Press on brakes they go to the floor with little or no pressure

You have little or no fluid in the system. The first thing to do is to check the fluid level. If it is full you need to bleed the air out of the lines. If it is low, fill it up and press the brake pedal. While you press the pedal have somebody else look outside the car to see if there is any fluid leaking out of a broken brake line. If you do not see any leaks and the fluid still goes low it may be leaking into the brake booster. There is no way to check that except by replacing the master cylinder.

Sounds like a fluid Hydraulic leak in the brake system.
DO NOT DRIVE !!!!! this Truck.
TOW your vehicle to your service repair shop for futher inspection.
Possible problems can be -rusted brake lines, leaking calipers or wheel cylinders, leaking master cylinder...

be- safe -tow the truck to your mechanic


























drive

Most likely it could be a line leak or wheel cylinder leak, this is common in old cars. 19 years is bound to have an effect on the braking system. Check to see if there are any signs of leaking. If you leave it and leave it, it will get worse and more dangerous. Get a mechanic to check it out otherwise 1. it will be very dangerous 2. it will cost more to fix the longer you leave it.

To check its not something simple, also check your brake fluid level, if it's low top it up.