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Old Jun 6, 2006 | 06:30 PM
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Is anyone using Dot 4 brake fluid in their hydraulics?...I've heard that it would require a different type of seal due to the silicon content??? I believe that the new ZO6 is using DOT 4...
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Old Jun 6, 2006 | 06:36 PM
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I hope not Iam about to flush my system and use dot 4.
-Brandon
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Old Jun 7, 2006 | 07:51 AM
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Originally Posted by lt1_man
I hope not Iam about to flush my system and use dot 4.
-Brandon
Me too! Anyone have any info on this?!?
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Old Jun 7, 2006 | 08:08 AM
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I'm using a synthetic dot3/4 hybrid by Valvoline... works great so far.
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Old Jun 7, 2006 | 08:08 AM
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DOT 4 has properties enabling it to withstand higher temps w/o boiling. DOT 3 is the standard issue brake fluid and will boil at a lower temp vs DOT 4. Boiled fluid is not a pleasant thing on a race track. 130mph heading into a turn and no brakes.

DOT 3 or 4 fluids don't contain silicone. Each is compatable with the other.

The only one containing silicone is DOT 5. It is not typically used for high performance uses. It is used in museum cars as the fluid won't harm the paint.

Steve
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Old Jun 7, 2006 | 08:18 AM
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^^^Thanks.
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Old Jun 7, 2006 | 09:48 AM
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thanks for the info steve, good to know!
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Old Jun 7, 2006 | 04:14 PM
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Originally Posted by steve-d
DOT 4 has properties enabling it to withstand higher temps w/o boiling. DOT 3 is the standard issue brake fluid and will boil at a lower temp vs DOT 4. Boiled fluid is not a pleasant thing on a race track. 130mph heading into a turn and no brakes.

DOT 3 or 4 fluids don't contain silicone. Each is compatable with the other.

The only one containing silicone is DOT 5. It is not typically used for high performance uses. It is used in museum cars as the fluid won't harm the paint.

Steve
EXACTLY! Could not have said it better. Just STAY AWAY from DOT 5 silicone fluids, both for brakes as well as clutch masters. DOT 5.1 though, is fine, in fact can be better against heat and moisture absorbtion than DOT 3/4 fluids. Pay attention though, some high perf./high boiling point fluids are not compatible with all other fluids despite carrying the same DOT rating (different chemical compositions). I run NEO 610 in my clutch master and GS610 in my brake reservoir.
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