Saturn Repair: brakes, brake fluid, u press

Question
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Followup To
Question -
For approx a year we've beening dealing with air in the rr brake line.  Unable to locate any leaks.  Have bleed using different methods, but after about a week of driving the brake is gone again. No signs of fluid loss. Have asked a friend who is a saturn tech if he's had anything like this.  He hasn't.  Any ideas?
97 SL2 w/o ABS
Answer -
Hi so the brake fluid reserve isnt low?and is it just the rr with the problem?

Thats it.

Answer
Hi what makes u think that there is air in the system when u bleed it does air come out? waht does the pedal feel like when u press it? also has there been any line or brake parts replaced since this problem started.. let me know this sounds interesting to try and solve..