My comments assume the brake booster is correct for the application. The OP states that the pedal travel is normal 1" or so [ post #3 ] & pedal is 'rock hard '. That tells you: no air in the system.
So how can it be lack of travel??? Using that 'logic', you would not be able to bleed the brakes using the pedal because the you would not be able to move the pistons in the m/c far enough to push the air out!!