How often is it appropriate to change the rear brake disc?
Under normal circumstances, the rear brake disc is replaced every 100,000 km. However, it is important to note that this cycle is not absolute, and it is also affected by many factors, such as driving habits, road conditions, vehicle type, and so on. Therefore, the owner needs to judge according to the actual situation.
Brake pad thickness is an important indicator to determine whether the brake disc needs to be replaced. In general, the thickness of the new brake pads (excluding the thickness of the steel pad of the brake pads) is about 15-20mm. When the thickness of the brake pad is observed with the naked eye, it is only 1/3 of the original, and the brake disc needs to be replaced. Of course, if the brake pad wear is excessive, it will not only cause the brake effect to deteriorate, but also increase the wear of the brake disc, so it should be replaced in time.
In addition, the degree of wear of the brake disc is also a factor that needs to be considered. If the brake disc surface appears obvious wear or scratches, the brake disc also needs to be replaced. If you are not sure whether the brake disc needs to be replaced, you can use professional tools to detect, such as measuring the thickness of the brake disc, checking the wear degree of the brake disc surface, and so on.
In short, the replacement cycle of the brake disc needs to be judged according to the actual situation, if uncertain, it is recommended to consult professional car maintenance personnel in time to ensure driving safety. At the same time, in daily driving, the owner should also pay attention to the maintenance of the brake system, avoid excessive use of the brake, in order to extend the service life of the brake disc and brake pads.
Does the rear brake disc shake when deformed
Will cause jitter
The rear brake disc deforms, causing jitter. The rear brake disc deformation will cause the phenomenon of shaking when braking, which is because the brake disc wear uneven or into the foreign body resulting in uneven surface.
The causes of jitter caused by brake disc deformation mainly include:
Brake disc partial wear: the use of spot braking for a long time will cause the surface of the brake disc to be uneven, causing jitter when braking. Engine foot mat aging: the foot mat is responsible for absorbing the subtle shake of the engine, and the shake will be transmitted to the steering wheel and cab after aging.
Hub deformation: Hub deformation can also lead to brake shaking, replacing the brake pad or brake disc can only temporarily solve the problem. Tire dynamic balance problem: Failure to do dynamic balance after tire replacement may also lead to brake jitter.
Solutions include:
Replace the brake disc: If the brake disc is seriously worn or uneven, a new brake disc should be replaced in time. Check and replace the machine pad: If the machine pad is aging, the machine pad should be replaced in time to absorb the engine shake. Check and replace wheel hubs: If the wheel hub is deformed, check and replace the corresponding wheel hub. Re-balance: If the tire is not dynamically balanced, it should be re-balanced to solve the problem.
Is it normal for brake discs to rust?
The main reason for the rust of the brake disc is that the metal material reacts chemically with water and oxygen in the air, that is, oxidation reaction. This reaction is particularly common in wet or humid environments, especially during the rainy season or when the vehicle is left unused for a long time. Brake discs are usually made of cast iron or cast steel, which are prone to form an oxide film on the surface when exposed to water and oxygen, that is, what we call "rust".
For whether the brake disc rust will affect the brake performance, we need to analyze it according to the degree of rust. The first is slight rust: if the brake disc is only slightly rusted, and the surface is only a thin layer of rust, then this degree of rust on the brake performance is almost negligible. When the vehicle is driven and the brake pedal is pressed, the friction between the brake pad and the brake disc will quickly remove this thin layer of rust and restore the normal working state of the brake disc.
The second is serious rust: however, if the brake disc is seriously rusted, and there is a large area or deep rust on the surface, then this situation needs to attract the attention of the owner. Serious rust may increase the friction resistance between the brake disc and the brake pads, resulting in reduced brake performance, and even the extreme case of brake failure. In addition, serious rust may also affect the heat dissipation performance of the brake disc and exacerbate the thermal decay of the brake system.
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