Comprehensive Analysis of Brake Pad Noise: Causes, Types and Solutions
As a car owner, have you ever been troubled by the noise from brake pads while driving? Brake noise not only affects the driving experience but may also indicate potential problems with the braking system. Today, as professional sellers of brake pads, we will conduct an in - depth analysis of the brake pad noise problem for you.
I. Common Causes of Brake Noise
1. Excessive Wear of Brake Pads
Brake pads all have a wear limit. When the wear approaches or exceeds this limit, the metal warning piece on the brake pad will come into contact with the brake disc, producing a sharp metal friction sound, which prompts you to replace the brake pads as soon as possible. Generally, the normal service life of brake pads is about 30,000 - 60,000 kilometers, but the specific mileage may vary due to factors such as driving habits and road conditions.
2. Issues with Brake Pad Materials
There is a wide variety of brake pad materials, including organic materials, semi - metallic materials, ceramic materials, etc. If the brake pad material is too hard, or if it contains large - particle metal components, it is prone to generate noise when rubbing against the brake disc. For example, some low - cost brake pads use inferior materials to reduce costs, and noise problems are more common in such cases.
3. Non - standard Installation of the Braking System
If the brake pads are not installed correctly, for example, the gap between the brake pads and the brake disc is uneven, or the fixing nuts are not tightened, noise will be produced when braking. In addition, improper installation of the brake caliper piston may also cause uneven force on the brake pads, thus triggering noise.
4. Foreign Objects Inside the Braking System
During vehicle operation, foreign objects such as dust, sediment, and small stones may enter the braking system and get stuck between the brake pads and the brake disc. When braking, these foreign objects will be squeezed and rubbed, generating noise.
5. Brake Caliper Piston Malfunction
The function of the brake caliper piston is to push the brake pads to contact the brake disc to achieve the braking function. If the brake caliper piston has malfunctions such as rusting or jamming, it will prevent the brake pads from making even contact with the brake disc, resulting in noise. If the brake fluid is not replaced for a long time, it will deteriorate and the water content will increase, accelerating the rusting of the brake caliper piston.
6. Wear or Deformation of the Brake Disc
During long - term use, the brake disc will experience wear, grooves, deformation, etc. When the surface of the brake disc is uneven, the contact between the brake pads and the brake disc will be uneven, thus generating noise. Bad driving habits such as sudden braking and frequent braking will accelerate the wear and deformation of the brake disc.
II. Types of Brake Noise and Corresponding Solutions
1. High - frequency Squeak
The sound frequency is usually higher than 5kHz, and it sounds sharp and harsh, like the sound of chalk scratching on a blackboard. This is often caused by molecular vibrations when the friction material of the brake pad comes into contact with the brake disc. The solution is to replace the entire set of brake pads and check whether the brake accessories (such as caliper clips) are installed correctly.
2. Mid - frequency Squeal
The frequency is between 300 - 5000Hz, which is a relatively common type of brake noise. It may be caused by factors such as poor movement of the caliper piston, uneven working surface of the brake disc, incorrect installation of the brake pads, improper installation of the noise - reducing shim, or too low thickness of the brake disc. Solutions include cleaning and lubricating the caliper components, ensuring that the flatness tolerance of the brake disc after installation is within 0.1mm, cleaning the hub surface, performing surface machining on the brake disc if necessary, replacing the brake disc, and ensuring that the brake pads, noise - reducing shims, and accessories are installed correctly. You can also consider using noise - reducing shims or brake pads with noise - reduction functions to reduce the noise intensity.
3. Low - frequency Judder
The frequency is lower than 300Hz, emitting a deep - sounding noise, and at the same time, the vehicle may feel obvious jitter. The main reasons include uneven wear of the brake disc, poor fit tolerance between the brake disc and the hub, excessive thickness deviation of the brake disc, or damage to the brake disc. It is necessary to replace the brake disc and clean and lubricate all surfaces of the brake components according to the vehicle manufacturer's instructions.
4. Ultrasound
The frequency is higher than 12kHz, beyond the range of human hearing, and usually requires professional equipment for detection. Although it cannot be heard by the human ear, it may also mean that there are problems with the braking system. Generally, it is related to the resonance of certain components inside the braking system, and the solution is relatively complex, requiring professional personnel to conduct a comprehensive inspection and adjustment.
III. How to Prevent Brake Noise
1. Choose High - quality Brake Pads
Invest in high - quality and reliable brake pads. Although the price may be relatively high, they can effectively reduce noise problems, and at the same time, provide better braking performance and a longer service life. The brake pads of our company adopt advanced formulas and processes and have passed strict quality inspections. They not only have excellent braking effects but also minimize the possibility of noise generation.
2. Regularly Inspect and Maintain the Braking System
Regularly check the wear condition of the brake pads. It is generally recommended to check every 10,000 - 20,000 kilometers. At the same time, check the wear degree of the brake disc, whether the brake caliper piston is working properly, and whether there are foreign objects in the braking system. Replace the brake fluid regularly, generally every 2 - 3 years or every 40,000 - 60,000 kilometers, to maintain the good performance of the braking system.
3. Correctly Install Braking System Components
If it is necessary to replace the brake pads or other braking components, it must be installed by professional personnel to ensure standardized and correct installation. During the installation process, pay attention to cleaning the surface of the components, applying an appropriate amount of lubricating grease, and tightening the bolts according to the specified torque.
4. Develop Good Driving Habits
Avoid frequent sudden braking and long - term braking, which can reduce the wear of the brake pads and the brake disc and reduce the probability of noise generation. During driving, anticipate road conditions in advance and use the brakes reasonably to keep the braking system in good working condition.
Brake noise problems should not be ignored, as they may be a sign of malfunctions in the braking system. Understanding the causes, types, and solutions of brake noise, choosing high - quality brake pads, and doing a good job in the daily inspection and maintenance of the braking system can effectively reduce brake noise, ensuring driving safety and driving comfort. If you have any questions or needs regarding brakes, please feel free to contact us. We will serve you whole - heartedly.
