Hello all!!

I have a 2002 XLS 4-door 4WD with 55k miles.  Recently I noticed that when I
press the brake pedal to stop the vehicle, just before the SUV comes to a
stop (maybe 2-3 seconds before) -- ...there is a feeling of a thump or a
light jumping sensation from the rear as the vehicle comes to a stop. This
is happening during the time I am modulating the pedal and slightly letting
up on the pedal just slightly during the last couple seconds of applying the
breaks before coming to a full stop (letting up on the pedal slightly to
come to a smooth stop.)

The brakes have all been replaced 4 months ago, and there are new tires
installed 2 months ago.  The rear diff was also serviced on TOC from Ford as
well as the both rear wheel hubs replaced on TOC.

Any ideas??  I checked and all the calipers are on correctly and everything
is on tight.  Could this be a bad caliper??

thanks for any advice!!!

~R