No brakes !!!!!!!!!!

[Dmfs90]

Have a 96 250 4x4 5spd. Was driving like usual whent to hit the brakes and all that happend was a hard pop at the top of the peddal and then it just started to hiss and go rig the floor. No leaks at the rim in front or back any help would b great.

[letitsno]

Sounds like the vacuum booster let go. Check fluid, if it's full, start at booster, master cylinder maybe bad. Good luck.