Loss of brakes & brake fluid in the cab..

[stock75]

Hello all, hopin someone can help me out, was drivin home frolm work today and lost brake prssure, pedal goes to the floor at which point the rear wheels will locl up. I noticed a small amount of brake fluid inside the cab underneath the break pedal, is there some sprt of seal here or what? My brake fluid was shot, id been planning on going through the braking system in the near future, guess the time is now. What do you guys think? Could the master cylindar have failed?
Thanks
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