What is the difference between DOT 3 and Dot 4.

Tiny
ANONYMOUS
  • 2000 VOLKSWAGEN BEETLE
  • 94,000 MILES

What is the difference between DOT 3 and Dot 4 brake fluid. Can they be mixed as I can't find Dot 4?

Monday, October 29th, 2012 AT 1:28 PM

2 Replies

Tiny
ASEMASTER6371
  • EXPERT
  • 25,554 POSTS

Its all about the boiling point. Dot 4 higher.

What does your car call for

Roy

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Monday, October 29th, 2012 AT 1:32 PM
Tiny
EXOVCDS
  • MEMBER

You can add dot 4 to a dot 3 system, but you can't add dot 3 to a dot 4 system.

Dot 4 is pretty standard and should be easily found at auto parts places or vw dealers.

You shouldn't have to add fluid to your reservoir. The only time the fluid should be low, is
if the brake pads have worn down or if there is a leak.

Have your brakes checked.

Thomas

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Tuesday, October 30th, 2012 AT 2:06 AM

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