What kind of brake fluid does a Ford F350 take?
The Ford F-350 typically uses DOT 4 brake fluid, a glycol-based fluid with a higher boiling point than DOT 3. Always verify the exact specification for your model and year in the owner's manual or on the brake fluid reservoir label, and never mix different DOT grades.
Typical brake fluid specification for the F-350
Brake fluid choices are defined by the Department of Transportation (DOT) grades. For most late-model F-Series trucks, Ford specifies DOT 4 to handle heat and heavy use. Some older applications may call for DOT 3. DOT 5 is silicone-based and not compatible with standard ABS-equipped brake systems; DOT 5.1 is glycol-based and can be used in places where the manufacturer allows, but you should not mix grades.
Common options you might encounter include:
- DOT 3: A glycol-based fluid with a lower boiling point; use only if your manual explicitly calls for DOT 3.
- DOT 4: Higher boiling point, compatible with ABS and most modern brake systems; the typical pick for new F-350s.
- DOT 5.1: Even higher boiling point than DOT 4; glycol-based and compatible with many systems when the manual allows; do not mix with DOT 3 or DOT 4 unless required.
- DOT 5: Silicone-based; not compatible with most Ford brake systems and with ABS; not recommended unless the manual specifies it.
In practice, unless your model year or trim specifies otherwise, you should use DOT 4 brake fluid for topping up or flushing the system. If in doubt, consult the owner's manual or your Ford dealer for the exact specification for your vehicle's year and configuration.
How to verify the correct fluid for your vehicle
To ensure you use the correct brake fluid, check the following sources: the owner's manual; the information sticker on the brake fluid reservoir or engine bay; or Ford's official service literature. Use only the grade specified and never mix different DOT grades during a single service. When flushing, consider using the exact product recommended by Ford to preserve the system's seals and ABS components.
Summary
Most Ford F-350 trucks require DOT 4 brake fluid, with older models possibly using DOT 3. Avoid DOT 5 silicone-based fluid and only use DOT grades compatible with your vehicle as specified by Ford. Always verify from official sources and never mix different DOT fluids.
