Top 10 Best Brake Fluids [2021]
Brake fluid is one of the most important safety components of any car, for this reason, it is essential to perform good maintenance and know-how often it needs to be changed or serviced so that the car always has good braking capacity. Builders’ recommendations state that brake fluid should be changed every two years, and since it’s very easy to replace, you can do it yourself at home.
What is Brake Fluid?
Brake fluid is a hydraulic oil used in hydraulic brakes and hydraulic clutches of automobiles, motorcycles, light trucks, and certain bicycles. It is used to transmit pressure and increase braking force. This is effective because the liquid is not visible. Most brake fluids used today are based on glycol-ether, but mineral oil (Citroën/Rolls-Royce LHM) and silicone oil (DOT 5) can also be used.
In this article, we will analyze some of the best brake fluids on the market, such as the Brembo L 04 005, which offers you the confidence of the leading brand in brakes on the market, or the Repsol RP701B96, a high-performance product with good stability.
How does brake fluid work?
If you were wondering how brake fluid works, here is a simplified step-by-step guide on how brake fluid works in a brake system.
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Best
Value
Brembo L04010
4.71,515 reviews
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Editors
Choice
Bosch ESI6-32N
4.81,622 reviews
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Castrol 12509 Dot 4
4.71,609 reviews
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Motul MTL100949
4.91,264 reviews
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LUCAS OIL 10827 Multi 12 ounce Brake Fluid
4.8584 reviews
| Brembo L04010 | Bosch ESI6-32N | Castrol 12509 Dot 4 | Motul MTL100949 | LUCAS OIL 10827 Multi 12 ounce Brake Fluid |
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Editors |
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4.7
1,515 reviews |
4.8
1,622 reviews |
4.7
1,609 reviews |
4.9
1,264 reviews |
4.8
584 reviews |
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Top 10 Best Brake Fluids in the market today
Brembo L04010
Check the current price-
PROS
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Prevents vapor lock
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High viscosity allows the oil to spread well
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It is a DOT 4 type brake fluid so it has very high compatibility and can be used in many models of cars and motorcycles.
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CONS
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The container does not have a dispenser, so care must be taken when pouring the liquid, as the spout is large and can be poured out.
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1,515 reviews
The Brembo L04010 brake fluid could be the best brake fluid at the moment, since it has a higher boiling point than other cheaper fluids, which together with its lower viscosity index causes it to spread better and cover all parts, facilitating braking and improving driving safety.
Thanks to the higher boiling point, it prevents vapor lock and offers efficient braking under all conditions. The liquid offers anti-corrosive properties and resists oxidation, so it can remain unaltered for a long time, lengthening the time between changes.
Brembo could be the best brand of brake fluid, due to its long experience as a manufacturer of safety parts for vehicles, especially brakes. This dot 4 brake fluid is suitable for any vehicle with ABS-type brakes.
Bosch ESI6-32N
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PROS
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Compatible: It is compatible with other brake fluids, saving you time since it is not necessary to drain the entire system.
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Bosch brake fluid has a superior resistance, providing a prolonged maintenance frequency every 3 years or 60,000 km.
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CONS
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Since it’s Bosch, it’s a bit expensive compared to its competitors.
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1,622 reviews
Bosch ESI6-32N brake fluid is made from synthetic materials for the best heat resistance. Thanks to this formulation, it prevents the formation of bubbles or vapor locks that can cause braking problems. In addition, as it is a DOT 3, 4, and 5.1 oil, it is compatible with newer vehicles with ABS and ESP.
This could be one of the best brake fluids of 2021, as Bosch has been working for several years to offer a durable product, capable of withstanding up to 60,000 km in good condition and without showing signs of corrosion.
It has all the certifications of the OEM standards for cars of the Volkswagen group (Seat, Audi, Skoda, and Volkswagen), PSA, Ford, and BMW. Due to its formulation, it is compatible with other brake fluids, so complete drainage of the system will not be necessary.
Castrol 12509 Dot 4
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PROS
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Performance: It is a liquid formulated for high-performance or competition vehicles, whose parts are subjected to extreme operating conditions, so it is very resistant.
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Protection: This fluid ensures the highest level of protection for the brake system, prevents corrosion and evaporation of the fluid, avoiding the formation of bubbles.
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Requirements: Meets all required standards for high-performance vehicles.
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CONS
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Price: As it is a high-end brake fluid, designed for competition teams, its price is higher than other fluids on the list.
