To judge the quality of brake pads, you can comprehensively consider from the following aspects:
First, product packaging and identification
Packaging and printing: brake pads produced by regular enterprises, their packaging and printing are usually clear and standardized, and the surface of the box will clearly mark the production license number, friction coefficient, implementation standards and other information. If there are only English letters on the package without Chinese, or the printing is vague and unclear, it may be a substandard product.
Corporate identity: The non-friction surface of the brake pads of regular products will have a clear corporate identity or brand LOGO, which is part of product quality assurance.
Second, surface quality and internal quality
Surface quality: The brake pads produced by regular enterprises have uniform surface quality, uniform spraying, and no paint loss. Grooved brake pads, the groove opened standard, is conducive to heat dissipation. The unqualified products may have problems such as uneven surface and peeling paint.
Internal quality: brake pads are made of a variety of materials mixed by hot pressing, and its internal quality is difficult to judge by the naked eye alone. However, it is possible to understand the material mix ratio and performance indicators of brake pads by requiring businesses to provide testing reports.
3. Performance indicators
Friction coefficient: Friction coefficient is one of the important indicators of brake pad performance, it determines the size of the friction between the brake pad and the brake disc, and then affects the braking effect. Appropriate friction coefficient can ensure the stability of brake performance, too high or too low may affect driving safety. Generally using SAE standards, the appropriate working temperature of the brake friction sheet is 100~350 degrees Celsius. When the temperature of poor brake pads reaches 250 degrees, the coefficient of friction may drop sharply, resulting in brake failure.
Thermal attenuation: brake pads will produce high temperatures during braking, especially at high speeds or emergency braking. At high temperatures, the friction coefficient of the brake pads will decrease, which is called thermal decay. The level of thermal decay determines the safety performance in high temperature conditions and emergency braking. Brake pads should have low thermal decay to ensure that they can maintain a stable braking effect at high temperatures.
Durability: reflects the service life of the brake pads. Usually brake pads can guarantee a service life of 30,000 to 50,000 kilometers, but it depends on the use conditions and driving habits.
Noise level: The amount of noise generated when braking is also an aspect of measuring the quality of brake pads. Brake pads should produce little noise or almost no noise during braking.
Fourth, the actual use of experience
Brake feeling: brake pads can provide smooth and linear braking force during braking, so that the driver can clearly feel the braking effect. And poor brake pads may have braking force instability, braking distance is too long and other problems.
Abnormal sound: If there is a “iron rub iron” sound when tapping the brake, it indicates that the brake pads have other problems and need to be replaced in time.
Five, driving computer prompts
Some cars have brake warning lights on the dashboard, and when the brake pads wear to a certain extent, the warning lights will light up to remind the driver to replace the brake pads. Therefore, regularly checking the driving computer prompts is also a way to determine whether the brake pads need to be replaced.
To sum up, judging the quality of brake pads requires comprehensive consideration of product packaging and identification, surface quality and internal quality, performance indicators, actual use and driving computer tips and other aspects.
Post time: Nov-22-2024