brakes popping Options

[FSX_Celica94GT]

when i last got my brakes redone (brakepads replaced and rotors smoothened [cant remember the rite word for smoothened]) and when i brake a certain amount, something in my back right wheel pops, i think it's the caliper, but i dont kno what would cause that, was it not put on right? my 2 front ones also pop but only when i reverse, and when i get out of my car and release my brake, my front ones pop but only once cuz when i try to do it again it doesnt do it, anyone kno what the problem might be?

[toyotatech]

BRAKE PAD CLICKING NOISE
Models:
’90 – ’00 All Models
Technical Service
BULLETIN
October 20, 2000
A clicking type noise may be noticed when first applying the brakes after changing
vehicle travel direction ( Drive/Forward to Reverse, Reverse to Drive/Forward). This is a
normal noise caused by the required brake pad–to–caliper clearances. When the
direction of travel is changed, the brake pads may “shift” towards the new direction of
travel. When the brake pad contacts the caliper, a clicking noise may be heard.
To minimize this clicking noise, a disc brake caliper grease has been made available for
use during brake service/maintenance operations. Under normal usage conditions this
grease should be effective for a period of 6 months to 1 year.


this is the tsb toyota released on the brake clicking noise