It supposd to be possible to completely flush the system of fluids...so to answer only one part of your query..alot more than a dribble !
I have no ex[erience of the modern gear..onr of the reasons I stay away from it...but I too wondered whether you should have the engine and/or ignition on, if they are power assisted brakes..?
I have no ex[erience of the modern gear..onr of the reasons I stay away from it...but I too wondered whether you should have the engine and/or ignition on, if they are power assisted brakes..?