Ok so lately my brake pedal feel has been changing daily. Some days pedal goes to floor and only slightly brakes at the very bottom. Other days it hard and brakes at the very top. Yesterday my pads started squeaking so today I changed them. Found the passenger pads totally worn out but driver side were strangely almost new.
Car has been pulling to the right upon hard braking also. After putting on the pads I have no pressure at all but it kinda horribly stops by the right side skidding tires and nothing noticed from the driver side. Here is another symptom, when you get on and off the brakes the idle jumps bouncing from 200-3500rpms. Also the piston on the caliper had the rubber kinda out of place on the driver side.
So I know I wrote a book here sorry, you guys think its a booster or master problem? Or check valve? Or caliper issue? I don't know what to go buy and this is my 86 mile one way commuter I just recently bought. Need to drive to work Monday morning! Thanks everyone.

 

By the way. I've checked for leaks inside and out. Bled the brakes too

 

Master cylinder is most likely internally leaking. Since the system is also diagonally split, and only half of the system is doing to work, this would account for the worn pads on passenger side(right) and the pull to the right as you brake. LF/RR is one circuit RF/LR is the other.

 

That's what I was thinking was going on without beig a me to articulate it. Thanks. Will be throwing one on today with any luck be good to go.

 

You should be able to verify by bleeding the brakes.