Abrasive materials are coated abrasives, wire-drawing abrasives, polishing abrasives, mainly for grinding, drawing and polishing the surface of the workpiece. Abrasive materials generally have high hardness, toughness and regular shape. Abrasive materials belong to the "hardware tools" category.
Abrasive materials in grinding materials usually include:
- Coating class: Steel paper grinding sheet, sand paper, sand belt.
- Nylon class: Industrial Baijie cloth, Nylon Ring Belt, Nylon Wheel, Flywheel.
- Polishing class: And other abrasive tools such as ceramic sand, polishing wax, polishing paste, cloth folding wheel, burlap wheel, polishing solution and the like.
Material for polishing materials, can be used for polishing glass, metal, leather, semiconductors, plastics, precious stones. Jade Ware. Grinding and polishing of stainless steel, etc.
Abrasive & Grinding Tool,Grinding Wheel,Metal Cutting Discs,Diamond Grinding Wheel Zhejiang Ceeto Molding Technology Co.,Ltd. , http://www.ceetomold.com
  Used car brake inspection and adjustment methods: 
  1. After turning off the engine, step on the brake pedal (about 5 times or more) to make the vacuum in the vacuum booster zero. Use your finger to slightly push the pedal to measure the free travel of the pedal. The free stroke of the brake pedal is 3~7mm. If it does not meet the specified value, it needs to be adjusted.
2. Measure the pedal height, which is the distance from the center of the pedal to the dash panel. The specified value is 176~181mm. If it does not meet the specified value, it should be adjusted. Need to disassemble the brake light switch wire plug, loosen the brake light switch lock nut, unscrew the brake light switch until there is a gap between the pedal arm and the switch, and finally connect the brake light switch wire plug.
3. Check the reserve stroke of the brake pedal. When checking, loosen the parking brake lever and make the engine run at idle speed. Depress the pedal and measure the distance between the back of the pedal and the body dash.
Some people say that the Japanese car brakes are soft and the German car brakes are sensitive. When the brakes are applied, the car nods. Is that used car brakes soft and hard? 　
　
  The soft and hard brake is the relationship between the brake pedal's strength and the speed of the actual vehicle's brakes. The brakes are hard and fast, and they frequently nod, but if the emergency brake is encountered, its response is more sensitive. The brake responds more quickly. Brake soft braking force is easier to control when driving at low speed, the disadvantage is that when the larger braking force is needed, the pedal stroke is longer and requires more force. In short, brake soft and hard and personal driving habits are related.
If you feel that the brakes are soft, how can you adjust the stiffness? (The following is for disc brakes, so it is all self-adjusting, only the drum brake can be adjusted) 
  1, the ignition car, stalls do not have to move, pull the handbrake;
2, the brakes step in the end, and then loose feet, repeated 6-7 times, you may hear a voice of gas;
3, the end of the operation, the brake adjustment is completed, this time driving the brakes is already very hard.
How to maintain the car brake system? 
  1. Replace brake pads regularly. The braking effect is determined by the brake pads. Generally, the life of the brake pads is about 30,000 kilometers. Of course, it is also determined based on the driving conditions of the vehicle. It is advisable to check once every 10,000 kilometers.
2, regular replacement of brake oil. Brake oil has a great impact on the brake system. It is recommended that brake oil be replaced every 50,000 kilometers.
3, timely adjustment of the car when the deviation. When the brakes have obvious deviations from the wheels, it is very likely that they are caused by the braking system. The brakes must be adjusted in time.
4, avoid sudden braking. Usually in the driving experience in emergency braking, but this is a great damage to the brakes, it is best to use the brake.
5. Listen to the sound of the brake pads. When the brakes heard the sound of grinding tin, indicating that the brake pads have been ground to the brakes, and immediately replaced.
Recently, a netizen called Xiaoi, saying that the used car had just hit the wall. The key was not to mistake the throttle for braking. When the car was started, while lifting the clutch, it gave a bit of oil and the car smashed out. In fact, the clutch contact point of each car will be different, especially the used car just bought, the driver does not adapt to the vehicle, but also worried about turning off the big foot refueling, resulting in the vehicle out of control. Therefore, after buying a used car, the first thing to do is to adjust the brakes. After all, it is related to safety issues. Then the first car network is a small i to teach everyone!