Quote:
Originally Posted by Brian Carlton
DOT 4 has a higher boiling point but also appears to have a higher borate concentration to get that boiling point.
The rubber compounds in the brake system need to be designed to accept this higher borate concentration without excessive deterioration.
Many folks interchange DOT3 with DOT4, but unless absolutely necessary for a high performance vehicle, I'm not convinced it's a good idea.
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You'd go with the dot 4?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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