1998 Pontiac Grand Am Where is the air?

Brakes problem
1998 Pontiac Grand Am 6 cyl Front Wheel Drive Automatic ~102k miles

the shop at the college im attending has a pressure bleeder that I used to bleed the breaks on my car, twice following the procedure abs, right-rear, left etc. Ive done it twice, the first time I got alot of air out, the second time nothing just clean fluid, of all the driving/braking the fluid doesn't seem to go down so I dont think it would be a leak yet it is still very spongy 2 valves on abs module, and all 4 tires have been bled both times, I dont know where else there could be air and im stumped