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1,609 reviews
Castrol 12509 motorcycle brake fluid is synthetically formulated to offer maximum performance to motorcycle braking systems. Castrol might just be the best brake fluid brand, thanks to its expertise in manufacturing lubricants and fluids for high-performance sports vehicles.
This brake fluid maintains braking efficiency for longer, thanks to its synthetic formula without minerals that “burn” and dirt the fluid. It has a higher boiling point, which far exceeds the SAE J1730, SAE J1704, FMVSS 116 DOT 4, ISO 4925, and Jis K 2233 specifications. It is a liquid for high-performance and competition vehicles.
It is manufactured with a mixture of polyethylene glycol ethers and borate ethers, together with other high-performance heat-inhibiting additives, offering extraordinary protection to the entire braking system and protecting parts from corrosion.
Motul MTL100949
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PROS
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Formulation: Despite being a synthetic oil, its silicone-free formulation is less polluting.
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Compatibility: It is a liquid compatible with motorcycles and cars, as well as for use in clutches, so it can be very useful in many circumstances.
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Protection: It has a boiling point of 328ºC much higher than that of most liquids, so it is a high-performance product.
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CONS
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Quantity: For a high capacity brake fluid and for its price, the bottle could be a bit larger, since 0.5L is made a bit short.
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1,264 reviews
Motul RBF 600 racing brake fluid is perfect for all DOT 4-compliant vehicles. It is a fluid that can also act as a clutch fluid and has a silicone-free formulation, which prevents the formation of dirt inside and out. prevents the liquid from “browning”.
It has been designed to withstand extreme temperatures generated by competition brakes, especially those made of ceramic or carbon. Although it is also ideal for conventional steel disc braking systems and for daily use. Thanks to its high boiling point, above 320 ºC, it prevents the formation of vapors and bubbles, which is why it has a longer useful life than other liquids.
Motul fluid exceeds all the requirements of DOT 3, DOT 4, and DOT 5.1 standards, allowing effective braking, even in the most extreme conditions.
LUCAS OIL 10827 Multi 12 ounce Brake Fluid
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PROS
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Prevents rust and corrosion of drums and discs
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Prevents seal hardening or softening.
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Compatible with all brake system rubber components
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CONS
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May not be a good replacement for DOT3 and DOT5
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584 reviews
Lucas DOT 4 brake fluid is a premium blend of polyethylene glycol-ether and additives that can reach or exceed the industry’s lowest boiling point of 446 degrees Fahrenheit. Comply with Federal Vehicle Safety Standard (FMVSS) 116 and SAE J1704.
It is recommended to use Lucas DOT 4 brake fluid for disc and drum brakes and clutch systems that require this oil. Lucas DOT 4 brake fluid is compatible with all rubber brake components and other brake fluids. Harden or soften. Prevent rust and corrosion, and have excellent lubricity. Comes in a 12-ounce bottle.
Prestone Synthetic Brake Fluid AS800Y
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PROS
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Provides corrosion protection for all metals within the braking system
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Compatible with all conventional brake fluids
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Substantially reduces the possibility of fluid vaporization and eventual brake failure
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Excellent performance in high-temperature braking systems
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CONS
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Has lower viscosity than its top closest competitors
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618 reviews
Prestone brake fluid provides high boiling point protection. The mixture of polyethylene glycol can ensure that no dangerous fumes are generated when the thermal brake system is used.
When needed, by avoiding sponge pedals, the braking force can be provided. The score exceeds the state minimum standard. The complete inhibitor package provides corrosion protection for all metals in the brake system. It is recommended for all disc and drum brake systems and all hydraulic clutches that require DOT-3 and DOT-4 fluids.
When maintaining a high wet boiling point, liquid evaporation and possible brake failure (due to the vapor barrier) may occur, the lowest dry boiling point: 266 degrees Celsius (510 degrees Fahrenheit), the lowest wet boiling point: 155 degrees Celsius (311 degrees Fahrenheit) meets or exceeds. The DOT-3 and DOT-4 specifications have been added. Compatible with all common brake fluids. Complies with Federal Vehicle Safety Standard 116. Complies with SAE J1703 and J1704.
Castrol 12614 OIL
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PROS
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Provides optimum braking response
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Exceeds dot3 and dot4 specifications
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Mixes with other conventional brake fluids
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CONS
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As it is high-performance brake fluid, it is priced somewhat higher than other products for daily use.
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294 reviews
Castrol 12614 brake fluid is suitable for most vehicles compatible with DOT 4 type fluids, whether they are cars, motorcycles, or vans. In addition, thanks to its synthetic formulation it can also be used to replace the clutch fluid, as long as they are vehicles with hydraulic systems.
