What are the pros and cons of brake discs with and without holes?

Perforated brake discs.

In rainy days, the effect is better, and the perforated brake disc is for better heat dissipation and reduces the impact of thermal decay on the brakes.

Brake discs are divided into single-layer non-perforated discs, single-layer perforated discs, and double-layer hollow perforated discs. Single-layer non-porous is generally widely used, and most cars are like this. The advantages are low cost, low wear of brake friction blocks, and good rigidity. The disadvantage is that the heat dissipation is not good.

Single-layer perforated is generally used for motorcycles and some cars. The advantage is that the heat dissipation is better than that of the non-perforated disc, but the friction block wears more and the rigidity is weakened if there are too many holes. Double-layer hollow holes are generally used in vehicles that require large force and long-term braking, such as sports cars and high-end trucks.

The advantage is that the heat dissipation is very good, because there are channels in the double-layer disc that can use centrifugal force.

The suction helps dissipate heat, and the stiffness is also very good. The disadvantage is that the cost is higher, and the friction block is more worn. The main function of the hole is to dissipate heat, while the main role of the slot is to strengthen the braking effect.

The performance of the brake disc with holes on it is better than that without holes, and the holes have the following advantages: 1The heat dissipation effect is good, and the braking force attenuation is very small. 2.When passing through a flooded road, the water splashed on the brake disc will immediately flow away through the hole, improving the braking effect.

One has holes, one has no holes are ventilated brake discs, the holes increase the air contact area, the heat dissipation is better, continuous braking, the thermal attenuation is not obvious, good cars and performance cars are used more, more advanced ceramic brake discs, can also be punched, the top racing F1 uses carbon fiber brake system.

Punching is designed to speed up heat dissipation, increase friction, prevent cracks from spreading over a large area, and reduce mass. All of the above is for optimal braking purposes. Hope the above is helpful to you, thanks.

The punching disc is actually DU developed by BAI for the brake pads used in the early days, and today, it is not necessary after the brake pad material is changed, but why the punching DAO hole disc is still popular, and even used in high-end cars, it is just because it looks cool. If you use it yourself and like to drive fast or off the track, it is recommended that you do not use perforated brake discs. The advantages of the perforated disc disappear, and some disadvantages must be considered:

First of all, the disc surface is perforated, and the overall strength of the brake disc is reduced. Second, because of the perforation, the friction area is reduced and the friction is lost. Thirdly, after punching, the heat conduction area on the surface of the plate is also reduced accordingly, which is offset by the effect that some people think can be cooled by using ventilation holes.

Fourth, after a period of time, fine cracks form around the ventilation holes, which is the effect of stress, and some perforated discs produce deformation and jitter, and stress is one of the main reasons. These holes in the disc surface actually become stress points, and uneven heat flow can make the brake disc suffer a severe test. For example, the car drives very fast, when turning, it is necessary to step on the brakes, accelerate in a straight line, quickly recover to high speed, and then step on the brakes in the encounter, then the brakes have experienced a great temperature change in this process, and the temperature near the ventilation hole is much lower than that of other positions, and the different temperatures on a brake disc will greatly reduce the braking effect, resulting in an unstable friction coefficient.

In some cases where the material of the disc is not good enough and the driving is more intense, the brake disc will be deformed or even broken under pressure.

1. Solid brake disc.

A physical brake disc is a metal disc used for braking. This type of brake disc has a simple structure and is cheap. However, the heat dissipation effect is poor, so the thermal braking effect is relatively poor.

2. Ordinary ventilation type.

The normal ventilated type is an improvement on the basis of the physical brake disc. The heat dissipation performance has been enhanced, and the braking effect is more stable, which is currently used in most cars.

3. Perforated brake discs.

The perforated brake disc has better cooling, shortens the braking distance, and has a more stable braking effect, which is generally suitable for high-end cars.

4. Scribing brake discs.

The dust and debris attached to the brake disc can be discharged, and the rainwater can also be discharged when the road surface is wet in rainy days, so that the car will not be affected by excessive rain on the brake disc.

5. Ceramic composite brake disc.

It is made of a mixture of carbon fiber, graphite and silicon, whether it is hot or cold braking, it has better braking performance and longer service life, and is generally used on high-end cars or high-end sports cars.

For the braking system, the most important thing is to reduce thermal decay (the brake discs and brake pads work repeatedly against each other, and the braking performance decreases as the temperature rises). Since thermal decay cannot be completely avoided, the braking system is required to maximize heat dissipation. The internally ventilated brake disc we are talking about is to improve the heat dissipation performance, and most of the passenger cars sold on the market now use the internal ventilated disc for the front brake.

