Purpose and Specifications

ATE DOT 5.1 Brake Fluid (03.9901-6603.2) is a premium 5-liter can of high-performance glycol-based fluid designed for reliable braking in demanding conditions. It delivers a minimum dry boiling point of 260°C to prevent brake fade during intense stops and a wet boiling point of 180°C even after absorbing moisture, ensuring consistent power on long drives or tracks.

This fluid flows smoothly at low temperatures down to -40°C for quick ABS response in winter, protects against corrosion to extend caliper and master cylinder life, and is fully compatible with rubber seals in modern systems. Ideal for high-performance vehicles, it outperforms standard DOT 4 with better heat resistance without the incompatibility issues of silicone DOT 5.

When to Use / Replace?

Use ATE DOT 5.1 for track days, towing heavy loads, mountain descents, or any setup prone to heat buildup where standard fluid fails. Replace every 2 years or 50,000 km, as it absorbs moisture over time, lowering performance and risking corrosion. Shelf life is up to 5 years unopened; always flush the system completely for best results.

Key Practical Benefits:

• Stays effective up to 260°C dry / 180°C wet to avoid spongy brakes.
• Quick operation in cold down to -40°C for safe winter stops.
• Mixes safely with DOT 3/4 but upgrade fully for peak performance.
• Corrosion inhibitors keep your braking system lasting longer.

Frequently Asked Questions

Can I mix ATE DOT 5.1 with DOT 4? Yes, both are glycol-based and compatible, but for maximum heat protection, flush and replace with fresh DOT 5.1.

Is DOT 5.1 better than DOT 4 for daily driving? It's excellent for everyday use with superior heat resistance, especially if you tow or drive aggressively, but check your owner's manual.

How do I know when to change my brake fluid? Every 2 years or 50,000 km; test boiling point or look for darkened fluid indicating moisture buildup.