In modern society, the car has become an important tool for people to travel. In the braking system of the car, the disc is an indispensable part, which can provide stable braking effect. However, in certain situations, there are also some types of vehicles that can achieve braking functions without the use of the disc. Some types of vehicles that can be used without a disc are described below.

First, let's talk about some non-motorized vehicles. Non-motor vehicles mainly refer to human-driven means of transportation, such as bicycles, electric bicycles, etc. This type of vehicle is usually through people's feet or electric drive to achieve the process of forward braking and braking, so there is no need for a disc to achieve the braking function. The braking of bicycles is usually achieved by the friction generated by the pedal foot on the rear wheel, while electric vehicles rely on electric motors or electric brakes to achieve the braking effect.

Secondly, some special types of vehicles or vehicles can also achieve the braking function without using the disc. For example, scooters and skateboards usually achieve braking by stepping on and stamping on the brakes. This type of braking does not require a disc, but by stepping on the ground to create friction to slow and stop.

In addition, although some traditional vehicles use the disc, their braking function cannot be completely dependent on the disc. For example, when the train is braking, it mainly relies on the train brake and the wheel brake. Train brakes usually consist of three parts: mechanical brakes, air brakes and hydraulic brakes. The mechanical brake realizes the braking through the friction between the friction plate and the disc, but it is not the main means of train braking, mainly used for auxiliary braking when stopping. Air brake and hydraulic brake are compressed gas or liquid to realize the brake of the wheel, is one of the main ways of train braking.

In addition, some special purpose vehicles can also achieve the braking function without using the disc. For example, a crane usually uses a friction brake to achieve braking, which is driven by a motor or hydraulic control of the contact pressure between the friction plate and the disc, so as to achieve the braking effect. In addition, some ships, aircraft and other vehicles can also achieve braking by using other types of brakes, rather than relying on discs.

In summary, although the vast majority of cars need to use discs to achieve braking functions, in some special cases, specific types of vehicles or vehicles can achieve braking by other means, without the use of discs. This mainly includes non-motor vehicles, scooters, traditional means of transport such as trains and some special purpose vehicles. These vehicles use other types of brakes or frictional resistance to achieve the braking effect, thus meeting the needs of driving and parking.