Today this happened for the 2nd time.  I use the park brake every time I
park the truck, and today when I released the brake with the little
left-knee handle, the brakes did not release.  Because I have a 4WD, but
in 2WD at the time, I'm assuming the drums are locking up.  After I
apply some torque from the engine, there is a frightening "SNAP!" and
then things rotate as they should.

The first time this happened, I was driving through wet, wet slush in
the spring-time.  I parked the thing and the weather turned cold.  I
assumed that there had been water get somewhere and it froze up on me.

But not this time.  I parked the beast Monday night and today it was
"frozen" up on me again.

Is the braking system trying to tell me something?  Should I be
dismantling and cleaning something?

Any help would be appreciated.

Thanx.

HR.