Here's a weird one, anyone have a similar experience?  I spent last week
at 6300 feet on the east slope of the Cascades (Table Mountain) with
about 1200+ other amateur astronomers.  Sunday, coming down, almost at
the bottom, I noticed that my speedometer was sitting on zero.  This was
near the end of about a 4,000 foot drop over 12 miles on a winding,
narrow road, all in 2nd gear (automatic) all the way down, but still a
lot of braking.  The brakes never faded, but I know they were hot.  What
was strange, once I got down in the flat, and before the brakes really
had any time to cool, the speedo twitched a couple of time, then started
to work just fine, no problems since.  The question I'm left with is
this:  Do I have a failure pending in the speedometer or the associated
cables or the box they go thru?  or is this just a consequence of hot
brakes, something expanding and then cooling down?