“Can you do a quick brake job before you go on lunch?”

I was about to go on lunch when bossman asks if i can check the brakes for a customer. I go outside and see a squatted lifted super duty 6.blow on 40” tires and was told to test drive it and check for noise. When I go to stop the pedal sunk to the floor and i had to put all my force into it for it to just barely coast to a slow stop. Wasn’t safe to drive and suprised I didnt get into an accident. I pull it into the shop and get it in the air just to see that one of the pads fell out. The caliper on the pass side was pissing fluid every time the brake was applied. Calipers pads and rotors in the front and fluid flush all around.