Have You Checked Your Brake Fluid Lately? 🚗

[Maintenance Series]
By Honda Magazine | Published: November 5, 2024

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The Importance of Brake Fluid

Private car ownership has become ubiquitous in urban China. But with so many cars on the road, what’s the most critical feature of your vehicle? Is it the design, performance, comfort, practicality, or safety? For us, safety tops the list.

Brake systems are vital for safety, and one component often overlooked is brake fluid—the unsung hero transmitting your braking force. Let’s dive into why it’s essential to maintain and replace it regularly.

How Brake Fluid Works

Brake fluid operates within a sealed hydraulic system. When you press the brake pedal, it activates a rod that pushes fluid through the brake master cylinder, transmitting force to the calipers or drum brakes.

🚨 Why It’s Critical:

• Brake fluid transfers force efficiently because liquids are incompressible.
• Any air or moisture in the system reduces its effectiveness, leading to "soft brakes."
• Over time, heat and water absorption degrade its performance.

Why Replace Brake Fluid?

🔧 Heat and Moisture Are the Culprits
When braking, heat generated by friction is partially transferred to the fluid. Excessive heat lowers the fluid’s boiling point, creating vapor bubbles that compromise braking power.

Additionally, the system isn’t 100% airtight, and moisture from the air can contaminate the fluid, further reducing its boiling point.

When to Replace Brake Fluid

🕒 Replace every 2 years or 60,000 km (whichever comes first).
🛠️ Use a brake fluid tester pen to check for water content. If it exceeds 4%, it’s time for a replacement.

Choosing the Right Brake Fluid

Brake fluids are graded by the DOT system:

• DOT4: Common for everyday vehicles; good dry and wet boiling points.
• DOT5.1: Higher performance, suitable for aggressive driving or racing.

💡 Examples of High-Performance Fluids:

• Endless RF-650: Dry boiling point 323°C, wet 210°C.
• ATE DOT4: Dry 280°C, wet 198°C.
• AP Racing DOT5.1: Dry 269°C, wet 180°C.

Maintaining Brake Fluid

Regular maintenance is key:

• Flush the system every 1–2 years to remove contaminants.
• If you notice spongy brakes or decreased stopping power, consult a professional.