brake problems

[71charger]

Ever since I got my car Ive noticed the brakes are not the best. At first I had about maybe half my brakes, and now my brakes only work at about 1/4 of the way before it starts braking. I know my master cylinder has a leak around the seal, and not sure about the brake booster. I bled them a while back and the right rear had nothing but air in the line, after doing so it didnt make much of a difference. the front rotars and pads are good and do is the reaer drums. I don't think there is a hole in the lines cause my fluid levels are never dropping. any ideas???

[FLG]

Think you answered your own question with the MC leak 

Id start there.

[resq302]

Could be a variety of things.  Could be substandard pads / shoes, could be an internal leak in the master cylinder not causing enough pressure in the system, could be a bad brake booster starting to fail, could be a leak anywhere in your system, etc.

[68 RT]

Think you answered your own question with the MC leak      Id start there.

You think? 

[71charger]

thanks for the input. I had a feeling I was asking a dumb question. Just wanted to be sure before I start buying parts that I don't need.....again