G'day all,

Will be updating the single pot front brake on the old girl  real soon and she is running DOT 5 brake fluid according to the HD bible. Now I am looking at getting one of them Brembo's 4 pot calipers but was informed and advised to run DOT 4 in the brake system.

So that means that I will have to flush the the master cylinder and hose, so what is the best product to achieve this and while I am at it should I flush the back system and run DOT 4 to save on confusion ?.

Also will there be any pit falls and advantages to changing the master cylinder to a 11/16" bore master cylinder off a dual disc model ?.