ok so, ive rebuilt all my calipers, i think i got all the air out of the lines, and my brake pedal still sinks to the floor. could this be anything easier or cheaper than a new master cylinder? and would a master out of a SE 4 lug model fit my GXL?

 

Probably the master cyl, and no a SE brake master would not work unless you have removed the AAS and the car didn't have ABS

 

a new master isn't *that* much money, especially considering how important it is.

About $100 will net you a new, rebuilt unit.

HINT - bench bleed the sucker before you install it.......