ok i have a 1989 5.0l coupe.dropped it off at his shop for safety inspection.i could have done it at my shop but i got a traffic ticket for no safety sticker so i figured when i go to court it would look really shady if my license number and name was on the paper work.so heres my list of things wrong. front brakes,front rotors,rear shoes,spring kit,drums and wheel cylinders.yeah i know it seems like a lot but i already did the front brakes and im putting a complete rear in my car tomorrow from my totaled hatch all the brakes are new. ok so heres my question i suspect that my master cylinder is bad here's why if i have the engine off and i pump the pedal it comes up really high and as soon as i start the engine the pedal drops pretty far down.what do u think?