Bodies dust on discs: complete diagnosis and methods of elimination

The black plaque that covers the wheels after each trip is a familiar pattern to most car owners, and many people see it as an inevitable evil, believing it should be, and simply washing the wheels more often. pulpIt is a direct indicator of the processes occurring in the braking system of your car.

Dust formation is the result of friction of the pad material against the metal surface of the disc. When intense braking, the temperature in the contact spot can reach several hundred degrees Celsius, which causes microscolic destruction of the pad material. Particles of this material settle on the disc and spokes of the disc, creating a characteristic dark coating.

While a small amount of dust is considered normal in standard braking systems, excessive amounts of dust can signal problems, such as poor consumables, jamming calipers, or simply an aggressive driving style, and understanding the nature of this phenomenon will help you not only maintain the aesthetic appearance of the wheels, but also prolong the life of the braking system.

Physics of the process: why plaque is formed

The mechanism of brake dust formation is quite simple from a physics perspective, but it's complicated in chemistry. When you press the brake pedal, the pads press with force against the rotating disc. kinetic The friction material of the pad, which is a mixture of metals, graphite, resins and other components, begins to wear off.

The microparticles that form have a temperature and are often welded to or deposited on the surface of the disk under electrostatic forces, which is why it is almost impossible to remove the old plaque with plain water — you need a chemical reaction or mechanical action. The composition of the dust depends on what your own is made of. brake-pad.

There are several types of materials, and each one of them dusts differently. Organic pads, for example, can create a lot of dust, but it's usually lighter and easier to wash away. Metal compounds give less visual pollution, but can be more abrasive to the disc. It's important to understand that dust is not just dirt, it's a matter of the past. wear-out your braking system.

• ⚙️ Temperature: The higher the braking temperature, the more intensive the degradation of the friction layer and the formation of sofa occurs.
• 🧲 Magnetic properties: The iron particles from the disc and pad have magnetic properties, which causes the dust to stick to the metal more strongly than ordinary road mud.
• 💨 Aerodynamics: The airflows created by the rotating wheel carry hot particles throughout the disk surface and the inner part of the wheel.

⚠️ Attention: If you notice that the discs' pad dust has appeared abruptly and in huge quantities after the brake elements have been replaced, it may indicate that the material has been laundered or defective. Give the system time to adapt, but monitor the braking efficiency.

Interestingly, modern manufacturers try to minimize this effect by adding special lubricating additives to the composition of the pads, but it is impossible to completely eliminate the formation of dust without compromising the braking specifications. Normal is the condition when light flying appears after 500-1000 km run, and not after each trip around the city.

Types of brake pads and their effect on pollution

Choosing brake pads is always a trade-off between cost, braking efficiency, service life and the amount of dust that forms. Understanding the differences between materials types will help you predict how clean your discs will remain after installing new components.

The most common are semi-metallicThey contain 30 to 65 percent metal (steel, copper, iron) that are great for heat removal and stable braking, but they are the most common source of abundant black dust that can even change the color of the lacquer on expensive cast discs over time.

They are opposed to them. Non-Asbestos Organic (NAO) They're made of Kevlar, fiberglass, rubber and carbon compounds. They work quieter and create less dust, but they wear out faster and can swim when they get overheated. The third type, ceramic pads, is considered a premium solution. They produce a minimal amount of light dust, which is almost invisible on disks, but costs much more.

When choosing new shoes, pay attention to the labeling. Often manufacturers specify friction coefficient and temperature regime. If you care about the appearance of the wheels, it makes sense to overpay for low-dust compounds. However, remember that even the best ones will dust if the caliper is not working properly.

Diagnosis: Normal or Faulty?

How do you distinguish natural wear and tear from technical malfunction? First of all, note the uniformity of the plaque distribution, if one disc has a much thicker dust layer than the other, or if the plaque is only present on the inside of the disc, this is a cause for concern.

Excessive dust formation often accompanies a phenomenon known as caliper wedging, where the caliper guides sour or rust, the pad doesn't move completely away from the disc after the pedal is released. There's constant friction, the temperature rises, and the temperature rises. disk-dust It starts to rain down, and it not only spoils the look, but it also causes the brake fluid to overheat and wear out more quickly.

Another worrying symptom is the change in dust color, and if you see a bluish or rainbow hue on the disc instead of the usual gray-black color, it indicates a critical overheating, and the metal of the disc has begun to change its structure, which can lead to microcracks and reduce the effectiveness of braking in an emergency.

To accurately diagnose the system, you can use a pyrometer immediately after the trip, the temperature of the discs on one axis should be approximately the same, a difference of more than 30-40 degrees Celsius indicates a problem in the mechanism.

• 🔍 Visual examination: Remove the wheel and check if there are traces of deep abrasion on the disc in the form of concentric furrows.
• 👂 Acoustic control: Whistling or grinding when moving without pressing the brake pedal is a sure sign of constant contact.
• 🌡️ Smell: The constant smell of burning after the trip indicates that the pads do not open completely.

⚠️ Attention: Never ignore a situation where one wheel drive heats up much more than the others, which can lead to boiling of brake fluid and complete failure of the brakes on the heated car.

Methods of cleaning brake discs and calipers

Regular cleaning of the brake system is not only a matter of aesthetics, but also a necessity for maintaining functionality. A thick layer of sintered dust can disrupt the heat sink and even cause the steering wheel to beat when braking. To clean properly, you will need to remove the wheels and, ideally, dismantle the pads themselves.

