1) Listen to the sound: If there is a slight sound of "iron rubbing against iron" or a clamoring sound when you lightly brake, the brake pads must be replaced immediately. Because the limit marks on both sides of the brake pads have directly rubbed against the Petrol Car brake disc, it proves that the brake pads have exceeded the limit.
In addition, some brake pads of poor quality have hard spots, which will also produce abnormal noises. Generally, the abnormal noises produced in this way will disappear after a period of grinding.
2) Usually, whether the Petrol Car brake disc warning light on the dashboard is on is used as a basis for judging whether the Petrol Car brake disc should be replaced. Generally, the indicator light is off. When the Petrol Car brake disc fails or is excessively worn, the light is on and goes out after repair. When the warning light comes on, the Petrol Car brake disc has been worn to the limit, the braking effect has decreased, and it greatly affects driving safety. Therefore, we recommend that you regularly check the wear condition of the Petrol Car brake disc to see if it can be used, instead of just trusting the warning light.
3) Check the thickness: Most Petrol Car brake disc products have wear indicators, that is, there will be 3 small pits distributed on the disc surface. The depth of the small pit measured with a vernier caliper is 1.5mm. In other words, the total wear depth of the Petrol Car brake disc on both sides reaches 3mm. When the quasi-wear and complete wear shown in the figure below appear, we recommend that the Petrol Car brake disc be replaced in time.
Of course, not all Changan Car brake discs have wear indicators. We can use our fingers to touch the outer edge of the disc to determine the approximate depth. Generally speaking, if the total wear depth of the Petrol Car brake disc on both sides reaches 3mm, the Petrol Car brake disc should be replaced in time.
In addition, when the Changan Car brake discs (drums) on both sides use different brands and specifications, the friction effect is different, resulting in different braking effects on both sides, which will lead to the adverse consequences of brake deviation, poor braking effect and long braking distance. Therefore, it is recommended to replace the coaxial brake pads (shoes) on both sides at the same time to ensure the same braking effect.