive mechanism urges the brake caliper to clamp both sides of the brake disc, and the brake pads embedded in the caliper rub the brake disc violently, forcing its speed to decrease until it stops.
Poor brake pad contact

The wear between the brake disc and the brake pad is definitely not uniform, because the material used for the brake pad is not a pure metal block, but a metal-carbon ceramic mixture, which is fired into one under high temperature and high pressure environment, and the surface is smooth, so the The brake disc is not flat, and there are grooves.

When the new brake pads are replaced, because the new brake pads are flat and smooth, there will be poor contact when they come into contact with the brake discs that already have fine grooves. The convex part on the brake disc is in contact with the brake pad, so that the contact area between the two will become smaller, and the braking effect will become worse and abnormal noise will occur.
Grinding the brake pads

For the problem of the abnormal noise of the new brake pads, the gentleman can talk to the technician when replacing the brake pads. It is required to polish the brake pads before loading, and round the chamfer on the brake pads. Make the brake pads and the outermost side of the brake disc surface not in contact, so that the abnormal noise can be solved.
Grinding the brake disc

For this method, the editor generally does not recommend the master to do it. Specifically, grinding the brake disc is commonly known as "disc". It is to remove the brake disc and fix it on the milling machine, and use the milling cutter to scrape off all the grooves on the disc surface. Generally, the optical disc drive is 50-100 wires (1 wire = 0.01mm), and the thickness life of the general brake disc can only support such a "planing" operation at most once.

For brake pad grinding, the mechanic grinding off the oxide layer and chamfer on the new brake will affect the service life of the brake pad to a certain extent. Generally, the service life of brand-new brake pads is about 40,000-50,000 kilometers, and the early break-in of the brakes by the technician will reduce the life of the new brake pads. For example, the original brake pads can run for 40,000 kilometers, but now they can only run 37,000 kilometers. kilometers away.

As for the brake disc, scraping off a layer of the disc surface will cause an error in the local weight of the original brake disc. The sensitivity of the brake disc to dynamic balance is no less than that of the tire. The low tolerance of the thickness tolerance cannot exceed 0.3 ounces, and the lateral runout cannot exceed 0.15 ounces. This tolerance cannot be recognized by the naked eye at all. But it is because of such a low tolerance that it can ensure an effective noise reduction and jitter-free performance when the disc and film are operating at high speed. So it is recommended that you replace the brake disc.