96OutbackGNW

96 Outback 140k. Keep having to add fluid every 600-2500 miles. Light comes on when low. No visible leaks. My Mech has put some sort of "brick", pressure on the pedal for days, no leaking found. Checked all visible hoses, Master, behind booster. He has looked at it several times over months. This week took to a different town and went to recommended locations and guys at Les Schwab and Midas. Both found no leaking. One suggested removing the seats and then the floorplate ?? to look at hidden brakelines. Anyone know how to do that? Can I do it? ANY other suggestions? This is driving me crazy, I love this car, have owned since new, but feel it is unsafe to drive. Live on Olympic Peninsula, but car is now in Puyallup, Tacoma area if you can suggest a great, and reasonable brake guy, anywhere in the N.Seattle to Olympia area. I'm Desperate. Thanks for advice, suggestions. Jim PS Talked to one dealer in Bremerton... useless