Brake fluid DOT-4: which is better composition. What kind of brake fluid to fill?
responsible for the safety of the driver and passengers while driving. It consists of a large number of components and components. Balanced work of all components of the system - this is what you need to strive for. We will talk about what DOT-4 brake fluid is, which is better and what to look for when choosing. And we begin with the fundamental concepts.
About brake fluid and its functions in the system
When the driver presses the brake pedal, the pads are pressed against the discs, so the car stops. During braking, there is a huge amount of heat that needs to be removed from the system. This can be realized with the help of a special liquid. It must have a variety of properties. It:
- low compressibility;
- high boiling point;
- stable viscosity;
- low absorption level;
- Do not cause damage to rubber gaskets and seals.
All these properties are required for effective brake system operation. And as cars are constantly being improved, their power and mass increase. Accordingly, the braking force must be high. Hydraulic brakes in this regard are most preferred. They work quickly and gently, as well as very reliable. Brake fluid needs to be updated. Today there are DOT-3, DOT-4 and DOT-5.1.
What is very important
The boiling temperature is one of the most basic indicators of high-quality brake fluid. The fact is that because of the heat given off by the pads and the disc to the system, ordinary liquid will boil. This leads to the appearance of bubbles in the system and the formation of an airlock or complete failure. On the road, this situation is likely to lead to an accident.
That is why manufacturers of brake fluids are trying to maximize the boiling temperature. After all, it gives more reliability. We all know that the viscosity characteristics of a fluid vary with its temperature. This should not happen in brake fluid.Let's take a closer look at what DOT-4 brake fluid is, which is better, and other important points.
Difference between DOT-3 and DOT-4
Brake fluid DOT-3 is gradually being decommissioned. This is due to the emergence of more sophisticated compositions. A feature of DOT-3 is its low cost due to the presence of dihydric alcohols (glycols). This component significantly increases the hygroscopicity. Consequently, over time, water appears in the system, and this leads to a decrease in the boiling point and the appearance of corrosion.
A more modern and high-quality brake fluid - DOT-4, which consists of esters and boric acid. Acid neutralizes moisture on contact, so there is no such disadvantage as hygroscopicity. Consequently, the system can remain unattended for a considerable time, because the boiling temperature does not change for a long time.
DOT-5.1 brake fluid and its features
The main difference is the higher boiling point. The chemical composition is similar to DOT-4. It is often used in racing cars and motorcycles, where high speed develops and prolonged intensive braking is characteristic.
It is worth remembering the rules for mixing brake fluids.If DOT-3 is filled, then DOT-4 and DOT 5.1 can be topped up. And if in the DOT-5.1 system, only the analog is added. Failure to comply with this rule can lead to system jamming and failure of the brake mechanism with all the ensuing consequences. It turns out that the compatibility of DOT-4 brake fluid is reduced to topping up more perfect DOT-5.1. This is not always convenient, albeit from a technical point of view.
What kind of brake fluid to pour into the system?
This question worries many motorists. First of all, it is necessary to follow the recommendations of the manufacturer. Most of the VAZ family cars are operated on DOT-3, although DOT-4 will be perfect for them. This is the best option both in price and quality.
At the same time, it is not recommended to use DOT-3 on foreign cars, although this is acceptable. This is due to the low boiling point, which can damage the brakes. DOT-4 brake fluid is suitable for moderate driving. Which is better? But with this we now understand.
Brake fluid "Lukoil DOT-4"
The boiling point of this liquid is 170 degrees (humidified) and 240 (dry), which is quite suitable for the standard even with a small margin."Lukoil DOT-4" in the ranking occupies a fairly high position, due to its stability and high quality. In addition, the low cost of the product makes it more affordable for the consumer.
There are practically no fakes "Lukoil DOT-4" on the market, as the products are well protected and have a low price. In general, this is a worthy contender for the title of winner, however, we will consider a few more options.
"Sintek Euro" and "Sintek Super"
This is another domestic manufacturer of quality product. Sintec Super DOT-4 brake fluid has a small temperature margin from the one indicated on the can. True, for some reason the pipeline does not add a little, but, given the quality, it is not scary.
Sintek Euro has a higher price tag, but it is significantly different from the previous brake fluid. The canister shows the temperature at which the system will work properly. But testing has shown that the liquid boils at a higher level. Therefore, we have a large stock in the temperature plan and a fairly high quality. The liquid does not change its properties with increasing temperature and calmly "works" for several years.
Castrol React DOT4 Low Temp
A half-liter bank from this manufacturer costs about 450 rubles. Not the cheapest option, but one of the best. The boiling point when wet is 175 degrees, and in the dry state - 265 degrees Celsius. According to the regulations, the replacement is made every two years of operation.
