Brake problems

[Swoyke69]

I'm new to this site. I need help bad. I have a 99 explorer with a 4.0 sohc v6 xlt. I have replaced the back rotors and calipers and pads. As well as the front. I have also replaced the master cyclinder and bled the brakes. I have great pedal pressure when the car is off but when I crank it the pedal goes to the floor. I'm getting very frustrated. Can someone please help me

 

[BrooklynBay]

Welcome to this forum! It sounds like there's still air in the system.

 

[swshawaii]

Ditto. Any chance the caliper sides were switched when you replaced them? Bleeders up?

http://www.explorerforum.com/forums/showthread.php?t=309983

 

[joecrna]

Did you pull the reservoir dry when bleeding. If so you likely introduced air into the ABS. It does sound like there is still air in there somewhere.

 

[Bobmbx]

It sounds like a bad booster, esp since you mentioned the 'swooshing' sound.

In addition, you may want to check the booster push rod length since you replaced the MC.