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1 braking distance
Explanation:
braking distance is one of the key parameters to evaluate the braking performance of a car, it means just as people in the case of a vehicle is in speed from the car starts to brake to a complete standstill, the vehicle is opened away. A car at a certain initial speed, emergency brake pedal from the driver starts the car completely stops the covered distance. It includes a reaction from braking distance and the two parts. The smaller the braking distance, the better the braking performance of the automobile. Because it is relatively intuitive, braking performance evaluation index thus become widely used. Proper understanding of the role of automotive braking distance to ensure traffic safety plays a very important.
National Standard:
In automobiles running, until an emergency when the driver found that the period before the occurrence of the braking action of the brake pedal depression called reactive time, the reaction time of the vehicle travel distance is called distance reaction. The length of this distance depends on the traveling speed and the reaction time, the higher the traveling speed or longer reaction times, longer reaction distance. Reaction time and directly related to the degree of sensitivity and skilled condition of the driver. The reaction time is generally 0.75 to 1 seconds, if the vehicle speed is 30 km / h, a reaction time of one second, from the reaction was 8.33 m.
the braking distance is generated when the driver depresses the brake pedal action to the car to a complete stop, the tires appear evident from the printed drag on the road. The length of the traveling speed, the braking force, the braking distance-related adhesion coefficient. The higher the speed, the longer the braking distance is proportional to the square of the traveling speed and the braking distance. Braking means after the driver depresses the brake pedal, and causes the hamper rotation of the wheel stopping force. The braking force, not only related to the brake pedal stroke, but also depends on the adhesion coefficient of the wheel with the ground, the more slippery the road (such as icy road surface), the smaller the adhesion coefficient, the longer the braking distance. Experiments show that the vehicle at the same speed, driving on different roads,Braking distance is not the same. The 30 km / h speeds on asphalt braking distance of 5.9 meters, floating on the braking distance of 17.7 m snow road surface, the braking distance on icy roads is 35. 4 meters.
braking distance requirements:
national regulations braking, braking distances are predetermined in various models at a predetermined initial velocity. More than the distance of the vehicle, the vehicle is unqualified, can not travel on the road. Traffic management during vehicle inspection, one of the most important indicator is the braking distance. Of the car (no load)
braking distance is required:
does not exceed the initial velocity of nine passenger cars of 50Km / h, there are no more than 19M;
other car does not exceed the total mass of the initial velocity of 4.5t 50Km / h is not more than 21m; when
other cars, train cars initial speed 30Km / h, no more than 12m .
braking distance by qualified personnel using specialized measuring instruments. Past that brakes, trailer tire print approach, neither the scientific, and inaccurate. Mainly the braking distance, the braking system should be inspected to prevent accidents.
Check:
Factors affect the braking distance of many, such as the brake disc (hub), shoe, the degree of consumption of the tire tread, brake fluid, brake thermal attenuation caused frequent braking, car loading conditions and the like. The brake disc (hub) is life when they are worn to a certain extent must be replaced, typically in the normal use of the urban road, their life is about 50,000 km, the life of the brake shoe is about 30,000 km , but depends on the specific circumstances of the use of the owner, it is best to check once every 10,000 kilometers.
Effect of the braking distance of the tire is relatively large, the current on each tire, has a wear indicator, when the marker is exposed, must be replaced, in addition, only three years of life of the tire, even the new tire is placed after 3 years, must also be replaced.