Purpose and Specifications

ATE DOT 4 Brake Fluid (03.9901-5803.2) is a premium 5-liter can of high-performance hydraulic fluid designed to deliver reliable braking power in cars, trucks, and motorcycles. This glycol-based fluid excels in high-heat conditions, resisting boil-off to prevent spongy pedals during hard stops, towing, or mountain driving. It flows smoothly at low temperatures down to -40°C for quick ABS response in winter, while staying stable up to 230°C dry boiling point to maintain firm braking under extreme heat.

Key practical benefits include superior corrosion protection for metal parts like cast iron and steel, excellent lubrication for brake components to reduce wear, and compatibility with DOT 3 systems for easy top-ups. The buffered formula fights acid buildup, extending system life, and its high thermal stability keeps performance strong over time.

When to Use / Replace?

Use ATE DOT 4 for daily drivers with ABS/ESP, performance vehicles, heavy towing, or hilly terrain where brakes heat up fast. It's ideal if your manual specifies DOT 4, offering better heat resistance than DOT 3 without compatibility issues.

• Replace every 2 years or 40,000 km - Brake fluid absorbs moisture over time, dropping its boiling point and risking corrosion or fade.
• Flush immediately if pedal feels soft - Sign of water contamination or air in lines.
• Shelf life: 3-5 years unopened - Store sealed in cool, dry place; mark open date and use within 1 year.

FAQ

Can I mix ATE DOT 4 with DOT 3 fluid?
Yes, it's fully compatible and safe to top up DOT 3 systems, boosting heat protection instantly.

Is this fluid good for cold weather?
Absolutely - low viscosity at -40°C ensures fast, responsive braking even in freezing conditions with ABS.

How much for a full brake flush?
A 5-liter can covers most cars and trucks; typical flush uses 1-2 liters depending on system size.