I noticed a strange feel to the brake pedal about 1 week ago.  Skidded
on a wet road while stopping about the same time.  I continued to use
the car for short distances but observed a dragging when coasting.

Pulled into the drive and observed an excessively hot front left
rotor.  So.....

I pulled the wheel off.  Pulled the caliper assembly.  Inspected:  all
pads were adequate.
I put a 'C' clamp on it to widen the caliper for re-assembly and the
fluid resisted but the caliper did compress.

While it was disassembled,  I pumped the brakes to see if the caliper
was functioning.  It did not move.  I opened the caliper bleader and
pumped the pedal and nothing came out.

I traced the line back to the ABS unit, cracked it open and pumped the
brakes.  Nothing!
I then removed the line completely and pumped the pedal.  The pedal
was firm and did not bottom out, no fluid came out.

Next, I cracked the input lines to the ABS unit both front and rear
from the master cylinder.  Fluid sprayed nicely and the pedal bottomed
out.

All obvious fuses are good and the ABS light is not on.

This car is a beauty with 250,000 miles.  Just bought 4 new skins for
it.