What Is Honda DOT 4 Brake Fluid?

Honda DOT 4 Brake Fluid is a hydraulic fluid used in braking systems that specify the DOT 4 standard. Brake fluid transfers pressure from the brake pedal through the hydraulic system to help operate the brakes. Maintaining the correct fluid specification is essential for proper braking-system operation.

Honda Ultra BF DOT 4 is listed as a Honda brake fluid product. The automotive 500 mL version is sold under part number 08203-99938. Always compare the number on the actual bottle with the product details before ordering.

Specifications

Key Features

• DOT 4 grade: For brake systems specifying DOT 4 fluid.
• Hydraulic pressure transfer: Helps transfer braking force through the hydraulic system.
• Honda fluid option: A Honda-branded brake fluid for compatible applications.
• Maintenance use: Suitable for brake-fluid replacement when DOT 4 is specified.
• Vehicle-specific compatibility: Confirm the required fluid grade before purchase and use.
• Convenient packaging: Listed in a 500 mL bottle; verify the size printed on your stock.

Vehicle Compatibility

Honda DOT 4 Brake Fluid may be used in vehicles whose manufacturer specifies DOT 4 brake fluid. Some Honda models specify DOT 3 or DOT 4, while others may have different requirements depending on the model, year and market.

Do not assume that every Honda vehicle requires DOT 4. Check the owner’s manual or service information for your specific vehicle before ordering. The fluid specification, not just the vehicle brand, determines suitability.

Why Is the Correct Brake Fluid Important?

Brake fluid is a critical part of a vehicle’s hydraulic braking system. Using the specified fluid helps the system operate within its intended requirements. The wrong fluid can affect braking-system components and may compromise safe operation.

Never use DOT 5 fluid unless the vehicle manufacturer explicitly specifies it. DOT 5 is not interchangeable with DOT 3 or DOT 4 in systems that prohibit it. Do not mix fluids casually; follow the vehicle manufacturer’s instructions when topping up or replacing brake fluid.

When Should Brake Fluid Be Replaced?

Replace brake fluid according to the maintenance schedule for your vehicle. Brake fluid can absorb moisture over time, which can affect its performance. If the fluid level is low, have the system checked for leaks or worn components instead of simply topping it up without investigating the cause.

Usage and Storage

Use fresh fluid from a sealed container and keep the cap tightly closed after opening. Avoid contaminating the fluid with dirt, water or other liquids. Brake fluid can damage painted surfaces, so clean spills promptly according to the product instructions. If the wrong fluid has been added, seek professional advice before driving.

Compatibility Summary

For vehicles that specify DOT 4 brake fluid. Confirm the required grade in the owner’s manual before purchase.