It is a totally synthetic product, so it offers the best performance, with very high resistance to the extreme temperatures that form inside the brake system. This prevents foam and bubble formation, which can cause poor braking.
In addition, being designed for competition and high-performance vehicles, it prevents corrosion and protects the entire braking system, improves the useful life of the oil and also of the brakes. Meets all FMVSS 116 DOT 4, ISO 4925 class 4, and SAE J1703 and J1704 specifications.
Finish Line High Performance
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PROS
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Specifically engineered for use in bicycle hydraulic disc brakes
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Prevents foaming and overheating
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A high-Performance DOT 5.1 Brake Fluid Oil for Bicycle
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CONS
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Cannot be used in automotive vehicles
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682 reviews
The focus of the Finish Line was small batch production, product development, and quality control. It quickly became a priority for creating a brand identity and expanding the category of bicycle care products. In 1990, Finish Line realized the international potential of its bicycle lubricants. The company began exporting to Germany and the UK. The company soon participated in bicycle trade shows in Europe and Asia, and these efforts contributed to further global expansion.
In the past few years, Finish Line has focused on instructing riders on how to choose and use the most suitable lubricants, cleaners, and cleaning tools for their bicycles, riding conditions, and how to maintain their bicycles by themselves.
Finish Line now is one of the major producers of high performance brake fluids and is one of the most popular brake fluid brands.
Maxima Racing USA 80-86916
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PROS
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High-performance brake and clutch fluid
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Anti-vapor lock formulation
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Advanced chemistry resists corrosion
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CONS
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Not applicable replacement for DOT3 and DOT5.1
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92 reviews
The Maxima racing brake fluid and clutch oil lubricate and protect key brake system components while providing reliable braking power. The anti-vapor barrier formula can ensure responsiveness and performance by fighting pollutants and water evaporation.
Exceeding American FMVSS 116 DOT 3 and DOT 4, SAE J1703, SAE J1704 and ISO 4925 (class 3 and 4) with excellent boiling points: dry boiling point 243°C (469°F), wet boiling point 318°F (159°C).
Endless Racing Brake Fluid
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PROS
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Used in Formula 1, WRC, and Dakar Rally
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Ability to maintain dry boiling point
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Becoming recognized as the highest-spec brake fluid around the world
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CONS
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This high-performance brake fluid also comes with a high price tag
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38 reviews
The Endless Racing RF-650 ring brake fluid is used in Formula One, WRC, and Dakar Rally, but it is still available to end-users who are looking for high-performance brake fluid. RF-650, like F1, performs equally well on streetcars. Very consistent performance can be achieved on tracks where the braking temperature reaches extremely high temperatures that cannot be found outdoors.
The fluid’s volatility and uniform viscosity react very quickly in the brake system. Regardless of the temperature, it is accurate. The low freezing point (-40°C) also makes RF-650 ideal for snow gatherings. RF-650 is recognized as the most powerful brake fluid.
Brake Fluid Buying Guide
After our comparison of brake fluids in which we have analyzed the best products in detail, we are going to move on to the buying guide, in which we will explain which are the most important points you should pay attention to before you buy brake fluid for your vehicle.
We start this buying brake fluid guide with one of the most important points and that is that not all fluids on the market are the same. It is very important to use only the type of liquid indicated by the manufacturer. To find out what it is, the best thing you can do is consult the manual or ask directly at your trusted workshop.
Today, many cars circulate with the fluid in poor condition or use a fluid that is not correct, which can cause accidents and braking problems.
In the market we can find DOT 3 type liquids, which is the most conventional liquid, they have a dry boiling point of 205 ºC and in wet brake fluid conditions of 140 ºC, so they have relatively low points, which leads to the formation of foams. and bubbles. Its viscosity is usually around 1500 CST (viscosity units) and it is a common and inexpensive liquid, although practically in disuse.
Types of Brake Fluids
DOT 4 is the most widely used in ABS-type brake systems so it is the most common fluid today and the one that all cars usually carry when they leave the dealership. It has a dry boiling point of 230 ° C and a wet brake fluid boiling point of 155 ° C, although some high-performance DOT 4s exceed these numbers. Its viscosity is 1800 CST and offers greater durability than DOT 3, so it can be changed every 60,000 km or 3 years, although it is not recommended.
DOT 5 type brake fluid is the most widely used in American cars, it is a product whose synthetic-based formulation does not use minerals, so it produces less waste and pollutes less. This liquid should never be mixed with DOT 3 and DOT 4 liquids since they do contain mineral elements in their formulation. Due to its synthetic base, it is very resistant, with boiling points above 260 ºC.
