DOT 5 brake fluid – Auto Oil And Fluid

DOT 5 brake fluid: DOT 5 Artificial Brake Fluid is a specifically formulated high-temperature brake fluid that’s required in some trendy brake programs. Reduces corrosion within the brake system by offering constant braking efficiency in temperatures from -75F to +600F Protects in opposition to decreased efficiency on account of water absorption and warmth

Product Options:

Supplies constant braking efficiency in temperatures from -75F to +600F

Protects in opposition to decreased efficiency on account of water and warmth absorption

Forestall corrosion of all metals inside the braking system.

Traits of DOT 5 Brake Fluid


Not like different brake fluids, that are glycol based mostly, DOT 5 is silicone based mostly. Probably the most outstanding influence of that is that silicone-based brake fluid doesn’t take up moisture. Whereas this will likely sound like an inherent benefit of DOT 5, the reality will not be that straightforward.

It is because whereas DOT 3 and DOT 4 brake fluids take up moisture, this prevents small quantities of water from accumulating and rusting brake elements. So long as you don’t get massive quantities of water into the system, the whole lot works wonderful.

With DOT 5, small quantities of moisture can destroy brake elements and result in comfortable brakes. Nevertheless, in case you service your brakes recurrently, this isn’t that massive of an issue. DOT 5 has minimal functions and is mostly solely used if you can’t stop moisture from getting into the brake system.

Even then, you’ll must service your brakes to take away moisture buildup from the system earlier than it does any harm.


Not like DOT 3 and DOT 4 brake fluid, which is yellowish-brown in colour, DOT 5 brake fluid is purple.

This makes it simple to verify what kind of brake fluid is in your automobile, which helps decide DOT 5 brake fluid compatibility. That is particularly vital as a result of you’ll be able to solely combine DOT 5 brake fluid with particular brake fluids.

Boiling Level

DOT 5 brake fluid has a better boiling level than DOT 3 or DOT 4 brake fluid. At 500 levels, that is about 50 levels greater than DOT 4 and 100 levels greater than DOT 3. Nevertheless, except you’re driving a high-performance automobile, similar to in Formulation 1 racing, you don’t want the upper boiling level.

It’s the equal of shopping for a supercomputer to have the ability to run Solitaire. Having the additional energy does nothing for you in case you’re by no means going to make use of it.


DOT 5 is considerably costlier than DOT 3 and even DOT 4. It’s usually 3 times the price of DOT 3 and twice the price of DOT 2. This results in the misperception that it should be greater.

Nevertheless, the precise replace for many brake programs is DOT 4 or DOT 5.1. Whereas DOT 5 gives some efficiency advantages over conventional brake fluids, the drawbacks of DOT 5 brake fluid outweigh the advantages for many functions.

DOT 3 vs DOT 4 vs DOT 5 vs DOT 5.1 – Brake Fluid Variations

Brake fluids switch stress from the brake lever to the brake pads. To successfully switch power, these fluids should be incompressible. The best brake fluid ought to have a excessive boiling level, be capable of lubricate the calipers, and be proof against corrosion.

There are 4 forms of brake fluid: DOT 3, DOT 4, DOT 5.1, and DOT 5. As brakes convert kinetic power to warmth, brake fluids endure a excessive diploma of heating.

Brake fluids switch stress from the brake lever to the brake pads. To successfully switch power, these fluids should be incompressible. The best brake fluid ought to have a excessive boiling level, be capable of lubricate the calipers, and be proof against corrosion.

There are 4 forms of brake fluid: DOT 3, DOT 4, DOT 5.1, and DOT 5. As brakes convert kinetic power to warmth, brake fluids endure a excessive diploma of heating.

What’s DOT brake fluid?

DOT fluid is essentially the most broadly used kind of brake fluid at present. Polyglycol base is utilized in all DOT fluids besides DOT 5 brake fluid. Glycol-based brake fluids are made up of as much as 10 completely different elements. Fluid elements may be divided into 4 most important teams:

  • Inhibitors: Using inhibitors prevents oxidation and corrosion.
  • Modifying Coupler: Swelling of uncovered rubber elements may be managed with a modifying coupler.
  • Thinner solvent: The thinner solvent determines the boiling level and viscosity of the brake fluid. Between 50% and 80% of brake fluid is made up of it. Glycol ether is essentially the most broadly used solvent diluent.
  • Lubricant: Using a lubricant, similar to polypropylene or polyethylene, can improve the liberty of motion of elements by 20-40%.

