You wouldn't be asking this question if you knew how to work on your brakes, so I suggest you get the vehicle into a brake shop ASAP before someone gets hurt
The good thing is they know how to use the hand brake.
Brake fluid and bleef the brakes if that still doesnt do then take it in.
Looking for a Used Rodeo in your area?
CarGurus has 128 nationwide Rodeo listings starting at $1,200.
Search Isuzu Rodeo Questions
Isuzu Rodeo Experts