I. Analysis of possible causes

1, which means that the brake system lacks necessary maintenance, there are too many impurities in the brake master cylinder, the seal is not tight, the vacuum booster pump fails, the brake oil is too dirty, or air resistance occurs after several brake oils are mixed and heated, the brake master cylinder or the slave cylinder leaks oil, and the gas storage tank or pipeline interface leaks gas;

2. The machine parts are out of order due to improper operation;

3. Due to serious overload, under the action of gravity acceleration, the inertia of vehicle motion increases, which directly leads to brake failure.

Second, the treatment method

1. According to the road conditions and speed control direction, disengage the high gear, and at the same time blow a foot of empty oil quickly to change the high gear into the low gear. In this way, the engine will have great traction resistance to quickly reduce the speed. In addition, the handbrake should be used in conjunction with the low gear, but it should be noted that the handbrake should not be too tight or pulled too slowly. If it is pulled too tightly, it is easy to make the brake disc "locked", which is easy to damage the transmission parts and lose the braking ability; If it is pulled too slowly, the brake disc will be worn and ablated and lose its braking function.

2. Make use of the friction and collision between rigid parts such as car bumper and carriage and natural obstacles (rocks, trees or soil slopes) on the roadside to achieve the purpose of forced parking to avoid risks and reduce accident losses as much as possible.

3. If the brake fails when going uphill, it is necessary to lower to the middle and low gear in time to keep enough power to drive uphill and stop. If you need to park on a half slope, you should keep the forward low gear, tighten the handbrake, and the vehicle attendant should block the wheels with stones, skids and other things in time. If there is a reverse direction, the rear of the car should face the hillside or the safety side, and turn on the headlights and emergency lights to attract the attention of the front and rear vehicles.

4, downhill braking failure, unable to use the vehicle itself to control the speed, the driver should decisively use natural obstacles, such as roadside rocks, trees, etc. , causing resistance to the car. If you can't find suitable terrain and objects to use at the moment, in an emergency, you can move one side of the car body close to the hillside, increase the resistance through friction and gradually reduce the speed.

5. When the vehicle is going down a long slope or steep slope, step on the brakes no matter what. It can not only test the braking performance, but also win the control speed when the braking fails, which is also called predictive braking.

Third, preventive measures.

Don't neglect the daily maintenance of the brake system. In order to prevent brake failure, please maintain the brake system in time. Regular maintenance and repair are essential. For the sake of life safety, we must not neglect regular maintenance and repair.

Note: always check whether the brake shoes are in good condition, and don't use the brakes excessively. When going downhill, shift to a low gear, drive the car with engine braking, supplemented by foot braking; Avoid serious overload behavior and prevent brake failure.