Purpose and Specifications

ATE DOT 4 Brake Fluid (03.9901-6432.2) is a premium glycol-based hydraulic fluid designed for reliable braking in cars, trucks, and motorcycles. This 1-liter can delivers a dry boiling point over 230°C (446°F) and wet boiling point above 155°C (311°F), preventing vapor lock and brake fade during intense stops. It protects metal parts from corrosion, maintains smooth pedal feel, and works with ABS/ESP systems for quick response even in cold weather down to -40°C.

• High heat resistance: Stays effective under heavy towing, mountain driving, or spirited street use.
• Corrosion protection: Buffered formula shields cast iron, steel, aluminum, and other components.
• Compatible: Mixes safely with DOT 3 or other DOT 4 fluids; ideal upgrade for better performance.
• Shelf life: Up to 5 years unopened; use within 2 years once opened.

When to Use / Replace?

Use ATE DOT 4 for vehicles with demanding brakes: European cars, performance models, or any needing higher heat tolerance than DOT 3. Replace every 2 years or 50,000 km (whichever comes first) since it absorbs moisture over time, lowering its boiling point and risking corrosion. Flush if brakes feel spongy, during pad changes, or after track days.

Pro tip: Bleed brakes fully for best results—keeps stopping power sharp and safe.

FAQ

Q: Can I mix this with DOT 3 fluid?
A: Yes, fully compatible for topping off, but flush and refill with DOT 4 for maximum heat protection.

Q: How often should I change it?
A: Every 2 years or 50,000 km in normal driving; yearly for towing or hot climates.

Q: Is it good for winter driving?
A: Absolutely—flows smoothly at -40°C, ensuring ABS works fast on icy roads.