I have an 03 Chevy S-10 The parking brake will work if you hold the pedal down but the pedal won't stay What is wrong Simple fix?

There is a good chance the spring that locks the pedal down is out of place. It may have popped out because of to much slack in the cables. You need to remove the parking brake pedal mechanism and reset the spring. After doing that reinstall the assembly and adjust parking brakes and cables to take up slack.