Purpose and Specifications

ATE DOT 5.1 Brake Fluid (03.9901-6611.2) is a premium glycol-based hydraulic fluid in a convenient 20-liter can, perfect for professional workshops and high-volume brake system maintenance. This high-performance fluid delivers rock-solid braking by resisting heat buildup, preventing vapor lock, and ensuring smooth pedal feel even in extreme conditions.

Key practical benefits include:

• High heat resistance: Stays effective up to 260°C dry and 180°C wet, stopping brake fade during hard stops, track days, or heavy towing.
• Cold weather reliability: Flows smoothly at -40°C for quick ABS response and crisp braking in freezing temps.
• Longer component life: Built-in corrosion inhibitors protect seals, calipers, and lines from rust and wear.
• Compatible and safe: Mixes fully with DOT 3/4 fluids; never mix with silicone DOT 5.

Ideal for modern vehicles with advanced ABS/ESP systems and high-performance braking setups from brands like Hawk, EBC, and Pagid.

When to Use / Replace?

Use ATE DOT 5.1 for demanding driving like spirited road use, mountain descents, or racing where standard fluids fail. Upgrade from DOT 4 for superior heat handling without compatibility issues.

Replace every 2 years or 40,000 km (whichever comes first), as it absorbs moisture over time, dropping performance and risking corrosion. Shelf life is 3-5 years unopened; date and use opened fluid within 1 year. Always bleed the system fully for best results.

FAQ

Can I mix this with my current DOT 4 brake fluid?
Yes, fully compatible since both are glycol-based. But for peak performance, flush and replace completely to maintain high boiling points.

Is DOT 5.1 better for winter driving?
Absolutely - its low viscosity at -40°C ensures fast ABS action and no spongy pedals in cold weather.

How much fluid for a full brake flush?
Typically 1-2 liters for most cars; this 20L can handles multiple vehicles or bulk storage.