It should be noted that DOT-4 Low Temp brake fluid is excellent for use at critically low temperatures. Manufacturer specifically lowered fluid viscosity to 650 mm2/from. Looking at the test results and the characteristics of this fluid, we can say that this is a full DOT-5.1. Nevertheless, DOT-4 liquid is more in demand on the market, therefore, it is more expedient to sell it. The composition of the DOT-4 brake fluid from Castrol differs from its analogs in the additive package that increases the boiling point.
Liqui Moly Bremsflussigkeit DOT-4
This is another sales leader in the Russian market. The price tag is not as big as Castrol. A bank with a half-liter capacity of 300 rubles will cost you, which is quite a bit. The threshold for boiling fresh liquid is 250, and about 165 degrees Celsius. Viscosity - 1800 mm2/from. In general, "Likvi Moli" fits into the framework of the DOT-4 standard, but no more.However, it is necessary to give preference to Castrol, but if the funds are not enough, then Likvi Moli will work fine.
It is worth noting that the manufacturer has focused on protecting the brake system from corrosion. They succeeded in fame, as evidenced by experimental data. There is no sign of rust during the entire service life. The company also paid great attention to the lubricating properties of the liquid. It can be recommended for use in the central part of Russia and to the south. Likvi Moli can be mixed with DOT-3 and DOT-4, not recommended with DOT-5.
RosDOT-4: short review
The domestic manufacturer in this case paid special attention to the temperature characteristics. Fresh liquid boils at 255 degrees, and operated during the year at approximately 170 degrees. Dzerzhinsky plant produced a really high-quality product, which in its properties and characteristics surpassed the "Likvi Moli". The domestic product has an affordable cost and is widely distributed in all stores of the Russian Federation. Here you will not see anything unusual - this is an ordinary "tormozuha" at an affordable price.
As you can see, the best DOT-4 brake fluid is manufactured by Castrol. Despite the high cost, it is very, very good.
How to make the right choice?
Here everything is extremely simple and clear. Much depends on your riding style. If you prefer an aggressive manner of behavior on the road, it is better to choose "Castrol", which, although positioned as DOT-4, however, its characteristics speak of a higher class.
For a more relaxed and measured ride any of the domestic manufacturers is perfect. True, it is important to pay attention to the viscosity of the liquid at sub-zero temperatures. For the northern regions it is desirable to give preference to more fluid liquids.
Another important point before you decide what kind of brake fluid to fill - you need to save the brake system. In this case, it is best to choose "Liquidation Pray". It is from this manufacturer that brake fluid shows the best results. It does not lead to corrosion, but, on the contrary, protects the system from it, which is very good.
Regular system maintenance
It is very important to lubricate calipers in time, change the anthers and guides. This also applies to discs with pads that wear out during operation. The braking system on a modern car is quite complicated. Consists of ASB unit, highways, etc.All elements must be monitored. Only then you can be sure that the brakes will not fail during extreme braking.
It is recommended to use graphite and copper greases to maintain the brake system. They are needed to ensure that when replacing parts, it was easier to replace. After all, because of the high temperatures, the metal very often becomes attached, the copper spray does not do this.
As for the brake fluid, it is recommended to use the one that is prescribed by the manufacturer. Usually the manufacturer simply indicates the labeling, for example, DOT-3 or DOT-4 without any clarification. In this case, you are guided by your own preferences. The choice should be influenced by such factors as:
- driving style;
- state of the brake system;
- corrosion protection;
- product value.
Coming to completion
Brake fluid "Castrol DOT-4" is very good. But it costs a lot of money. Therefore, we often prefer budgetary analogues. There is nothing terrible about it. The main thing is to pay attention to the following details: the boiling point of a “dry” liquid must be at least 250 degrees, and “humidified — 150.If the canister shows smaller numbers, then it is better to ignore such a product. There should also be at least minimal system corrosion protection. This is extremely important, because to replace all the highways and calipers, it will fly into your penny. The medium must be either neutral or slightly alkaline, but in no case acidic.
There are quite high-quality fluids produced in Russia. These include "Felix" and "Lux". The latter option is not suitable for the northern regions, since at low temperatures it is very thick. But "Felix" - a great alternative for many. Combines the positive qualities of "Castrol", and boasts corrosion protection, like the "Liquidation Moli." So we learned what DOT-4 brake fluid is. Which is better? There is an absolute leader - "Castrol" and a few noteworthy domestic producers, on which it is recommended to stop.