Brakes squeaking could and probably is the dust being trapped between the pad and the rotor. There are several ways to fix this.
You can replace the pads with higher quality pads. That doesn't mean the top dollar pads you have to order from a catalog, just the premium pads from the local parts store. The manufacters use cheap parts at production to keep costs down and profit up.
If you do, or even if you don't replace the pads atleast buy a bottle of anti-squeak stuff from the parts store. I've seen it in a sqeeze bottle and its orange (atleast the stuff I use is), you put it between the pad backing and the caliper. Don't be afraid of this stuff, but don't slob it on there TOO heavy.
Another possibility is to buy and install slotted brake rotors. You probably won't ever need the cross-drilled and slotted rotors (thats primarily for HIGH performance cars/trucks), but the slots will help channel the dust and hot air away from the pads. Which will give you better braking.
Replacing the rubber hoses with stainless steel braided will make a HUGE difference in brake feel and functionality. You'll want to replace the rubber hose that goes from the frame to the axle (if applicable on newer trucks I'm not sure), and the rubber hose that goes to the brake caliper. The rubber hoses will flex when you force the brake fluid thru them, the stainless hoses will flex a little but NOT nearly as much as the rubber hoses. That lack of flexing will keep the pressure more steady which will result in better braking and a much more sure footed feeling in the brake pedal.
Just make sure you bleed the brakes out after you install new pads and or brake lines. You don't really have to bleed the brakes out after installing new pads, but if you think about it the fluid closest to the rotors will get hot and could boil under hard/consistant braking over the years. So if you bleed out the stuff closest to the rotor (pump the pressure up, bleed it, pump the pressure up and hold, then bleed it a second time should work fine) it will bleed off any boiled fluid or air that is in the lines. Which too will result in better braking.
-Chris
P.S.- Sorry for the long post, if its confusing let me know and I'll try to rephrase it.