Brake pedal went straight to the floor without resistance

SOURCE: Emergency break pedal stuck to floor, but break is disengaged

sounds like your brake cable has broken or there is something damaged in the pedal assembly.........try pulling on the release handle and move the e-brake pedal back to its off position by hand at the same time.(you may have to tie it in this position to keep it up)If that doesnt work there is a sensor on the pedal assembly that you should be able to bypass by either disconecting the wire(1 wire system) or connecting the two wires together (2 wire system)Especially if your truck is a standard the e-brake is an important safety feature,so if these steps fix the light and dinging problem you should still take the steps to have it repaired.
hope this helps.........Good Luck!

SOURCE: Emergency brake cable snapped.

cable get rusted and will brock,is wery semple to fix .poll taire and se if is brocen,cable is conected to rear caliper

SOURCE: Rear passenger side brake keeps hoping when brakes applied

hi make sure the hub flanges are clean and no rust

SOURCE: 2000 suburban dashboard brake idiot light won't go out

howdy, when the solid red brake light is on without an ABS light, it is usually low brake fluid in the master cylinder reservoir or the brake fluid level sensor in the reservoir is stuck or defective. let me know if this helps you ...... good luck.

SOURCE: parking brake pedal goes to floor

The disc brake pads are NOT used for the parking brake. The parking brake uses mini-drum type shoes inside the rear disc rotor.

Take a look at http://wiki.answers.com/Q/How_do_you_change_the_emergency_brake_pads_on_a_2000_Chevy_1500_Silverado_Pickup

For more info