Including supercars and some high-horsepower luxury cars, because of the fast driving speed or their own weight, they will generate higher heat when braking, so their brake discs in addition to the internal ventilation design, but also punch holes in the disc surface to further improve the heat dissipation performance. As long as the manufacturer thinks that a certain model of car needs to install a brake system with higher heat dissipation efficiency, it will choose a perforated brake disc, and there is no limit to the type of car.

Some modified cars will also use perforated brake discs to improve the heat dissipation performance of the braking system. However, it should be noted that punching holes on the disc surface is particular, if the punching is improper, it will affect the rigidity of the entire brake disc, once the emergency braking, the brake disc will crack from the punching, which seriously affects the safety. Therefore, if you do not have enough technology and experience, it is best not to drill holes in the disc by yourself, and it is more reliable to choose a perforated brake disc from the genuine factory.

Strictly speaking, a brake disc with holes does not need light at all.

Because the brake discs with holes are actually of a very high grade in the cast iron process.

And the punching disc that you can see in China is in addition to the pure imported parts of pure imported cars. Nothing else is eligible.

There's a lot of detail involved.

So the monolithic disc is less than 1000. Don't look at the punch plate.

And whether the disc is optical or not has no direct relationship with whether there are holes or not.

Although the price of some domestic modified plates with holes exceeds 1000, the quality is really not good.

Unless your car is over 400p or a long-term professional racer. Otherwise, there is no need to replace the punch disc.

Because the holes are punched just to dissipate heat. The heat dissipation is to ensure the stability of the brake pads.

Why are there holes in the brake discs? The holes in the brake disc are ventilation holes that are used to cool the brake disc. Drilling holes in the surface of the brake disc serves three purposes:

Accelerate ventilation and heat dissipation, improve braking efficiency; Brake noise can be suppressed; OK**. After drilling holes in the friction surface of the brake disc, the strength of the brake disc will be reduced to a certain extent. The more holes, the lower the strength and the shorter the service life.

In addition, a right-angled "cutter" is actually formed between the drill hole and the friction surface. When the brake pads are tightly pressed on the brake pads by the oil pump and pass through these small holes at high speed, in fact, the more scratched holes by these "knives" again and again, the more unbridled the cutting effect is, and the greater the brake pad loss. @2019

OK. Perforated brake discs dissipate heat quickly, and the wheel brake effect is also better than that of non-perforated solid discs. It also has the advantage of reducing the noise of the brake, because the small hole on the brake disc can remove the powder particles of friction and reduce the *** caused by the powder, thereby reducing the noise rottenness.

So the brake disc with holes can be thrown.

The advantages and disadvantages of perforated and non-perforated brake discs are as follows:

1. Most cars use a single-layer non-porous brake calendar, which has low wear and tear, low cost and good rigidity, but the heat dissipation function is not good, and the braking effect is not as good as punching.

2. Most motorcycles use single-layer perforated brake discs, and some cars are also in use. The heat dissipation performance is better than that of non-perforated discs, but at the same time, the wear of the friction block will be relatively large, and the service life will be shortened.

Main function: slotting on the brake pads, punching holes in the brake discs, through these voids and grooves, increase air circulation, improve heat dissipation performance, and quickly remove the dust generated by friction, which greatly improves the thermal decay resistance of the brake pads and makes driving safer.

The main reason: stepping on the brake for a long time, the brake pad will affect the braking performance due to the high temperature, and even lead to brake failure, so in order to improve the heat dissipation performance of the brake disc and brake pad, the brake disc is designed to punch holes and grooves.

Good point for brake disc punching and marking:

1. In terms of design principle, the purpose of the holes and engraved lines on the brake pads is to increase the surface area and the amount of ventilation directly caused by friction, and the purpose is to enhance the heat dissipation performance of the brake system and the drainage performance in rainy and snowy weather;

2. It can effectively improve the braking force. Of course, this kind of product must be produced by a regular factory with a quality assurance brand. I believe that in today's society, steering and braking are everyone's life;

3. Punching is better than scribing, because the overheating of the brake disc will cause deformation, the direction will shake, and the heat dissipation effect of the punching disc is good, so this problem will not occur. Theoretically, the maximum wear limit of the brake disc is 2 mm, and the brake disc must be replaced with a new one after the limit is reached.

However, in actual use, most car owners do not strictly implement this standard. The frequency of replacement should also be measured according to your own driving habits.