brakes

[pipashlee]

hi all when i sit on the brake pedal long enough the brake starts to go towards the floor, the master cylinderlooks really new so i asked my mate whos training to be a mechanic, he said its the master cylinder faulty or an air lock between the MC and the ABS, but when he saw the MC he said it was new and it would be an air lock, how do I fix this its becoming really anoying its an 86 legend