Features One of the Highest Brake Fluid Boiling Points Available in the Industry for Best Performance
Hygroscopic – Keeps Water in Brake Fluid in Suspension
AMSOIL Synthetic High-Performance DOT 3 and DOT 4 Brake Fluids (Product Codes: BF3, BF4) use pure base stocks and robust additives to combat boil-off and the effects of water contamination more effectively than conventional brake fluids. These polyglycol ether-based brake fluids are hygroscopic, meaning they absorb water easily and hold it in suspension, slowing its effects on the brake system. Formulated with the very best zinc-based anti-corrosion additives and pH stabilizers, AMSOIL Synthetic Brake Fluids are designed for high-temperature stability, yet flow easily at low temperatures. They remain virtually incompressible, even at the highest pressures generated in braking systems.
AMSOIL Synthetic Brake Fluids supply superior stopping ability under the most demanding conditions, even with varying temperatures. The lower boiling points and minimum additives found in less expensive brake fluids will begin to vaporize at a much earlier rate. This causes the brake pedal to travel further to apply the same amount of force on the brakes. The driver will experience the feeling of spongy brakes at first, then possibly a total fade or no brakes at all. With one of the highest boiling points in the industry, well above DOT minimum standards, AMSOIL Synthetic Brake Fluids offers best performance, ensuring maximum life and reliable braking power, even in extreme conditions.
AMSOIL Synthetic High-Performance DOT 3 and DOT 4 Brake Fluids provide superior high-temperature performance in car, light truck, high-performance, racing, motorcycle, ATV and other power sports applications. They exceed Federal Motor Vehicle Safety Standard #116 and all requirements of the Department of Transportation (DOT).
- Exceeds government standards for brake fluid boiling points
- Features high wet boiling points for maximum life, best performance and reliable braking
- Hygroscopic – keeps water in suspension, slowing its effects on the brake system
- Designed for high-temperature stability, yet flows easily at low temperatures
- Flows easily at the highest pressures generated in automotive brake systems
- Formulated with the best zinc-based anti-corrosion additives and pH stabilizers to provide good lubrication throughout the system
AMSOIL Series 500 Synthetic High-Performance DOT 3 Brake Fluid Product Code Pkg/Size BF3SN-EA 12-Ounce Bottle BF3SN-CA 12-Ounce Bottles (case of 12) AMSOIL Series 600 Synthetic High-Performance Racing DOT 4 Brake Fluid Product Code Pkg/Size BF4SN-EA 12-Ounce Bottle BF4SN-CA 12-Ounce Bottles (case of 12)
What is Brake Fluid?
Brake fluid is a type of hydraulic fluid. It is used to transfer force under pressure from where it is created through hydraulic lines to the braking mechanism near the wheels. Braking applications produce a lot of heat, so brake fluid must have a high boiling point to remain effective and must also not freeze under normal temperatures.
Cause of Brake Fluid Failure
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.
Water contaminates the brake system by seeping through microscopic pores in flexible brake lines and seals and through the reservoir fill cap when opened. Once inside, it quickly works to corrode brake parts, lines and seals, leading to eventual system failure. Water seepage can accelerate as a vehicle ages and there’s no limit to how much water brake fluid can absorb.
Water lowers the boiling point of brake fluid, which will eventually lead to failure. After two years of service, the average boiling point of brake fluid will have dropped below the minimum federal requirements. Because this happens gradually, most drivers won’t discover the reduced braking ability until it’s too late.
Water in Brake Fluid Lowers the Boiling Point
Brake Fluid Boiling Points Determine Protection and Reliability
The extreme pressure and high heat common to braking can push conventional brake fluids beyond their boiling points, causing them to vaporize, or boil off. The brake pedal must travel further to apply the same amount of force on the brakes, causing spongy brakes. If enough of the brake fluid vaporizes, brake system failure may occur.
Even more problematic, water contamination can drop the boiling point of conventional fluids below safe standards, accelerating the rate at which they boil off. Brake fluid boiling points are measured on two separate equilibrium reflux boiling point (ERBP) scales:
- Dry ERBP – the boiling point of new, freshly-opened, unused fluid
- Wet ERBP – the boiling point of a brake fluid after it has absorbed three percent water
The Department of Transportation (DOT) has set minimum standard requirements (shown in the charts below) to ensure brake fluids will provide adequate protection.
AMSOIL DOT 3 and DOT 4 Brake Fluids Far Exceed DOT Minimum Standard Boiling Points
AMSOIL Synthetic High-Performance DOT 3 and DOT 4 Brake Fluids are polyglycol ether-based fluids. They are hygroscopic, meaning they absorb water easily and hold it in suspension, slowing its corroding effects on the brake system. The unique chemistry behind AMSOIL Brake Fluids increase their boiling point temperatures well above Department of Transportation (DOT) minimum standards even when contaminated with 3.7 percent water, as shown in the charts below.