The Division of Transportation and the Society of Automotive Engineers have set strict requirements and laws for DOT brake fluid. The Division of Transportation is the place the acronym DOT comes from.

Brake fluid efficiency in excessive temperatures is the first concern of requirements. As a part of their standards, they require fluid producers to stick to a set of minimal boiling temperatures.

Boiling factors or temperatures are the principle variations between the varied courses of DOT brake fluids. Within the brake system, a boiling level is the purpose at which the brake fluid begins to boil or evaporate.

Each brake fluid has two boiling factors often known as the dry boiling level and the moist boiling level. Heavy

and extended use of the brakes has a detrimental influence on the general operation of the braking system.


DOT 3 brake fluids are totally artificial, non-petroleum based mostly/non-mineral based mostly, non-silicone brake fluids that can be utilized in quite a lot of clutch and braking functions. Alcohol and glycerin are mixed to create this combination.

Polyethylene glycol ether is the premise for the excessive efficiency properties of brake fluid.

As a consequence of its excessive boiling temperatures, DOT 3 brake fluid ensures a dependable and secure braking expertise, even at excessive brake pressures. With this brake fluid, you gained’t have to fret in regards to the fluid boiling or thickening in excessive or low temperatures.

DOT 3 brake fluids can tolerate temperatures as much as 205°C dry boiling level and 140°C moist boiling level.

DOT 3 brake fluid has much less growth of rubber elements, which reduces fluid loss and leakage. As well as, the elements of the brake system are higher protected in opposition to corrosion, which will increase its reliability and repair life.

For heavy industrial autos, bikes, 4x4s, and passenger automobiles, this brake fluid can be utilized to refill or recharge brake and clutch programs. Agriculture, development and mining gear can profit from this fluid.

DOT 3 brake fluid must be used when prescribed by the automobile producer. The fluid is inherently hygroscopic and absorbs water from the environment, which reduces the effectivity of the product. To forestall water contamination, make sure you reseal the brake fluid bottle cap tight after opening.

Brake fluid must be modified in line with the producer’s suggestions. You shouldn’t combine DOT 3 brake fluid with mineral or silicone DOT 5.


DOT 4 brake fluids are glycol ether based mostly and comprise borate esters to extend efficiency. With borate esters, you’ll be able to have higher moist and dry boiling factors, amongst different issues.

To maintain issues easy, DOT 4 brake fluid has a better boiling level than DOT 3. In distinction, DOT 3 brake fluid loses its boiling level a lot sooner when it is available in contact with water.

Based on the desired standards, DOT 4 has a boiling level of 230°C dry and 155°C moist. Solely use DOT 4 brakes in case your brake system recommends them or if the automobile producer has particularly instructed you to take action.

DOT 4 braking programs must be changed each two years to make sure optimum security and efficiency. When the brake system is contaminated with water, its helpful life is diminished.

DOT 4 Brake Fluid absorbs moisture by means of the brake strains. As you press the brake pedal, the fluid within the system will get sizzling.

As brake fluids proceed to gather water from the environment, their boiling level will drop. The rubber elements within the wheel cylinders and grasp cylinders will corrode if the brake fluid will not be modified recurrently.

As a consequence of its glycol-based nature, you should use the identical DOT 4 lubricant with DOT 3 and DOT 5.1 with out affecting efficiency or damaging the brake system.

Nevertheless, even whether it is secure to take action, I might not advocate doing it professionally. DOT 4 replaces DOT 3, however not the opposite approach round. Earlier than refilling the reservoir with a brand new kind of brake fluid, flush the outdated fluid from the system.

DOT 5 Fluid

Among the hottest autos on the street at present use DOT 5 brake fluid, which incorporates silicone. The excessive boiling factors are the rationale for the upper value. It boils at a temperature of 260°C dry and 180°C moist.

State-of-the-art brake rotors are usually slim and compact, permitting for higher warmth dissipation. Silicone-based brake fluid is acceptable for the sort of machine, as it will possibly tolerate excessive temperatures.

A DOT 5 brake fluid doesn’t take up moisture and won’t have an effect on painted surfaces, making it best for top efficiency autos. Using this brake fluid protects the brake system from the consequences of unhealthy climate.

DOT 5 can be utilized as a alternative for DOT 3 and DOT 4; nevertheless, it shouldn’t be blended with every other brake fluid.

Silicone-based brakes are harder to bleed. Nevertheless, after bleeding, brake programs full of DOT 5 brake fluid are extra proof against oxidation and last more than these utilizing different formulations.

