2. Bleed the brakes. Air can get into the brake lines when they run dry, causing the pedal to go to the floor. Bleeding the brakes removes the air and restores the proper function of the brake system.
3. Adjust the brake pedal. If the pedal is still low after bleeding the brakes, it may need to be adjusted. Consult your vehicle's repair manual for instructions on how to do this.
4. If the pedal still goes to the floor after taking these steps, there may be a problem with the master cylinder or brake booster. Check these components and replace them if necessary.