Air in the brake system would result in spongy brakes, Hesitation to stopping sounds more like a blockage in the system or stuck or jammed pistons, either disc pads or drum brake slave cylinders. Try a thorough bleeding of the system, replacing all the fluid and check that each wheel in fact locks when the pedal is depressed and the wheel is clear of the ground.
Please be aware that the situation is dangerous and needs urgent attention, preferably by a qualified person.
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