On the test drive for my Pyrometer I was going 65 and all of a sudden I heard a loud squeal. I immediately shut off the engine and coasted to a stop. As I slowed through 10 MPH the sound changed, then stopped when the car did. I restarted the car and drove off, and the squeal started again. Eventually I pulled over again to take a look, but after stopping and turning off the car I decided to wait until morning to have a look. When I drove home the noise did not return. The speedometer and odometer still worked during and after the sound.

Anybody hear of something like this before?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine