i have taken my engine out of the ka and im putting a bike engine in the rear but there is a vac hose that went from the brake master cylinder to the top of the inlet manifold and i think im going to need this for my brakes to work dose anyone have any clue as to what i can do here.

 

If you want to keep the servo assitance, you can buy a vacuum pump that is electrical, failing that other options are if the brakes are too hard fit a different master cylinder, I'd be mazed if they were too hard even without the servo assistance.
I'm assuming the bike engine has itb's ?, you could always tap into one tb for a vac signal but likely to be very little.
tabetha