Every time I go to brake I have to floor the brake to stop my jeep. Even pressing the brake lightly or tapping it a little doesn't stop it or slow it down. I have no idea why it's doing this or how. Any ideas?

 

Check the vacuum hose on the brake booster.

 

yup the vac line does more then you think it is not connected you have basically no brakes and make sure the fluid looks ok

 

how r ur pads and rotors? is there fluid in the master? making any noise? sounds like u might have air in thee system or maybe a broken brake line. any puddles under the jeep?

 

Jack it up, put a stand under it and see if you can spin the wheel when a helper pushes the brake.

 

definetly cthe booster

 

I agree with the guys on the booster possibly being bad. The seals on your MC piston could be bad too allowing fluid past when you push the brake pedal. I'v ehad this happen to me with several clutch master Cylinders in my Toy truck I had.

 

Another thing to check is your rear brake shoe's adjustment.