Dear Mr. Morrison,
Thank you very much for your help. Sounds like that would explain it. I was mainly concerned that there not be something that could be dangerous.
Sounds like something easy enough to track down, hopefully fix, or worst case, just ignore and get brakes checked at regular intervals (as most cars don't have this device anyway).
Your kindness and expertise are much appreciated.
. 300 TD Turbodiesel 1985-W123