A：1. Observe the thickness of brake pads: generally the thickness of new brake pad is 1.5 cm, we can regularly observe the thickness of brake pads.If you can't see the brake pads, replace them in time.
1. Driving computer prompts that needs to be replaced: generally, there is a brake warning light on the dashboard of a car. When the warning light is on, it reminds you to check the brake pad, but the warning light indicates that it has reached the limit of replacement and must be checked immediately.All cars have this kind of warning system, but some have direct sensing of the thickness of the brake pads, and some have worn out the pads completely until the brake fluid drops so much that the warning lights come on.
2. Listen to the sound: the brake disc is made of iron, especially in rainy days after a long period of parking. It is easy to rust, then the brake will be accompanied by a trace of sound, this sound will disappear in driving for a period of time .If there is no improvement after a period of time, the brake pad must be replaced immediately.Because the limit mark on both sides of the brake pad has directly rubbed the brake disc, it proves that the brake pad has exceeded the limit.And in this case, the brake pad needs to be replaced and at the same time the brake disc also needs to be checked.When this sound appeared ,it indicates that brake disc is also damaged, even if you replace the new brake pad and it still can not eliminate the noise. When it turns serious situation,it needs to replace the brake disc.
3. When the brake pad thin, the car's braking time will become slow, we need to step on the brake deeper and more heavily, it can be able to achieve the previous braking effect.When you find that the braking effect in the first half of the brake is significantly weakened, the brake becomes soft, and the brake does not stop, you should check whether the brake pads need to be replaced.