Not to get too far off track but, I was told in my Hydraulics Brakes session at college, that you can mix DOT 3 and DOT 4, the only difference is that DOT 4 has a higher boiling point than DOT 3, but not by much. So I am not sure why DOT 3 is would affect the brakes in the hydraulic action.
They do have this stuff called DOT 5 which is like a synthetic brake fluid used in high speed/high performance motor sports, and that is purple colored. It has a rather high boiling point, and cannot be used in a conventional system or more-or-less mixed in with DOT 3 or 4.
They also have this stuff called DOT 5.1 which can be mixed with DOT 3 or 4.
Just my two cents. 
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Pat Albaugh, Midwest Moderator
"Diffage" -the point at which the truck's differential makes contact with the ground.
http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006)
1995 RRC LWB
-LT265/75R16 Pathfinder All Terrains
-RTE 2" Lift Springs
-Pro Comp ES9000 Shocks (from DAP Enterprises)
-KMC Front Diff Guard
-4 Desert Fox 55 watt Lighting
-Radio Shack CB Radio (never know when signal fails on a cell phone)
-2 Halogen Super Sport 100 watt forward lights
-Custom slim style front bumper w/ integrated bull bar
-Lowe's Special "Homemade" Snorkel
-T-Case out of an 92' RRC
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