Quote:
Originally Posted by t walgamuth
In my formula ford I have girling master cylinders. I have been using dot 3 synthetic. They have worn out with very little use. Dot 4 is recommended. Is it possible the dot 3 synthetic ate away the seals in the girling mc's?
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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.