Brake Fluid FAQ
1
What’s the difference between DOT 3 and DOT 4 brake fluid?
DOT 3 and DOT 4 brake fluids both perform the same basic function but differ in their boiling points and heat resistance. DOT 4 brake fluid has a higher boiling point, making it better for modern vehicles, performance cars, and ABS systems, while DOT 3 is ideal for standard passenger vehicles.
2
Can I mix DOT 3 and DOT 4 brake fluid?
Technically yes, since both are glycol-based, but it’s not recommended. Mixing them can lower the overall boiling point and reduce braking efficiency. Always use the fluid type specified in your owner’s manual.
3
How often should brake fluid be changed?
Most manufacturers recommend flushing and replacing brake fluid every 2 to 3 years or around 30,000 miles. Vehicles in humid climates or heavy traffic should have brake fluid checked more frequently.
4
What happens if brake fluid gets low?
Low brake fluid can cause spongy brakes, longer stopping distances, or even brake failure. It often indicates worn brake pads or leaks in the system that should be inspected immediately.
5
Which brake fluid brands are best for my car?
Top-rated brands include Prestone, Valvoline, Lucas, Pentosin, Motorcraft, AMSOIL, and ShopPro. These are trusted for use in Honda, Toyota, Ford, Chevrolet, and Jeep vehicles. Always select the DOT rating and brand that meet your manufacturer’s standards.
6
Does synthetic brake fluid make a difference?
Yes. Synthetic brake fluids like AMSOIL and Prestone DOT 4 offer better moisture control, corrosion resistance, and high-temperature stability, making them ideal for vehicles with ABS and performance braking systems.
7
How can I tell if my brake fluid needs changing?
Check the color—fresh brake fluid is clear to light amber. If it appears dark brown or black, it’s contaminated and should be replaced immediately.