I've had this orange light turn on twice while at a stop light. As soon as I start moving again, the light goes out.

Oops, forgot to mention it's an 81 300D

Brake pad sensor is telling you to check/replace pads/rotors.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

Ahh, that would explain the slight grinding I felt this morning. I figured it was just surface rust because it went away almost immediatly.

I guess I'll be doing brakes in the morning then.

When the wear sensor light goes off you should still have a fair amount of brake pad left. It never hurts to change them right away but if you can't get to it right away don't sweat it. Depending upon how you drive you should have another 500-1,000 miles left.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold