brake fliud leak, which runs throughout braking system. chk for cut pipes etc. as you noticed leakage on frt wheel. didnt you notice brake light indicator on in dash?
the handbrake works though , in case of failure, pump padel this might build brake pressure from remaining fluid and downshift gears as they get avaliable on speed reduction. after reaching 1st gear, switch off ignition and steer for avaliable road till dead stop jerk.
shift to 2 and then 1 or Low in automatic ,, pull handbrake.