Types of brake discs and structure analysis.

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Types of brake discs and structure analysis

Tendons of the car —- brake system

The core components of a motor vehicle are the engine and transmission. In the eyes of tuning enthusiasts, the first task after purchasing a new car is to put enough effort into the “four legs”. One of the essential things is the brake system

The brake system includes brake calipers, brake discs, brake pads, steel pipes, brake fluid, etc.

Today, we are not talking about the dazzling brake calipers, but the brake discs are hidden behind the calipers. The main purpose of modifying the brake system is of course to optimize the braking performance, as the modified car has a certain increase in horsepower and torque compared to the original state, to run fast and also to brake, is a long mentioned phrase in the modification circle. Of course, not only modified cars have brake system modification needs. In fact, a modified braking system also applies to most civilian cars, who do not want to be safer it

This article focuses on

1. Brake disc classification
2. Floating brake discs
3. Installation of brake discs
4. Ventilated brake disc structure analysis

Classification of brake discs

With the evolution of the automobile industry, drum brakes are becoming less and less common, and in family cars, they can only be seen in the rear brakes of some low-end cars. Most of the models use disc brake structure, the advantage of disc brake structure is more reflected in the frequent braking process, better heat dissipation effect, thus reducing brake thermal decay

Our common brake discs are classified as follows
Solid discs ventilated discs perforated ventilated discs scribed ventilated discs floating ventilated discs ceramic ventilated discs among the most common mass production models, most of which are front ventilated discs and rear solid discs. Also in line with the brake strength of the front seven after three principles of calibration, in the car braking process most of the brake strength is from the front braking system, then the front row using higher specifications, it is only natural that it should be

Floating brake discs
When buying a car, the brake disc configuration is often overlooked, most people see that as long as the front and rear disc brakes are good, but do not know that many luxury brands today have been equipped with front floating brake discs as standard

The advantage of floating brake discs is that the car generates a lot of heat value during the high-intensity braking process, thus making the physical phenomenon of thermal expansion and contraction of the brake disc, deformation, which affects the normal braking effect, which is also one of the main factors of thermal decay. The floating brake disc, however, is not directly locked with the center disc, or the floating part and the disc have a slight space between them, and after locking the disc surface and the center disc still have a gap and can be shaken from side to side, but can really fix the center disc and the disc, so the design can solve the problem of overheating and shaking.

Floating brake discs, compared to two-piece discs, are lighter in weight and have greater braking stability

However, it should be noted that the structure of floating brake discs is relatively more complex and requires higher standards of precision workmanship, which cannot be achieved by small workshops. So recognize the genuine product, don’t try to be cheap!

Ventilated brake disc structure analysis (focus)

As the name implies, a ventilated brake disc is ventilated and can provide better heat dissipation than a solid disc. The side of an ordinary ventilated disc is as flat as a solid disc, and the ventilation holes can be seen in the longitudinal direction, and the structure inside is intricate and alternating, because it is necessary to ensure the heat flow distribution and the steel of the brake disc at the same time.

The main function of the scribed line in the brake disc is to scrape down and discharge the brake powder from the brake pads through the scribed line groove, so that it affects the brake friction as little as possible.

The main purpose of perforated brake discs is to provide stronger heat dissipation. Higher intensity braking will result in a sharp increase in brake disc temperature, so more air flow is needed for heat dissipation, and the effect of ventilated discs alone is no longer sufficient, usually with multi-piston brake calipers, more efficient perforated ventilated discs are needed.

Many car enthusiasts know little about the structure of the brake disc, and the above points may be clear to friends who love cars. However, even some service technicians are not completely thorough about the design of the air guide slot. As you can see from the above diagram (ventilation disc diagram), the ventilation slots are not directional, and the installation of this ventilation disc is not as elaborate as that of a brake disc with guidance.

The role of the longitudinal air guide slot of the ventilated disc is not for air intake, but for exporting high heat airflow. In the above diagram, you can see the direction of the air guide slot. The air enters the brake disc through the perforation, mixes with the hot air, and then throws out the hot air through the longitudinal air guide slot. So the efficient way to install the brake disc, for example, the above picture (Mercedes-Benz G500 retrofit brake kit) should be the longitudinal air guide slot to the back

The scribing groove of this brake disc is counterclockwise, so it will cause slight wear to the brake pads. If you care, you can also reverse the brake disc, because the brake effect and heat dissipation effect of this large size ventilated scribed and perforated floating brake disc can be very efficient, plus the non-performance tuning car like Mercedes-Benz G500 does not need track level heat dissipation tuning, so it is not impossible to reverse the brake disc for a longer brake pad life cycle.

This kind of closed guide slot brake disc, theoretically speaking, is relatively not so delicate, because there is no perforated air intake, so the air in the brake disc itself is entering and leaving from the longitudinal guide slot, how to install it depends on your own preference.

Of course, the above few examples are just examples, the direction of the scribing line and the direction of the air guide slot is not a unified standard, each brand is different. Is the choice of better scraping powder effect, or more durable, depending on the person. In addition, there are OCD like clockwise supremacy of friends, I do not stop you!

Under normal (non-intense driving) conditions.

The brake discs should be replaced at every 60,000 km, and the brake pads should be replaced at every 20,000 km, and the brake fluid should be replaced at every 2 years or 40,000 km, and the brake pads should be replaced at every 2 years or 40,000 km, and the brake skin should be replaced at every 2 years or 40,000 km. This is often overlooked in the modification process. Let’s discuss the brake system in the next issue, and let’s focus on this small, unsung and important part. See you next time!

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