The main means of removing the stain is a special brake-cleaner (Brake Cleaner) It's an aggressive solvent that is sprayed under pressure, it effectively dissolves oily deposits and washes away dust, and it's important to use a film-free tool, because any fatty film on the disc is not acceptable.

The cleaning process must be thorough. First apply the cleaner to the disc and caliper profusely, let the chemistry work for 1-2 minutes. Then use a hard brush (not metal so as not to scratch the disc) to remove persistent impurities. After that, wash the surface again with a jet of cleaner or pressure water.

It is believed that for cleaning can be used gasoline or kerosene. This cannot be done categorically.These substances can damage the rubber calipers and cuffs, leading to leakage of brake fluid. Use only specialized autochemistry designed for rubber components of the brake system.

After cleaning and assembly, be sure to perform several intensive braking at low speed to dry the discs and remove any residues of chemistry, which will also help restore the working layer on the pads.

Disk Protection: Should You Use Coverage?

In the pursuit of clean wheels, many motorists are asking: can we protect the wheels from dust? The market offers various sprays and protective compounds, the principle of which is to create a thin layer that prevents dust particles from sticking to the surface of metal or varnish.

But there is an important nuance here. The application of any protective compositions on the working surface of the brake disc (the part where friction occurs) is strictly prohibited. This will lead to a sharp drop in the coefficient of friction, the appearance of vibrations and, in the worst case, the brakes fail. Protectives can only be applied to the outer, non-working part of the disk (the hub, the hat) and on the wheels themselves.

Wheel discs are great for ceramic coatings or special polymers, which fill the micropores of the varnish, making the surface smooth, the dust becomes nothing to catch, and when washed, it is easily washed away with water without the use of aggressive chemicals, and this is especially true for owners of cars with open-designed discs, where the caliper is visible very well.

Type of coating	Resilience	The dust-fighting effect	Where to apply
Polymer spray	1-2 weeks	Medium.	Cast discs, calipers (coloured)
Ceramic coating	6-12 months	Highly	Cast and forged discs
Wax polymer	1 sink	Low.	Temporary protection before the exhibition
Graphite lubrication	Before the pads are replaced	No (for ends)	Only the ends of the pads and guides

Use of use graphite-lubricant Or a copper paste for the ends of the pads and guides is a great way to reduce the likelihood of boiling and reduce the creaking, and while it doesn't directly prevent dust from forming, it keeps the mechanism working properly, which indirectly affects the uniformity of wear and dust.

Prevention and proper care of the system

To minimize the problems associated with the dust of the underwear, an integrated approach is important. Start with the choice of quality components. Cheap pads of unknown brands often contain excess metal shavings, which leads to accelerated wear and heavy dusting. Investing in good brakes pays off not only cleanliness, but also safety.

Regular maintenance of calipers is key, and every time you replace the pads (or every 30 to 40,000 km) you need to remove the caliper, clean the guides of old lubrication and dirt, and lay down fresh lubricant that is resistant to high temperatures, which will prevent pecking and ensure that the pads run freely.

How to properly wash wheels with brake dust?

To effectively wash brake dust-covered wheels, use a two-phase method. First apply a special brake dust cleaner (it often changes color to purple, reacting with iron). Let it work for 3-5 minutes, but do not let it dry. Then rinse with a powerful water pressure. Only after that use shampoo and sponge. This will prevent scratching the varnish with abrasive particles.

And it's also worth mentioning the importance of burning new pads, and after you install new pads, you need to do a laundry procedure, which involves a series of braking at different intensities, which allows you to create a uniform working layer on the disc and the pad, which reduces the likelihood of local overheating and, as a result, reduces dust in the future.

And don't forget about driving style. Aggressive driving with frequent, sharp braking down the floor significantly reduces the life of the brake system and increases the amount of dust. Try to brake in advance and smoothly using engine braking on long descents, which will keep your discs, pads and wheels at their best.

Frequently Asked Questions (FAQ)

Can you oil brake discs or WD-40 so they don’t rust?

Absolutely not! If oil, lubricant or WD-40 hits the disc surface, it will cause the brake effect to be lost. The wheel may lock or the brakes will stop working. The rust on the non-working part of the disc (the hub) is permissible, and on the working surface it will wear off after the first braking.

Why do the brakes start to creak after washing the car?

Water falling on heated discs can cause extreme temperature changes and deformation, but more often, creaking after washing is associated with the fact that the water washes away the natural layer of soda, and friction becomes more rigid. Water can also get between the pad and the disc. Usually creaking passes after several braking when the surface drys.

Is brake dust harmful to health?

Yes, brake dust contains microparticles of metals (copper, iron, antimony) and asbestos (in old pads) or phenolformaldehyde resins. Inhalation of this dust in high concentrations (for example, when working in an enclosed garage without ventilation) is harmful to the respiratory system. In normal car operation, the risk is minimal, since the dust dissipates in the atmosphere.

How often should brake discs be changed?

The disks are typically 2-3 sets of pads, but it depends heavily on driving style and road quality. If the disc thickness is lower than the minimum allowed (as indicated on the disc itself) or if deep furrows and beatings appear, the disc needs to be replaced. Regular cleaning of dirt and thickness checks will help to prolong their life.

Is it true that black discs are better at slowing down?

No, the color of the plaque does not affect the effectiveness of braking. However, if the layer of coar becomes too thick and sintered (glazed), the friction coefficient may fall, and the effect of "hanging" the pedal will appear. The working surface should be clean, matte and without deep damage.