5kQT rear brakes sticking

[ScottyCBoy@aol.com]

Hey I got a probelm...

While driving my 5kTQ in the summer heat, 95+ degrees, Both the rear brakes
stick after brake application.  The rear calipers are rebuilt V8 units with
new pads and rotors.  It happens when the ABS is on or off and dosn't go away
when using the ABS.  I have noticed if I hit a big bump just the right way the
calipers let go with an audile pop eminating from the front of the vehicle.  I
suspect it's either the brake booster or the prop valve, any suggestions??