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A brake pedal going directly to the floor is a sign of a few things. First, you are in need of brake fluid. Second, the brake pads are probably almost worn out. They may be worn out past the point the ABS light would be active. The ABS light may also be burned out.
The brake light switch is out of alligment. Check on the brake pedal arm and readjust the switch.
Brake light switches are above the brake pedal
When you hold pressure on the brake pedal at a stop light and the pedal slowly drops to the floor and the brake fluid reservoir still remains full, the master is bad.
usually they will leak out the back by the booster, your brake pedal will slowly go to the floor at stops or the brake pedal will go right to the floor when pushed.
Something is impairing the brake pedal to go to the floor. Only a mechanic can tell you what is happening.
The brake light switch on a Nissan is located just behind the brake pedal. It sends a signal to the brake lights when the pedal is pressed to turn them on.
check brake light fuse and brake light switch on pedal
Above the brake pedal where the master cylinder is attached to the brake pedal assembly.
no you have a brake fluid leak somewere
Look under the dash on the driver's side, half way down the brake pedal. When you depress the brake pedal, the pedal moves away from this switch, which allows the brake light pedal circuit to complete, and your brake lights come on. This brake light switch is always hot/on, as required by federal law, so that even with no key in the ignition, if you hit your brake pedal, the brake lights will come on.
Above the brake pedal, on top of the pedal lever.