If there is no resistance when you do this you are likely to have air in the brake lines or you have lost your break fluid. (Don't drive you car with faulty breaks).
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.
When you press and hold the brake pedal it will slowly move to the floor. It can also have a catastrophic failure and go straight to the floor with no stopping ability at all. If you hold the brake pedal down and it slowly moves to the floor any at all, replace the master cylinder.
You don't have brake fluid There could be air in the system and it requires bleeding to rid it of air. If the vehicle is an older one, the master cylinder may be porus or the bore pitted. It should be resleeved or replaced. The seals could also be flat. Jam your foot down hard on the brake pedal. Is the pedal high? Does it sink to the floor if you rest your foot lightly on the pedal? www.powerbrakeandsteering.co.za
Brake booster problem?
press back down on the pedal
Start the engine. Place you foot on the brake pedal, and press fairly hard and hold the pedal down. If the pedal very slowly, moves toward the floor any at all, the master cylinder is defective. Replace it immediately!!!!!
You replace it when you have the first sign it is going bad. Stop, press the brake pedal and hold steady pressure on the pedal for 30 seconds. If the pedal moves at all down toward the floor. replace it. Otherwise it is functioning as it should.
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.