AMSOIL Synthetic Brake Fluid is the best brake fluid for passenger cars, light trucks, motorcycles, and Powersports applications that require a DOT 3, 4, or 5.1 product. AMSOIL DOT 3 & 4 Brake Fluid maintains maximum ABS and traction-control performance. 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 brake fluids surpass Department of Transportation (DOT) requirements and provide racers with a brake fluid that delivers superior high-temperature performance preventing brake fade and vapor lock.

AMSOIL Synthetic Brake Fluid Fights Water Contamination

Water contaminates the brake system by seeping through microscopic pores in flexible brake lines and seals and through the reservoir fill cap. The 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 DOT 3, DOT 4 & DOMINATOR® DOT 4 Brake Fluid's superior wet boiling points counteract these problems. It lubricates and protects 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 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. A nitrogen blanket is added to each bottle during manufacturing to purge moisture and ensure the maximum level of performance.

Ultra-High Boiling Points

AMSOIL DOMINATOR® DOT 4 Racing Brake Fluid features ultra-high boiling-points of °F (wet) and 580°F (dry). It maintains a low compressibility during the most extreme racing conditions.