more than likely you have air in brake line and need to bleed brakes
press down firmly on the brake pedal and keep holding down the brake pedal
when your brake pedal moves up and down when you press the pedal ,usually it is a warped brake rotor or a loose bearing on one or both brake rotors Warped front disk brake rotors.
Brake booster problem?
press back down on the pedal
Is your parking brake on?
Adjust or replace the stoplight switch at the upper end of the brake pedal under dash area
there's not hand brake. what you would find is a pedal brake in the bottom left of the driver side. Witch you press down to apply it, and press down again to release it. Hope this help you.
Faulty Vacuum Brake Booster.
The brake light switch is out of adjustment.
put your foot on the brake pedal and press down while some one looks at the brake light to see if it lights up
Your rotors are either worn unevenly, warped or both. Replace them next brake job.
press the pedal down as far as you can and as it goes up...it should release it...