jimmy gmc 4x4 vacuum

Hey there.I have a 1996 GMC Jimmy 4.3L 4x4. My friend abandoned it last year and just left it in my driveway.I cant get a hold of him so i have no idea how or when this problem started. The problem seems to be with my brakes. When i push the brake pedal down with the engine running the pedal...

Alright this is my problem, i have a 95 GMC Jimmy and the 4x4 doesnt work. my switch is fine in the car, but when i hit the button i can hear the click noise but both 4 hi and 4 lo lights flash. there is a noise coming from the transfer case. i cleaned the tccm plugs and my actuator under my...