1999 gmc siera with auto transmission, and four wheel drive 50k parking brake used less than 20 times, petal goes to floor when apply as if it is not contacted'
I had same problem on 2002 with 25K miles. I went to push the parking brake and it made a loud snap and went right to the floor. and there was no return spring tension on the pedal and the release lever required me to manually pick up the foot pedal. I went under the vehicle and noticed quite a bit of sag on the cable running to the back of the truck. So I removed the cable and noticed the end of it which connects to the foot pedal assembly has the end of it sheared off. GMC -- professional grade ...
I had the same problem with the 2002 "Professional Grade" GMC sierra 1500 with 40478 miles on it. I pushed the brake and it made a loud snap and the pedal went down to the floor, although if you release the lever the pedal will go back. I bet the cable snapped - I am going to contact NHTSA and see what they can do - it is a serious safety issue.
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You either have air in the brake lines, a cracked brake line, or low of brake fluid... either way you will need to bleed the brakes
have you had the brake pads changed recently?
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