Why does my Brake Pedal Go to the Floor?

Answer

Your brake pedal goes to the floor because you have a bad cylinder leaking somewhere. When a cylinder is leaking the fluid gushes out thus there is no pressure in the lines to keep a hard pedal. You also have air in the line as when you press down and release it will suck air into the system from the leaking area. Have your brakes checked immediately to fix and bleed your breaks. Air does not enter the system unless there is a problem and that should be fixed first.
1 Additional Answer
Your brake pedal may go to the floor because it is time for new brakes. If you are having a hard time braking take your vehicle into your local auto shop to have the brakes checked.
Q&A Related to "Why does my Brake Pedal Go to the Floor?"
Defective master cylinder, low of fluid, or leak somewhere else in the system.
http://wiki.answers.com/Q/Why_does_brake_pedal_go_...
Check for leaks :at the break cylinder or at tires break cylinders. The leaking place needs replacement of rubber parts.
http://answers.yahoo.com/question/index?qid=200702...
Paul I still believe you have the wrong Booster od you have adjusted for the loss of the reaction disc. Here is some other info that may be pertinent. 1997 and earlier diesel trucks
http://www.thedieselstop.com/forums/f30/why-brake-...
1. Open the hood of the Dakota. Inspect the brake fluid reservoir level. The brake fluid should be at the "Full" mark if your brake lines are functioning well, and your
http://www.ehow.com/how_8745940_troubleshoot-brake...
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