mack1

Hi natur3,

There is an adjustment under the brake pedal that will let you adjust the travel of the pedal to the master cylinder. If the pedal position is to low to the floor, adjust that linkage.

Note that the linkage pushes through the booster and if the booster don't work, the travel is about the same. You should have sufficient brake pedal.

If the pedal is spongy, then you need to bleed the brakes.
To bleed the brakes, get a freind to help. There is a bleed valve at each wheel (usually a valve that uses a 3/8 inch similar metric wrench to loosen).
The valve nut will have a hole in it to let the fluid/air out to a container.
Be sure to keep the master cylinder full of fluid during the bleeding process. If you let it run out, it will pump air into the lines and you will have to start all over again. Pump the brakes until you get some pedal. The helper at the wheel will open the valve and let the fluid/air drain out into a container. Hold the brake down until the valve is reclosed, then pump it up again and repeat the process. When all air is out, move to the next wheel. At the end of the process, you should have a solid brake position when pressed.

If the pedal slowly moves to the floor after bleeding, then there is a leak at one of the wheels or the master cylinder is leaking fluid past its pressure cup. If no leaks, then get a rebuild kit and work on the master cylinder. You can get an inexpensive drill type hone to hone out the master cyliner before installing the new cups. (should be like new when you finish and better than a junk yard replacement)

Note again that the brake position should be about the same with or without a good booster. The booster simply helps you apply pressure to the master cylinder.

Hope this helps.
Very best regards,
Mack1