In the field of car braking system upgrades, perforated discs are a classic choice based on their ultimate heat dissipation performance. It optimizes heat exchange efficiency by processing uniform holes on the surface of the brake disc. It is widely used in high-performance models, racing cars and modified vehicles with high demand for brake heat dissipation. From extreme working conditions on the track to continuous braking on mountain roads, the perforated disc has become a key component to improve braking stability with its core heat dissipation advantage.
1. The core design and working principle of the punching plate

Perforated discs are also called "ventilated perforated discs". The core design is to process through- or semi-through holes at specific intervals and angles on the surface of the brake disc body (mostly ventilated disc structures). Common hole diameters range from 6mm to 10mm. The hole layout needs to be dynamically calculated to take into account heat dissipation and structural strength. The core of its design revolves around the pain points of brake heat dissipation and achieves efficient thermal management through scientific structure:

1. Core logic: Strengthen convection heat dissipation and suppress thermal attenuation

During braking, the high-speed friction between the brake pads and the disc surface generates a large amount of high temperature. If heat accumulates, the friction coefficient of the brake pads will drop sharply, causing "thermal decay", which seriously threatens driving safety. The perforated disc builds air convection channels through dense holes on the disc surface. The centrifugal force generated when the wheel rotates will accelerate the air circulation in the holes, quickly discharge the heat from the disc surface, and at the same time take away high-temperature dust on the surface of the brake pads, significantly reducing the operating temperature of the brake disc, and inhibiting the occurrence of thermal attenuation from the source.

2. Drilling process: the choice between through and semi-through

Perforated discs are mainly divided into two processes: full through drilling and semi through drilling. Full-through holes have higher heat dissipation efficiency and unobstructed air convection. They are mostly used in professional racing cars and can cope with the high temperature test of continuous extreme braking. Semi-through holes (also known as "blind holes") are only processed from one side of the disc to the middle ventilation layer, retaining more structural area of ​​the disc. While ensuring a certain heat dissipation capacity, it greatly improves the overall strength of the brake disc and reduces stress concentration. It is more suitable for daily civilian driving scenarios and avoids cracking at the edge of the hole due to bumps on the road and the impact of foreign objects.

In addition, the holes of high-quality perforated discs are often chamfered to prevent sharp edges from scratching the brake pads, while reducing stress accumulation in the holes and extending the service life of the brake disc.

2. Advantages and limitations of perforated discs

Core advantages: Focus on heat dissipation and braking stability

- Excellent heat dissipation efficiency: Compared with ordinary solid discs and ventilated solid discs, the air convection efficiency of perforated discs is increased by more than 30%, which can quickly reduce the braking temperature. In continuous braking scenarios (such as mountain road downhill, frequent deceleration at high speed), the braking force retention is far better than that of conventional brake discs. Actual measurement data shows that after braking at 100-0km/h for 10 consecutive times with a high-carbon material fully perforated disc, the disc surface temperature is 150-200°C lower than that of an ordinary ventilated disc, and the braking distance fluctuates by no more than 5%.

- Quick braking response: The hole design reduces the weight of the brake disc itself and reduces the moment of inertia. The response is faster when the brake pedal is stepped on, and the foot feel is more linear. It is especially suitable for car owners who pursue high-quality control.

- Clean the friction surface: Under the action of centrifugal force, the holes can quickly scrape away metal dust and debris generated by brake pad wear, preventing dust from accumulating on the friction surface to form a "lubricating layer" and maintaining stable braking force output.

Inherent limitations: trade-off between performance and practicality

- Structural strength depends on material technology: drilling holes will weaken the brake disc surface structure, which requires extremely high material and processing accuracy. If ordinary cast iron is used or the drilling process is rough, stress cracks are likely to occur at the edges of the holes, especially at low temperatures and under severe braking conditions. The risk is higher. Therefore, high-quality punching discs are mostly made of high-carbon alloy materials and are strengthened by high-temperature heat treatment.

- Susceptible to foreign objects: Small stones, sand and other foreign objects may get stuck in the holes of the disc. The brake pads and disc surface may be easily scratched during high-speed braking. Long-term use may cause abnormal brake noise, so regular cleaning and maintenance are required.

- There are limitations in adapting to civil scenes: Although the full-through perforated plate has strong heat dissipation, its strength is relatively low, and it is not suitable for daily bumpy roads or heavy-load scenarios; although the semi-through-perforated plate has both strength and strength, its heat dissipation efficiency is slightly lower than that of the full-through perforated plate, so it needs to be selected according to the use scenario.

3. Applicable groups and purchase and use suggestions

Adapt to the crowd

Perforated discs are more suitable for two types of car owners: one is professional track players or enthusiasts who frequently participate in track day activities and have extreme needs for braking heat dissipation, so they can choose full-through high-carbon perforated discs; the other is self-driving enthusiasts who often run mountainous roads and long-distance downhills and need to cope with continuous braking scenarios. Semi-through perforated discs can balance heat dissipation and daily practicality. For car owners who only commute in the city and do not have high-intensity braking requirements, ordinary ventilated discs can meet their needs, and there is no need to blindly upgrade perforated discs.

Key points for purchase and use

- Adhere to high-quality materials: give priority to high-carbon alloy materials such as G3500 and G3000 to ensure that the carbon content reaches the standard, and undergo heat treatment and stress relief processes above 650°C to avoid choosing ordinary cast iron punching discs.

- Matching technology and scenarios: Full-through perforated discs are optional for track use, and semi-through-perforated discs are preferred for daily driving. At the same time, attention is paid to the hole layout, and the radial perforated design optimized by centrifugal force is preferred for more even heat dissipation.

- Precise adaptation and professional installation: Products must be selected that completely match the hole position, size, and PCD value of the original car to avoid misaligned installation; installation must be performed by professionals to ensure the balance of the brake disc, and run-in after installation to avoid damage to the disc surface caused by sudden braking.

- Regular inspection and maintenance: During daily use, regularly observe whether there are cracks on the edges of the holes and abnormal wear on the disk surface, and replace them promptly if problems are found; avoid flushing cold water when the disk surface is high to prevent cracking caused by thermal expansion and contraction.

4. Clarification of common misunderstandings

Misunderstanding 1: “The more holes you drill, the better the heat dissipation is.” In fact, the number of holes needs to be balanced with the disk area and strength. Excessive drilling will greatly weaken the structural strength and may destroy the air convection path, which in turn reduces the heat dissipation efficiency. The hole density of high-quality perforated disks is carefully calculated.

Myth 2: "The life of perforated disks is shorter than that of solid disks." If high-quality materials and craftsmanship are used, and daily maintenance is carried out properly, the service life of the semi-through perforated disc is equivalent to that of an ordinary ventilated disc. The full-through perforated disc may have a slightly shortened life due to its slightly lower strength, but it can meet the needs of high-frequency replacement on the track, so there is no need to worry too much.

Conclusion

The core value of the perforated disc is to maximize heat dissipation performance and provide stability for high-intensity braking scenarios. It is a typical choice for "targeted strengthening" in braking system upgrades. It is not suitable for all car owners and needs to be purchased rationally based on driving scenarios and needs. For users who pursue extreme braking and control quality, high-quality perforated discs are undoubtedly the key to breaking through the braking bottleneck; while for daily commuters, blind upgrades may increase the cost and risk of use. Only through rational adaptation and quality priority can the perforated plate give full play to its heat dissipation advantages and ensure driving safety.