Why does the brake of my electric car make a harsh sound? What should we do?

1, most of the braking noise of electric bicycles comes from the rear wheels.

At present, there are three kinds of braking devices for electric vehicles: braking (braking), expanding braking and hanging back braking. At present, all electric vehicles have suspension front brakes and braking rear brakes, which are completely out of the need of low-price competition. In the process of braking, when the vehicle speed is too fast or the braking is too urgent, and the resistance required for braking is not enough, the brake handle will shrink, increasing the friction between the brake shoe and the brake disc, and a harsh "creaking" sound will be generated at this time.

Among them, the most likely to make a sound is the brake (brake). Holding the friction drum of the brake for a long time (that is, the circular iron ring inside the brake rotates with the wheel, it will be shiny and smooth, while the material of the friction plate is generally bakelite, which will be shiny, smooth and hard after a long time. Finally, the brake drum and the brake pad form mirror friction and make noise, which is the universal law of braking, and the brake pad material is better.

In addition, disassembling the rear wheel and polishing the surface of the brake pad with large sandpaper can also temporarily eliminate the noise. It is suggested to use the rising brake, which has less noise and better sensitivity than the holding brake, but the life of the holding brake is longer than that of the rising brake, and each has its own advantages and disadvantages.

Solution:

1, change a brake pad;

2. Non-radical solution: In fact, there is nothing wrong with the sound. Try to get some water in to make the brake pads wet. It is best to remove the brakes and get some rosin on the brake pads.

2. The reason why the electric car makes such harsh braking sound is also closely related to the weight and speed of the car.

The state stipulates that the weight of electric vehicles should not exceed 40 kilograms and the maximum speed should not exceed 20 kilometers per hour. The actual situation is that most electric bicycles weigh 50 kilograms and have a top speed of 30 kilometers per hour.

This is mainly because some manufacturers will show their prototypes during the appraisal. After inspection, the speed-limiting resistor will be removed in mass production. When it is sold to consumers, the speed of the car will still reach about 30 kilometers per hour, which makes the brake parts of electric vehicles overburdened and prone to red ear noise.

Therefore, in order to control this sharp braking noise, we must start with controlling the speed and weight of the vehicle, which requires the cooperation of electric vehicle manufacturers. Only in this way can electric vehicles "quietly" go on the road.

Extended data

Braking skill

Tip 1: When braking, release the brakes before the vehicle stops completely, because if you keep stepping on the brakes, the car will have a great impact when it stops. The trick is to release the brakes once before the vehicle stops completely, and then brake gently until the vehicle stops.

Tip 2: When the vehicle brakes in a corner, if you use the steering wheel to brake, the car will lose its center of gravity. Therefore, before the vehicle enters the curve, the vehicle speed can be fully reduced by braking. But if it is too late to slow down, you can use the brakes briefly according to the situation. If the wet curved road brakes suddenly, it is easy to flick the tail. You can slow down by lowering the gear of the gearbox and using the engine brake.

Tip 3: Brake in rainy days. Due to some special conditions on rainy roads, emergency braking is generally not recommended. Because although most cars are equipped with ABS system, the phenomenon of vehicle locking is greatly reduced. However, due to the wet road surface in rainy days, emergency braking can easily lead to the imbalance of the center of gravity of the vehicle and rollover.

Therefore, the performance here reminds the majority of car owners to pay attention to controlling the speed and using emergency braking carefully when driving in rainy days.

References:

Baidu encyclopedia: brakes