DOT 4 vs DOT 3 brake fluid

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08-25-2010, 05:24 AM

#21

Sleeper_08

4th Gear Member

Join Date: Dec 2007

Location: Ontario, Canada

Posts: 1,692

If you are running DOT4 fluid it is suggested that you flush once a year as it tends to absorb water faster than DOT3 fluid and when DOT4 contains water it's boiling point drops off quickly.

08-25-2010, 10:06 PM

#22

imfamousjim

1st Gear Member

Join Date: Nov 2007

Location:

Posts: 122

yup, Ive got it on my "mid summer checklist"

08-26-2010, 10:39 PM

#23

Bmr4life

5th Gear Member

Join Date: Mar 2006

Location: ATL

Posts: 2,955

Quote:

Originally Posted by imfamousjim

I just flushed my system with DOT4, took about a quart and a half... Pedal feels very different, I didn't even really notice how spongy it before the new fluid. My car is an 05 with 66k miles, fluid flushes just got added to my regular maintenance checklist (especially with track days in the future).

I notice mine is spongy also. I'd like to flush soon. Anyone have a how to for this?

Also, is Valvoline Dot 3/Dot 4 brake fluid any good?

Last edited by Bmr4life; 08-26-2010 at 10:49 PM.