Comma DOT 4 Brake Fluid 5L – Professional Braking Performance

Purpose and Specifications

Comma DOT 4 is a glycol-based brake fluid engineered for modern vehicles with advanced braking systems like ABS (anti-lock braking systems) and ESP (electronic stability control). This 5-liter container provides the current industry standard brake fluid trusted by most vehicle manufacturers.

Key Performance Benefits:

• Higher Boiling Point – Resists brake fade during heavy braking, stop-and-go traffic, and mountainous driving. Operates reliably at temperatures exceeding 500°F (260°C) under severe conditions.
• Moisture Resistance – Absorbs less water than DOT 3, reducing corrosion in brake lines, calipers, and master cylinders over time.
• System Compatibility – Works safely with DOT 3 fluid and other DOT 4 formulations. Ideal for drum and disc brake systems.
• Extended Component Life – Protects and conditions brake seals, minimizing wear and extending the lifespan of critical braking components.

When to Use / Replace?

Use Comma DOT 4 for all vehicles specifying DOT 4 brake fluid, particularly those with ABS or ESP technology. Replace brake fluid every 2 years or 40,000 km, whichever comes first. More frequent replacement is recommended for vehicles experiencing heavy braking use, towing, or mountainous terrain. Always follow your vehicle manufacturer's maintenance schedule.

Storage and Handling:

• Store in the original sealed container only to prevent water absorption.
• Keep container tightly closed when not in use.
• Avoid extreme temperatures during storage.
• Do not refill or reuse containers.
• If spilled on paintwork, wash immediately with water – do not rub.

Frequently Asked Questions

Q: Can I mix Comma DOT 4 with DOT 3 fluid?
A: Yes, DOT 4 is compatible with DOT 3 and can be safely mixed. However, mixing reduces the overall boiling point of the fluid, so a complete system flush is recommended for optimal performance.

Q: Why does my brake fluid need replacing if it looks clean?
A: All brake fluids absorb moisture from the air over time, even in sealed containers. This absorbed water lowers the boiling point and encourages corrosion inside brake lines and cylinders. Regular replacement prevents brake system failure and maintains safety.

Q: Is DOT 4 suitable for high-performance or racing applications?
A: DOT 4 is suitable for most driving conditions. For extreme racing or track use, consider DOT 5.1 (a higher-performance glycol-based fluid) for even greater heat resistance. Both are glycol-based and compatible if you decide to upgrade.