What's the reason for the car's brakes not stopping?

There are many reasons for brake failure. First, there is a lack of necessary maintenance for the brake system. There are too many impurities in the brake master cylinder, the seal is not tight, the vacuum booster pump fails, the brake fluid is too dirty, or air resistance occurs when several types of brake fluid are mixed and heated. , oil leakage from the brake master cylinder or sub-pump, air leakage from the air storage tank or pipeline interface; second, the failure of the parts due to improper operation, such as long-term downhill, the friction and heat of the brake pads, the carbonization of the brake hub, and the complete braking function Failure; third, due to severe overloading, under the action of gravitational acceleration, the inertia of the vehicle's motion is increased, which directly leads to brake failure.
What to do if the brakes fail while the vehicle is running.
1. Control the direction according to the road conditions and vehicle speed, disengage the high-speed gear, and at the same time, quickly empty the gas and shift the high-speed gear to the low-speed gear. In this way, the engine will have a lot of traction resistance to quickly reduce the speed. In addition, the handbrake should be used in combination with the shift to a low gear, but it should be noted that the handbrake cannot be tightened or pulled too slowly. If it is pulled too tightly, the brake disc will be easily "locked", which may damage the transmission parts and lose the braking ability; if it is pulled too slowly, the brake disc will be worn and ablated and the braking effect will be lost.
2. Use the bumper, carriage and other rigid parts of the car to rub and collide with natural obstacles (rocks, trees or soil slopes) on the roadside to achieve the purpose of forced parking and escape, and reduce accident losses as much as possible.
3. If the brake fails when going uphill, you should reduce to medium and low gears in a timely manner to maintain enough power to drive up the top of the hill to stop. If parking on a half-slope is required, keep the forward low gear, tighten the handbrake, and the driver should block the wheels with stones, skids, etc. in time. If there is a backward slip, the rear of the car should face the hillside or a safe side, and turn on the headlights and emergency lights to attract the attention of the front and rear vehicles.
4. When the downhill brake fails and the vehicle's own mechanism cannot be used to control the speed of the vehicle, the driver should decisively use natural obstacles, such as roadside rocks and trees, to cause resistance to automatic slack adjuster Manufacturers the vehicle. If you can't find suitable terrain or objects to use for a while, in an emergency, you can move one side of the body closer to the side of the mountain, increase the resistance with friction, and gradually reduce the speed.
5. When the vehicle is going down a long or steep slope, the brakes should be applied regardless of the situation. It can not only test braking performance, but also gain time to control the speed of the car when it is discovered that the brakes are failing, also known as predictive braking.
6. Brake failure caused by brake pump failure (may be due to lack of brake fluid or the brake pump itself), although this situation rarely occurs, it is the most dangerous. Therefore, car owners need to carefully keep the brakes of the vehicle on a daily basis. If there is any dullness or heavy pedals, please go to a professional institution for overhaul immediately. When maintaining the vehicle, you must not forget to check the braking system.
7. The reason for the weakening of the brake caused by the vehicle itself is the mechanical wear of the brake. At present, the disc brake system is very popular. The owner should always visually observe whether there are cracks or excessive wear on the surface of the brake disc. In addition, it is necessary to follow the maintenance instructions. , Replace the brake disc at fixed mileage.
8. The disc brake system has become very popular. Car owners should always visually observe whether there are cracks or excessive wear on the surface of the brake disc. In addition, the brake disc must be replaced regularly and mileage according to the maintenance instructions.
9. The influence of engine power. This situation usually occurs in small-displacement models in summer. The principle is not difficult to understand, because in summer, car owners basically turn on the air conditioner throughout the whole process, especially for small-displacement models. When the car air conditioner is turned on, the car engine will naturally have a load, so the car brakes are heavy.