When you press the car brake pedal you will notice that it goes down further than it used to be, there are two possible reasons that causes this kind of problem. Its either the fluid is very low or the shoe lining is worn.
To check which one of the two is the possible reason that causes the pedal to goes down further than it used to, is to first check if the brake have sufficient fluid in it, open the hood of the car and check the level of the fluid on the fluid reservoir, usually it is located on top of the brake master cylinder. As you may not know, when the fluid level is low the brake pedal will travel further before it will stop because the lower the fluid level the lower the pedal will travel. Just simply add the required amount of fluid to correct the problem, however the reason why the fluid level is low is another problem that needs to find out.
If for instance the fluid is at a normal level then the cause of having a pedal that goes down than it used to be is that the car brake shoe lining is worn, usually the rear brake is consisting of a drum brake system, that consist of a shoes. When the pedal is press the shoes also press against the inside of a drum. If the brake shoe lining is worn, the pedal will have to be press down further than it used to before the shoe lining touches the inside of a drum. To correct this kind of problem you have no choice but to bring the car to a reputable shop that specialized in brake works, not unless you know how to replace the worn shoe lining.
When replacing the brake shoe lining, consider also to machined the drums before installing a new lining.