Low temperatures don’t have an effect on the efficiency of the fluid as a result of it’s mild. In the case of excessive temperatures, the viscosity of DOT 5 is way more secure.

There are additionally some disadvantages to utilizing DOT 5 brake fluid. When heated, it expands loads and the components can evaporate, leading to a spongier texture.

Except you clear it and substitute the seal, this fluid will not be suitable with beforehand used glycol-based fluid programs. Anti-lock brakes are additionally incompatible as silicone fluids are thicker. Silicone brake fluids begin to compress at temperatures of 150-180°C, in contrast to glycol fluids which begin to compress after they attain their boiling level.

DOT 5.1 Fluid

DOT 5.1 will not be a revision of DOT 5, as is usually believed. DOT 5.1 is a mix of borate ester and polyalkylene glycol ether, a silicone based mostly product.

In comparison with different DOT brake fluids, 5.1 Brake Fluid can stand up to greater temperatures with out changing into sticky. It outperforms every other DOT brake fluid and may stand up to greater moist and dry boiling temperatures. It’s suitable with all glycol-based brake fluids, however not with DOT 5.

In comparison with racing fluids, the dry boiling level of this fluid is round 270°C and 190°C moist. DOT 5.1 has the additional benefit of being adaptable to quite a lot of rubber compositions. DOT 3 and DOT 4 are additionally supported by it.

The drawbacks of DOT 5.1 are its water absorption, paint corrosion, and better value than DOT 3 and DOT 4. This brake fluid can also be exhausting to seek out at some auto elements shops. This brake fluid is incompatible with DOT 5 and may by no means be blended with it for any purpose.

Ceaselessly Requested Questions

Can DOT 5 and DOT 5.1 be blended?

No, regardless of the same names, DOT 5 and DOT 5.1 are fully completely different brake fluids. Break Down DOT 5 Vs. DOT 5.1 is comparatively easy. DOT 5.1 is glycol based mostly, whereas DOT 5 is silicone based mostly. This makes them fully incompatible when blended.

Are you able to combine DOT 5 and DOT 4?

No, DOT 4 is glycol based mostly, which makes it essentially incompatible with DOT 5 brake fluid. In case your fluids do combine, you’ll must flush all the system a number of instances to treatment the state of affairs.

Are you able to combine DOT 5 and DOT 3?

No, you’ll be able to solely combine DOT 5 brake fluid with extra DOT 5 brake fluid. That’s as a result of DOT 5 is the one silicone-based brake fluid; all the remaining are glycol based mostly. Utilizing the unsuitable brake fluid in your automobile can result in poor brake efficiency and even brake lockup. don’t

Ought to I swap to DOT 5 brake fluid?

Besides in extraordinarily uncommon circumstances, you shouldn’t swap to DOT 5 brake fluid. Additionally, as soon as you turn to DOT 5, you’ll be able to by no means return.

Even in case you apply the brakes a number of instances, you’ll by no means get the total DOT 5 out of the system. It doesn’t matter in case you drive a Harley Davidson or drive a Buick; When you shift, you’re caught except you substitute all your brake elements.

Additionally, you completely can’t swap to DOT 5 brake fluid in case your automobile has ABS brakes. Most newer autos have them, which implies they don’t seem to be suitable with DOT 5 brake fluid.

It is because DOT 5 brake fluid foams when pushed on and off repeatedly, which is exactly how ABS brakes work. As a substitute of coming to a fast cease, your brakes will go spongy, stopping you from coming to an entire cease.

Along with the added prices, DOT 5 brake fluid wants additional upkeep or else you’ll find yourself with comfortable brakes and rusted elements. Should you’re considering of creating the swap, don’t. But when your automobile already makes use of DOT 5, don’t swap again both. 


Each automobile ought to have a ample quantity of brake fluid. Whether or not you drive an financial system automobile, massive industrial truck, or bike, you’ll want brake fluid.

The primary perform of brake fluid is to regulate the motion of the important elements of the braking system. Brake fluid permits the pistons within the brake system to compress the rotors, which permits the automobile to decelerate.

As now we have seen on this article, there are various several types of brake fluid. It is very important know what kind of brake system you might be utilizing earlier than buying brake fluid. The brake fluid it is best to use is mostly the one really useful by the automobile producer.

It’s important that you just comply with the directions in your automobile’s proprietor’s guide. From DOT 3 to DOT 4, after which to DOT 5.1, you might have the choice to improve. They’re all glycol based mostly brake fluids.

However, DOT 5 brake fluid is a silicone-based product and shouldn’t be blended with different fluids. This brake fluid was primarily designed for navy autos.

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