Hi guys! Need your help: Sequense of events:. 1977 450SL, passenger side brake in front pulled to right, brake light went on. Pulled drivers side wheel, caliper on wheel leaking slightly. Replaced with rebuilt calipers,(both sides) refaced front discs, new rubber brake lines, new front sensors. pads OK, Everything OK, firm brake,. 2 days later brake light back on instrument panel. Brakes feel firm.. master cylinder possible overfilled? sensor lines? Car brakes fine. your assistance appreciated. Abe G