Brakes stiff pedal and brakes aren't braking properly

What problem do you think is wrong with my car, when the brakes pedal and brakes aren't braking properly, usually touchy, bt stiffer now.

changed the alternator and a mate undid hoses above alternator area to get it out, and since then the braked have become stiller to push when braking, when they are usually quiet touchy braking pedals, unsure of what it could be, could it have something to do with hoses being undone above the alternator area? Or something else?