Note: Because brake fluids are hygroscopic, the wet boiling point is of much greater concern than the dry boiling point.
AMSOIL Synthetic High-Performance DOT 3 and DOT 4 Brake Fluids have one of the industry’s highest boiling points available. Their superior formulation lubricates and protects intricate braking components despite the inevitable water absorption associated with braking systems, delivering longer-lasting performance compared to conventional fluids, even in extreme conditions. AMSOIL Synthetic Brake Fluids maintain a stable viscosity over a wide temperature range. They are designed for high-temperature stability and flow easily at low temperatures.
Superior Additive Package
Brake fluids must protect the metals used in braking systems, such as calipers and master cylinders, from corrosion as moisture enters the system. AMSOIL Synthetic High-Performance DOT 3 and DOT 4 Brake Fluids are formulated with the best zinc-based anti-corrosion additives and pH stabilizers to provide good lubrication through the system.
Non-Compressible Even at High Pressures
When a fluid is non-compressible it means it won’t compress into a smaller volume when pressure is applied. In a brake system, fluid pressure is multiplied by the master cylinder and can reach more than 1,000 pounds per square inch (psi) in the lines. Like any other hydraulic fluid, brake fluid must be non-compressible at the expected pressures to transmit force from one end of the system to the other while simultaneously lubricating the pistons and rubber parts as they move through their bores. If the fluid were to compress, all braking power would be lost. AMSOIL Synthetic High-Perfomrance DOT 3 and DOT 4 Brake Fluids remain non-compressible, even at the highest pressures generated in today’s automotive brake systems to deliver consistent, safe braking.
Ideal Brake Fluid for Racing, Heavy Hauling, Motorcycles and ATVs
The aggressive driving conditions and sudden stops common to some on- and off-road motorcycle and ATV applications can literally boil conventional brake fluid, leaving behind a discolored, dirty solution that can promote deposit formation and corrosion on braking components. Worn brake fluid also fails to deliver adequate protection against water ingress common to powersports equipment exposed to the elements.
The synthetic base stocks and superior additives in AMSOIL Synthetic High-Performance Brake Fluids excel in demanding powersports applications, providing reliable brake lever and pedal response, corrosion protection and longevity as compared to conventional brake fluids. AMSOIL Series 600 DOT 4 Synthetic Racing Brake Fluid features a wet equilibrium reflux boiling point (Wet ERBP) nearly 100°F higher than the DOT minimum, making it the ideal choice for high-performance cars, racing, motorcycles and vehicles used for towing.
How Often Should You Change Brake Fluid?
Brake fluid is vital to safe driving, yet one of the most neglected fluids in vehicles today. Once installed, moisture seeps into the fluid through brake lines and seals, therefore the fluid will need to be replaced when the water content becomes too high. Also, the brake fluid’s corrosion inhibitors degrade over time and need to be replaced.
Experts recommend changing brake fluid every 12 to 24 months as preventative maintenance, even more often in wet and extremely humid climates. Many owner’s manuals recommend changing brake fluid every 24 months to remove moisture, ensuring reliability and safety. Many European countries require regular brake fluid inspections – half of all cars fail.
In the United States, half of all cars and light trucks that are 10 or more years old have never had their brake fluid changed. In addition, power sports applications such as motorcycles, ATVs and utility vehicles (UTVs) require routine brake fluid changes as well. After only a year of service, brake fluid in the average vehicle may contain as much as two percent water, and up to three percent after 18 months. After several years of service, it is not unusual to find brake fluid contaminated by seven to eight percent water.
Unlike other hydraulic fluids, brake fluid does not flow throughout the system. Brake fluid simply moves slightly back and forth for most of its life, leaving no opportunity to circulate through a heat exchanger of filter. Because it can’t be filtered, brake fluid must hold contaminants in suspension to prevent corrosion and clogging of small passages.
It is recommended that you change brake fluid on a regular basis to remove accumulated water and other contaminants, preserving the life of brake system components and increasing the performance and reliability of the brake system.
For application information on AMSOIL Synthetic High-Performance DOT 3 and DOT 4 Brake Fluids (BF3, BF4), consult the AMSOIL Online Product Application Guide. For power sports applications, consult the owner’s manual to determine the correct DOT classification.
AMSOIL Series 500 High-Performance DOT 3 Brake Fluid and Series 600 High-Performance Racing DOT 4 Brake Fluid both exceed Federal Motor Vehicle Safety Standard #116 and all requirements of the Department of Transportation (DOT).
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