• Solid disc

  • Ventilation disc

  • Perforated ventilation disc

  • Scribed ventilating rotor

  • Floating ventilation disc

Amongst the most commonly mass-produced models, the majority are front ventilated discs and rear solid discs. During the braking process, most of the braking force is generated by the front braking system. When buying a car, the brake disc configuration is often overlooked – most people don’t know what to look out for or why many luxury brands now have front floating brake discs as standard.

The advantage of floating brake discs comes in when the car generates a large amount of heat during high-intensity braking as thermal expansion and contraction of the brake discs would usually cause deformation (affecting normal braking systems). The floating brake disc, however, is not directly locked with the centre disc and there is a slight space between the floating part and the disc. After breaking, there is still a gap between the disc surface and the centre disc, and it can move left and right, but the centre can be firmly fixed. This design can solve the problem of overheating and jittering.

The floating brake disc, compared with the two-piece disc, is a lightweight and stronger braking system. However, it should be noted that the structure of the floating brake disc is relatively more complicated, and the standard is much higher which cannot be achieved by a small workshop. So look for genuine products, don’t try to get things on the cheap!

For ventilated brake discs – as the name implies – the brake discs are ventilated, which can achieve better heat dissipation than solid discs. The side of the ordinary ventilating disc is flat like the solid disc, and the vent holes can be seen from the side. The internal structure is intricately alternating because it is necessary to ensure the heat flow and the rigidity of the brake disc.

The main function of the scribing in the scribing brake disc is to scrape off and discharge the brake powder from the worn to reduce the change of it affecting the brake friction as much as possible.

The main purpose of perforating a perforated brake disc is to have a stronger heat dissipation effect. A higher-strength brake will cause the temperature of the brake disc to increase sharply, so more airflow is required for heat dissipation. Only relying on the ventilation disc is not enough, and usually in the case of multi-piston brake calipers, more efficient perforated ventilation discs are required.

Many drivers have little understanding of the structure of the brake discs, and the above points may be clear to those who love cars, though even some maintenance technicians do not fully analyze the design of the air duct or understand the differences.

As can be seen from the ordinary ventilating disk in the above picture (ventilation disk diagram), the ventilation slot has no directivity. The front and back installation of this ventilating disk is not as particular as a brake disk with directional characteristics. The longitudinal air guide groove of the ventilating plate is not used for air intake, but for deriving high hot air flow. You can see the direction of the directional air duct in the above analysis diagram. The air enters the brake disc from the perforation, and after mixing the hot air, the hot air is thrown out through the longitudinal air duct. Then the high-efficiency installation method of the brake disc, the above picture (Mercedes-Benz G500 modified brake kit), for example, should be the longitudinal air duct to the rear The marking groove of this brake disc is counterclockwise, which will cause slight wear on the brake pads. If you care, you can also install the brake disc in reverse, because its large-size ventilated and scribed perforated floating brake disc can achieve very efficient braking and heat dissipation effects, and the non-performance of Mercedes-Benz G500 Modified cars do not need track-level heat dissipation adjustment, so in order to longer the service life of the brake pads, it is not impossible to install the brake discs in reverse. This kind of closed guide groove brake disc is relatively not so particular in theory. Because there is no perforated air intake, the air in the air duct of the brake disc itself enters and exits from the longitudinal air duct. How to install it See you like it     Of course, the above example pictures are just examples. The direction of the line and the direction of the air duct are not uniform standards, and each brand is different. Whether to choose a better scraping effect, or more durable, varies from person to person. In addition, friends who have obsessive-compulsive disorder who likes clockwise supremacy, I won’t stop you   Under normal (non-vigorous driving) conditions:   Check whether the brake disc needs to be replaced every 60,000 kilometers   Check whether the brake pads need to be replaced every 20,000 kilometers   Brake oil every 2 years or 40,000 kilometres, check whether it needs to be replaced

Finally, what needs to be mentioned is the brake pads (also called brake pads). In fact, the more important thing in the brake system is the contact friction between the brake pads and the disc. This is often overlooked during the modification process. NS. In the next issue of the brake system discussion, let us focus on this little-known important small part. We will see you next time

John Doe
04th Sep 2020