Brakes Feel Soft or Spongy? Fix Brakes Going to the Floor Effectively

The brake pedal will ever so slowly descend down while waiting for the light to change ( my brake fluid levels are stable/fine) any one have idea on what this ... Pedal going to the floor is a usual indication of leak or air in the system. But If you have a leaking brake booster, vacuum lines to it and if I am correct ... When you hit the pedal it pops then brakes go to floor. So thinkin the piston in the master cylinder sat in one spot for so many years that ... The loss of brake fluid leads to a loss of hydraulic pressure, so the brake pedal will feel soft or low and go to the floor. Leaking disc brake caliper(s). Like ... A sinking brake pedal slowly drops to the floor as you exert the same pressure. You'll be able to feel the pedal sinking when you're stopped at a stoplight or ... It's not actually on the floor; you still have some breaking if only one of the two circuits fails. I'd first look for a leaking line, usually ... It turns out that it was caused by one of the rear wheel cylinders leaking brake fluid past the piston cup seal. The internal cups weren't ... Try replacing the brake fluid, check pads and discs etc. Sounds like old, spongy fluid to me. I have to press the brake pedal all the way to the floor to get it to stop. Even then it sounds bad. If i pump it then it kinda slows down but not that much. ... Probably a small leak in the system. Check the fluid level then start the car and pump the brakes a bunch and check the level again. If it's ...