The interpretation of the new regulations of the GB7258-2017

The vehicle braking system (brake) is a vital part of driving safety. The forthcoming "GB7258-2017" sets new regulations for disc brakes on the front wheels of dangerous goods transport vehicles, semi-trailer trucks for dangerous goods transport, and three-axis fence type and silo type trailers.

Although the new “GB7258” was implemented on January 1, 2018, different regulations gave a transitional period. Since January 1, 2019, new cars for semi-trailer transport of dangerous goods were equipped with disc brakes (disc brakes). Since January 1, 2020, the new production fence type and warehouse type semi-trailer is equipped with a disc brake (disc brake).

Wagons and hatches with trailers and brakes GB7258 interpretation of new regulations

- The requirements for disc brakes shall be fitted to all wheels of semi-trailer, three-axle, and silo-type semitrailers for the transport of dangerous goods (see 7.2.6).

7.2.6 The original text is as follows: All wheels of vehicles (except three-wheeled vehicles), motorcycles (excluding three-wheeled motorcycles), and trailers (excluding trailers with a total mass of not more than 750 kg) should be equipped with brakes. Among them, the front wheels of all special school buses and dangerous goods transport goods vehicles, and the front wheels of other passenger cars with the length of more than 9m, and all the wheels of dangerous goods transport semi-trailers, three-axle fence type and warehouse gate semi-trailers shall be equipped with plates. Brakes.

● Dangerous goods carrier front wheel and trailer with disc brake

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This provision directly settled the front axle and trailer axle of the dangerous goods transport tractor, and the front axle of the bicycle, all must be equipped with disc brakes. Compared with the drum brakes that are well known in the past, many card members have doubts about the disc brakes.


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Compared with the drum brake, the disc brake has a flat working surface and heat dissipation on both sides. In addition, there is a ventilation cavity in the middle. The disc rotates easily and does not easily deform. The brake performance is relatively stable; and the drum brake is unilaterally transmitted. Heat, a large temperature difference between the inner and outer sides, resulting in easy deformation of the brake drum, while a long brake, the brake drum due to high temperature caused by high temperature carbonization of the brake pad, the friction coefficient decreases, brake performance weakened.

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Dangerous cargo transport vehicles are flammable, explosive, highly toxic or highly corrosive because they are loaded with cargo. The requirements for consistency between tractors and trailers are high, and trailers equipped with disc brakes are associated with ABS and hydraulic power. Speed ​​brakes and other auxiliary brakes cooperate with each other to ensure the stability of the entire vehicle brake and improve the safety factor of dangerous goods vehicles.

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Although the rear axle brakes for tractors and bicycles on semi-trailers for semi-trailer goods are not clearly defined, the best way to resolve the entire vehicle braking time and consistency of braking effect is to use disc brakes for all vehicles. This regulation has been implemented on new production vehicles since January 2019.

● Three-axis fences and warehouse gate trailers are equipped with disk brakes

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The three-axis slat-type and slat-type trailers are all equipped with disc brakes. This article seems to be somewhat radical. At present, domestic semi-trailer trucks for general cargo transportation users, the main trailers used are slat type and warehouse type, and These two kinds of trailer standard disc brakes, it is really necessary to increase the cost of the car.

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For tractors, the regulations do not mandate the installation of disk brakes. The tractors use drum brakes. The trailers use disk brakes. There may be problems such as inconsistent braking time response and uneven braking force distribution. In order to ensure braking safety, customer needs are ensured. And the development of the entire truck brake system, card friends may choose to buy a vehicle directly equipped with disc brakes.

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Disc brakes have the advantages of short response time, uniform brake force distribution, easy maintenance, etc., and better cooperation with ABS, engine brakes, hydraulic retarders, etc., but in the areas of maximum braking force and continuous braking time, etc. Unlike drum brakes, trucks in developed countries and regions such as the United States and Europe are not fully disc brakes, and trucks equipped with disc brakes are equipped with extremely effective auxiliary brakes such as engine braking and hydraulic power. Such as speed, truck manufacturers will according to the actual needs of users, the assembly of drum or disc brakes.

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Although only the standard disc brakes on the trailer, the tractor can be dispensed with, but for reasons such as safety considerations and brake force distribution, it is believed that most cardmates will choose to deploy disc brakes in their vehicles when selecting a new car. Safety is indeed worth doing. The transition period for the disc brakes and gate-type semi-trailers equipped with disc brakes is 2 years. Since January 2020, new production vehicles have been implemented.

The new "GB7258" will be equipped with disc brakes as a mandatory requirement for dangerous goods transporters, slats, and silo-type trailers. In the future, the majority of retail customers will use the standard disc brake as a foregone conclusion, but the disc brakes Maintenance, maintenance, and maintenance are still not very mature. Therefore, it takes a while to fully configure the disc brakes.


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