What brake fluid is in it now. A change usually means new seals and new hoses.
DOT 4 as standard, easy to upgrade to 5.1 with just the usual flush through and bleed (which should be done every 2 yrs or so with DOT 4) compatible with existing seals & hoses etc
5.1 is not to be confused with 5 which is silicone based and should not be mixed
