I just had my '87 300E in for some brake work - front rotors and pads, plus a fluid change - and I've noticed that twice in the past week the pedal would travel two or three times as far before the brakes would engage. If I waited a moment, or pumped the pedal, pressure would come back to normal. I checked the reservoir, and the fluid is new, all the way up to the "max" line. Is this an air bubble stuck somewhere in the system? Any chance it would work it's way out? This hasn't been a very repeatable symptom.