How to adjust the tightness of air brake

Cars basically use disc brakes, which are hydraulic and cannot be adjusted manually. If you feel the brakes are soft, you can check whether there is oil leakage, the content of brake oil, the thickness and quality (hardness) of brake pads. Suggest timely maintenance. For trucks, each wheel has an adjustment screw, and the adjustment opening of the rear wheel is easy to find, and it can be adjusted only with a screwdriver. In addition, the pneumatic braking system can be prevented from loosening by the following methods: 1, and the stroke of the brake pedal can be adjusted only by turning the nut under the pedal; 2. Adjust the gap. At present, the gap between the brake disc or bushing and the brake drum of most automobiles is automatically adjusted without manual adjustment. 3. When the brake pad is worn thin, it needs to be replaced. It should also be noted that the hand brake can be adjusted, but the foot brake can't. If the brakes are low, you can try to deflate. Now many cars are equipped with control units, which can be adjusted.