[s-cars] Help: Right Rear Caliper Problems

[Dave Forgie]

I just discovered that my right rear caliper seems to be partially stuck
on. (Wheel is warm and I can smell a phenolic odour from the pads).  It
is about -5 deg. C and snowing.  I thought the car was slowing rather
quickly with "no" brakes and the clutch in.

I presume that either it is an emergency brake cable issue or a caliper
piston.  What is the usual/quickest diagnostic procedure?

Dave F.