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| Joined: | 07-10-2012 |
| Location: | Whitehills , United Kingdom |
| Posts: | 168 |
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DOT 3,4 and 5.1 are glycol based and DOT 5 is Silicone based - glycol and silicone based fluids are not compatible with each other. In my case I upgraded the brakes to larger vented discs with 4 piston radial calipers on the front and rear discs with 2 piston calipers, but retained the original master cylinder. The braking system was previously filled with DOT 4 . The manufacturer of the discs and calipers (Hispec) advised me not to under any circumstances mix the two as the seals would be damaged -competition brake systems and road car upgrades are their core business so I would suggest that they have some experience in this field. DOT 5.1 has an even higher boiling point than DOT 5. I can't open the link you provided.
Gordon