Finally, we find the DOT 5.1 type liquids. Contrary to what it may seem, it is not an evolution of 5.1, but it is a completely different liquid, with a mineral base. It has a dry boiling point of 270 ºC and a wet boiling point of 180 ºC, with a viscosity much lower than that of other liquids, 900 CST. The main advantage of this liquid is that it has higher hygroscopic power than that of DOT 3 and DOT 4, which means that it absorbs moisture better, protecting the liquid for a longer time.
Boiling Point
The boiling point is another very important factor to look at when choosing brake fluid and it will have some impact on how much the product itself costs.
This characteristic is decisive to avoid the maximum temperature effort since when it exceeds this point, the liquid begins to boil, and vapor bubbles form, causing it to stop being stable and causing a vapor lock that prevents the car from braking correctly. When this happens, the pressure point of the pedal varies and can even get lost with a disastrous result.
Brake fluids have two boiling points: dry and wet. The first is the boiling point of the new and sealed liquid, and it is usually around 240 for an inexpensive liquid or 300 ºC for competitive ones. The second is the boiling point of the liquid when it contains 3.5% water, something common due to condensation and possible leaks that cause water to enter the tank.
Formulation
Brake fluids usually have two basic formulations to choose from: glycol-based or silicone-based. Glycol-based liquids have a better hygroscopic factor, meaning that they bind and absorb water. Those based on silicones do not have this positive property and, therefore, tend to have a lower performance.
Viscosity
Viscosity is the factor in charge of ensuring the functions of the braking system. The use of modern ESP brake and ride stabilization systems requires high modulation speed and brake pressure.
For this reason, the best brake fluids have a particularly low viscosity, which is the prerequisite for reliable control and instant braking. Using a fluid with the wrong viscosity can have fatal consequences on brake performance.
Frequently Asked Questions
How to change the brake fluid?
The process of changing the vehicle’s brake fluid is somewhat more complex than changing other fluids, such as oil. The main cause is that we must not only change the liquid but also purge the system so that everything works correctly. We will start by parking the vehicle in a flat area. We open the hood and look for the liquid reservoir, which we will empty using a syringe or aspirator. Next, we add the new liquid, taking as little time as possible in the process to reduce the presence of air.
The next step is to bleed the brakes. To do this, we will remove the wheels, one at a time, and starting from the rear left. Then we will continue with the rear right, front left, and front right. This order is important and must be respected. Each brake caliper includes a bleeder in the cylinder, which we must open and connect a rubber hose to collect the old fluid.
To bleed, you must need the help of another person, who will step on the brake several times to “load” the system and then step on it all the way, previously opening the bleeder. It collects the excess liquid and, once the pedal is fully engaged, the bleeder is closed. At the end of the process, we must check the liquid level and add more if necessary. We will repeat the process with each brake until all four are completed, finally checking the level. Do not forget to check that the vehicle brakes correctly before starting to circulate.
When to change brake fluid?
As with oils and other engine fluids, the maintenance interval appears in the manual of our vehicle, this being the main reference in this regard. If you do not have the manual at hand, in general, a maintenance period of about 30,000 to 40,000 kilometers is established. Since it is an economic and vital operation for our safety, it does not hurt to execute it with an adequate frequency.
What happens if I run out of brake fluid?
Since the vehicle’s braking system is hydraulic, what we will notice at the moment is that, when pressing the pedal, it will go to the bottom without any effort, since that lack of fluid eliminates the resistance of the pedal itself. Obviously, the brakes will not work either, since there is no internal pressure in the system, they will not activate and you will not be able to stop the vehicle normally. In this case, you will need to use the gearbox to slow down the vehicle, using the parking brake when the speed is slow enough to stop safely.
Where do you put the brake fluid?
The brake fluid is poured into a reservoir located inside the engine compartment and duly labeled as such. Its size is small, similar to that of a small bottle, so you will have to refine your view. If you cannot find it, you can always refer to the user manual, where its specific location is indicated.
What color is the new brake fluid?
The new brake fluid is clear and has a golden yellow hue. As it is used, it takes on a darker color to the point of turning black if it is of considerable age. This color is just one of the useful references to know if it is time to change it.
Final Words
Brake fluids help lubricate and keep the brake system-protected, it is part of maintaining it. The more current the fluid is and is changed in the recommended intervals, the car’s brakes will last longer.
Good brake fluid will decrease the chances of car accidents. It could also protect the mechanics of the brake system and prevent corrosion of the surface of the parts.
