Signs of brake pad wear in most cases, you don't need to remove the wheel to check the wear of the car's brake. You can see the brake pad from the gap between the wheels. If the brake pad looks particularly thin, it basically needs to be replaced. There is a small groove in the middle of some brake pads, which is also an indication of the wear degree of brake pads. If the small groove is basically worn out, you need to replace the brake pad with a new one.
In some cases, you may need to remove the wheel, and then you can check the brake pads through the inspection port of the brake caliper. Since the wheel has been removed, the thickness of the brake pad can be checked accurately. If you want to further check the condition of the brake pads, you need to remove the brake caliper from the brake disc, but you'd better drive the car to the repair shop and ask the technician to do it.
The amount of brake dust is also a feature of brake wear. If you notice that the brake dust is suddenly reduced, it is possible that the brake has been worn out and only the base metal is left. Sometimes you can also know the wear degree of the brake through your ears. If you hear the harsh sound of metal scraping when stepping on the brake, it is an indicator that the brake has been worn to the point where it needs to be replaced. The brake wear indicator is a small metal spring that is specially designed to indicate that the brake needs to be replaced. When the brake pad is worn to a certain extent, when you step on the brake, the small spring pad will contact the brake disc, making a harsh sound. Wear indicator design is a good idea. He can remind you to replace the brakes before they are excessively worn.