FAQ: Brake Fluids

Brake fluid tends to soak up water, significantly lowering its boiling point. Just a 5% water content can halve its boiling temperature, leading to a severe loss of braking power during high-heat scenarios.

When brake fluid levels drop, air can enter the master cylinder. This compromises braking performance, reducing stopping power and posing a safety risk. You'll notice a soft or spongy feel in the brake pedal when compressed.

Look for leaks at the bleeder screws and brake lines, ensuring all connections are tight. Top off the fluid and bleed if necessary.

For street and daily-use vehicles, check each season and monitor levels every few months. Race cars and those used in performance events should be inspected before every track event.

Clear or translucent brake fluid indicates good condition, ensuring maximum performance. Cloudy, dirty, brown, or rust-colored fluid should be replaced.

Street cars should undergo replacement every two years or follow the OEM recommendation. Track-day vehicles need fluid replacement every season, with bleeding after each event for optimal performance.

Use a power bleeder or manually bleed the car, filling from the master cylinder until clear fluid emerges from each caliper bleeder screw. If unsure, seek help from a certified mechanic.

Stick to the OEM recommendation for street cars. Dot 3 is standard for commuter cars, while Dot 4 offers higher boiling temperatures but requires more frequent changes. Dot 5 is a specialty silicon-based fluid and isn't compatible with other brake fluids.

It's not recommended, but in emergencies, DOT 3 and 4 can be mixed temporarily. If mixing occurs, replace the brake fluid as soon as possible.