In addition to the rust-like conditions that we can easily see, we also pay attention to two aspects of the brake system inspection. The first is the thickness of the brake pads. The minimum thickness of the brake pad is approximately 2 or 3 mm. Under this restriction, it must be replaced. At present, when the brake pads are too thin, many models will prompt the position of the brake warning lights to facilitate relative self-test. There is no need to worry about vehicles without a brake alarm because the brake caliper will have a protruding position near the thinnest thickness, generating brake noise to warn the driver.
If it is a drum brake, you can hear the sound of the brake accompanied by the "iron iron" sound, or check that the position of the hand brake becomes high, then the brake pad must be replaced immediately.
Another important consideration for brake system inspection is brake fluid. High quality brake fluid is critical to safety and braking system performance. In order to change the brake fluid regularly, all brake fluid removed from the system should be discarded and cannot be reused. You should buy better quality brake fluids on the market. If the brake fluid gets dirty, release and flush the entire system and fill the master cylinder with new liquid. If you always use brake fluid for a long time and you always add it, then obviously your brake system has problems and you should check it out.