DOT 3 and DOT 4 Synthetic Brake Fluid (BFLV)
 DOT 3 and DOT 4 Synthetic Brake Fluid (BFLV)

*** This item is available for US customers only ***

Brake fluid acts as a hydraulic fluid, transferring power and lubricating brake system components while also preventing corrosion. It must contend with extreme heat and the inevitable moisture contamination that can lead to a brake system failure. AMSOIL synthetic brake fluids surpass Department of Transportation (DOT) requirements and provide auto enthusiasts and racers with a brake fluid that delivers superior high-temperature performance.

Product Code: BFLV • Brand: AMSOIL

MSDS Data Sheet

Product Details Tech Data Reviews & Rating

Product Applications
Use AMSOIL DOT 3 & 4 Synthetic Brake Fluid in passenger car, light truck and powersports applications that require a DOT 3, 4 or 5.1 product. Do not mix with DOT 5 fluid. Refer to your owner's manual regarding the proper change interval for your brake fluid and to determine the correct DOT classification. Change fluid every two years for maximum performance.

Product Application Specs

• DOT 3
• DOT 4
• DOT 5.1

Note: Do not mix with DOT 5 fluid.

Product Description
Fights Water Contamination: Water contaminates the brake system by seeping through microscopic pores in fl exible brake lines and seals and through the reservoir fi ll cap. Brake fluid itself is hygroscopic (attracts moisture). Once introduced to the system, water reduces boiling points and compromises performance. It corrodes brake parts, lines and seals, leading to eventual failure. AMSOIL synthetic brake fluid's superior wet boiling points counteract these problems. They lubricate and protect intricate brake components despite the inevitable water contamination. A nitrogen blanket is added to each bottle during manufacturing to purge moisture and ensure the maximum level of performance.

Firm Pedal Feel
The extreme pressure and high heat common to brake systems can push brake fluid beyond its boiling point, causing it to vaporize or "boil-off." Water contamination can accelerate the process. This leads to a spongy or unresponsive feeling in the brake pedal (vapor lock). In contrast, the unique chemistry behind AMSOIL synthetic brake fluids increases boiling points well beyond DOT standards, even when contaminated with 3.7 percent water. AMSOIL Brake Fluids maintain a stable viscosity over a wide temperature range and flow easily at the high pressures generated in today's automotive brake systems to deliver solid, reliable braking. Maximum ABS and Traction-Control Performance AMSOIL DOT 3 & 4 Synthetic Brake Fluid's low-viscosity (817 cSt) provides superior cold-weather performance and excellent ABS and traction-control responsiveness. It covers a broad range of applications and exceeds DOT 3, 4 and 5.1 specifications.

Maximum ABS and Traction-Control Performance
AMSOIL DOT 3 & 4 Synthetic Brake Fluid’s low-viscosity (817 cSt) provides superior cold-weather performance and excellent ABS and traction-control responsiveness. It covers a broad range of applications and exceeds DOT 3, 4 and 5.1 specifications.

Brake Fluid Maintenance
Brake fluids fail either because they boil or because they cease to provide adequate lubrication and corrosion protection. Both reasons for failure are the result of contamination, usually by water or petroleum products.

DOT 3 and DOT 4 polyglycol ether-based brake fluids are hygroscopic, which means they absorb water easily and hold it in suspension, similar to antifreeze. In most climates, moisture seeps into the brake system continuously through the various seals and microscopic pores of the flexible brake lines. This seepage can accelerate as a vehicle ages and there’s almost no limit to how much water the fluid can absorb. By the time brake fluid has been in the system for three years, it can easily reach its wet boiling point. Because this happens gradually, most drivers won’t discover the reduced braking ability until it’s too late.

Many owner’s manuals recommend changing brake fluid every 24 months to remove moisture. Approximately half of all cars and light trucks in the U.S. over 10 years old have never had the brake fluid changed. In addition, powersports applications such as motorcycles, ATVs and UTVs require routine brake fluid changes as well.

This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL BFLV.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

Typical Technical Properties
AMSOIL DOT 3 and DOT 4 Synthetic Brake Fluid (BFLV)
DOT 5.1
Dry °C(°F)
Wet °C(°F)


Min 205 (401)
Min 140 (284)

Min 230 (446)
Min 155 (311)

Min 260 (500)
Min 180 (356)


Max 1500
Min 1.5

Max 1800
Min 1.5

Max 900
Min 1.5

* ERBP: Equilibrium Reflux Boiling Point.
* Dry ERBP: The boiling point of new, freshly opened brake fluid.
* Wet ERBP: The boiling point of brake fluid having absorbed 3.7 percent water.

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Product Name: DOT 3 and DOT 4 Synthetic Brake Fluid (BFLV)
Current Rating: 4.5 out of 5 stars
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