My mechanic recently changed out the disk pads on my '84 (7-passenger).
First there were occasional chirping noises from right front each time
the wheel made a complete revolution.  If I were making a turn or
applying the service brakes, chirping stopped.  Mechanic rechecked his
work and said all okay.  Now chirping has started on left wheel too and
is occurring just about all the time.  However, it does stop when
service brakes applied.  Stopping van with parking brake has no effect
on chirping.  Turning wheel from left to right will change amount of
chirping.

Any ideas what is going on?

John