[ProwlerGT]

Well I guess this was a lil bit of a false alarm. I lubed the bore with a straw all around it inside and then lubed the bolt/bushing well and it slides in and out of that thang very nicely now.

Just cause I could never get an answer from anyone (even on 2 other sites) I'm confirming that there is an air vacuum (or I should say "fullness") type effect created when the slider bolts go in the bores. As they (or at least just the top most bolt - the guide bolt with the bushing on it's end) screw inward into their threads on the caliper the force of air behind the bolt in the bore of the caliper bracket pushes back on the bolt. I know this because as I was threading it back inward I encountered resistance ("fullness") from the air behind it which actually pushes my hand in the outward direction. THIS IS WHERE THE SPREADING EFFECT HAPPENS WHEN YOU RELEASE THE BRAKE PEDAL! I never knew this till now.

So you have the pistons retracting into the caliper for 1 by the suction/vacuum effect created in the brake lines/reservoir after the brake pedal is released and 2 the slider bolts pushing the caliper back apart again so that the pads do not stay stuck to the discs causing overheat and loss of braking power/distance.

I put caliper glide/slider lube at the edges of the dust boots that surround the slider bolts as well to prevent water/debris entry into the bolt bore's over time.