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You need to add BRAKE fluid. After that, blead your brakes. You need to find out where the brake fluid went. If there are no leaks, you need to check the remaining life on all four brake sets. If you have no leaks, chances are pretty good that you need new brakes.
is the abs light on?the abs system only effects the pedal when you are stopping quickly to activate the system. you still have a hydrualic brake pressure problem. are the rear brakes shoes or pads? rear shoes out of adjustment can cause a low brake pedal.even though the master cylinder has been replaced doesn't mean you got a good part.if the part was a remanufactered part very likely it is bad. to determine if it is the master cylinder, plug off the lines from the side off the master cylinder and hit the brake pedal. if the pedal stays up look for a problem elsewhere in the system. if the pedal drops the the master cylinder is defective.
You most likely have a faulty stop light switch. I have provided you with a couple of pictures. The first one in black and white is where you will find the switch and the second one is a picture of what your switch should look like but may not be what is in the car but you will get the idea. What happens is when you press the brake pedal a little button on the switch opens and when it opens it completes an electrical circuit and turns the brake lights on. when you let off the brake pedal the pedal comes back up and pushes that button back in to close the circuit. it is most likeley stuck open and not pushing back in when the pedal goes back up. When you see it you will understand better. I hope this helps you and good luck.
SOUND LIKE AIR IN BRAKE LINES.CHECK BRAKE FLUID LEVEL MAKE SURE ITS NOT LOW. CHECK ALL BRAKE HOSES AND BRAKE LINES. FOR LEAKS. YOU HAVE TO BLEED BRAKES.IF ALL IS GOOD.YOU HAVE MASTER CYLINDER AND ABS BRAKE FAILURE.HAVE DEALERSHIP FIX IT.THEY HAVE THE EQUIPMENT TO TROUBLE SHOOT AND BLEED THE BRAKE SYSTEM.
Sounds like two issue. The ABS unit might need replacement (known issue for ABS lights on) and the brakes need to be quality parts (ATE, Brembo, Girling, etc.) , not discount auto or pep boy type brakes. Those don't stop well. If the pedal travel is excessive, bleed the brake system first. If its still excessive, its most likely the master cylinder, not the booster (booster will make the pedal hard).
on the 93 there is a problem with the abs system. there are several things that could be wrong. if i remember correctly the module is behind the passenger side kick panel. you will find a single wire coming off the module. if you ground it then turn on the key it will flash the brake lights in the dash. count the flashes this is the code for the error. it will help in the repair. as for the second truck you have a leak that needs repaired.