Why squeaky brakes on jeep

The noise could be connected to the parking brake, or it could be a loose brake pad. When you engage the brakes the pads strike the rotors and then can not move around.

anti rattle plates are damaged, remove pads clean rear surface apply thin layer of silicon to pad allowing it to dry then reinstall as per std, this will stop the squeak, or replace anti rattles, silicon is cheaper will last the life of pad, but all new pads will have to be treated the in the same manner .

When a rotor is brand new they are coated with oil.....to keep from rusting...if you don't clean them before installing them it can lead to brake fade,glazing and or squeaking...you may have a caliper seizing up keep the brakes lightly applied good luck

Wheres soubd coming from...front or rear. Sound only when applying brakes?

one thing you didn't mention is if the dealer replaced the caliper hardware. take alook at this:
http://www.aa1car.com/library/tr996.htm

is it a constant squeak or intermittent. Pay attention to whats happening to the vehicle when the noise is being made. Brakes need replaced, or squeaky suspension?

There are a numer of reasons brakes will squeak or squeal. Sometimes excessive dust acculation wll cause it, yet another cause is the TYPE of material the brake shoes are made of. The harder the brake shoe material , the more tendency to squeak / squeal. My suggestion is use high quality brakes such as OE brakes. Hope this helps.

semi-metallic pads can cause noise from glazing over if you are too rough on them, or a crappy pad composition. get some BG brand STOP SQUEAL and apply it to the pads. clears it right up

there is two things that can cause brakes to squeak: brake dust and not having some brake antisqueak on the back of the pads.
you may have to take off the calipers and put some brake antisqueak on the back of the pads and you can get this at any auto store and see if that helps with the squeaking

sometimes if they get a glaze effect they will glaze up causing squeaks. Are they very shiny? if so they are glazed. Also are they factory pads or aftermarket do you know? Metallic pads almost always will give off a little squeak. If you know how to take off wheel and caliper you can remove the rotors and bring them into parts store and they can turn them real quick for you for about 20-30 for both of them. Just do the fronts. if you say your pads are fine leave them alone and just reuse them. This will help renew the brakes alittle but when you do replace pads in future always replace rotors as well dont turn them with new pads. and if you can, go with ceramic pads. less likely to squeal but just for a few hundred miles untill break in is over.