Synthetic Brake Fluid
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Senior User
Joined: Jun 2003
Posts: 141
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From: Midwest in Harry's Town
Synthetic Brake Fluid
Hey you all I need a little help..
I am rebuilding my brake system and want to know what the word is on Synthetic Brake Fluid...???
Is it any good.?? Does is meet or exceed DOT3 spec..??
Any input would be great...
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
DOT 5 from what i read is not to be used in ABS systems. also to use DOT 5 in place of DOT 3 requires 100% new components. the slightest amount of DOT 3 will react with it and it eats rubber. i
Elder User
Joined: Apr 2004
Posts: 970
Likes: 3
DOT 5 fluid is silicon based and no way compatable with dot 3.
Previous poster correct Dot 5 does not wick moisture. While I'm
not up on the sythetic dot 3 fluids I would guess that is the reason
for their development. I think if you search the net you could find
the rating difference between them. Alot of it has to do with boiling
points of the fluids. Me I've been exposed to dot 5 silicone fluids
at a former employers, I could not see much gained in normal application
for the greatly increased cost. I still use the old dot 3 fluids in my stuff and
have had no problems.
Previous poster correct Dot 5 does not wick moisture. While I'm
not up on the sythetic dot 3 fluids I would guess that is the reason
for their development. I think if you search the net you could find
the rating difference between them. Alot of it has to do with boiling
points of the fluids. Me I've been exposed to dot 5 silicone fluids
at a former employers, I could not see much gained in normal application
for the greatly increased cost. I still use the old dot 3 fluids in my stuff and
have had no problems.
Elder User
Joined: Nov 2005
Posts: 654
Likes: 0
Like the above poster said, if it is silicone based, it is not at all compatable with. Not all DOT 5 fluid is silicone based though so it is possible to have a DOT 5 fluid the is DOT3/4 compatable. If it is glycol based like DOT3 and 4, it will get along but if it is silicone, you really need a new fresh system for it to work correctly. The DOT 5 standard does not mandate the use of silicone, it only basically states the specs of the fluid for tempature stabilty/boil point.
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