Semi-Mettallic pads tend to squeak, they have improved over the years to reduce the squeeking, BUT, logically, if you buy cheap replacement semi-metallic pads, they are more likely to squeek then the higher quality pads that have better quality control and materials to help prevent the squeeking.
Many better quality pads include anti-squeel shims attached to the back of the pads, to reduce brake noise, cheaper pads will NOT have this extra, and they will likely make more noise.
The Commander has Ceramic Pads OEM, but don't be fooled, all brake pads are a formulation of all sorts of materials, and have always included metal, its just the semi-metallic pads were when they went to high levels of metal, ceramic pads have metal in them also, just not as much and they add a lot of the new ceramic materials.
Keep in mind, all the Dealers have started to stock aftermarket pads, so if you go to the dealer, more likely than NOT, you get aftermarket pads and NOT the same OEM pads put on during assembly of the vehicle.
Finally, when doing a brake job, cleanliness and attention to detail is important. Get dirt, grease or foreign debri between the pads and rotor and you can have problems and noise will likely result. The brakes have lube points that need to be cleaned and trued up with a file, and fresh hi-temp brake grease applied, this is NOT done, then it will create noise. The contacts points between the rotor and pads, often needs some sort of treatment, to help ensure against noise, and there is usually instructions per specific vehicle, brake system and pads as too what treatment should be used. You have to review FSM, instructions included with the Pads, etc. Sometimes its just a light layer of hi-temp grease, other times its a special silicon gel, and recently, I just got a set of pads that the instructions said the anti-squeel shim is actually performed by a layer of material backed into the back of the pad, that also improved cooling of the pads, and that they be installed totally dry on the contact points between pad and caliper.
If you missed any of that, you might want to go back and redo it. If you got a cheap set of pads, might want to get a better quality set and replace the cheapo's. Finally, if you still have squeeling, I'd get the silicon goop for brake pads, anti-noise stuff, and apply it on the back of the pads.
And finally still, if all else fails, I'd look at the rotors and consider replacing them. The modern pads heat up the rotors so much, its becoming more and more common now-a-days that rotors develop problems in their metallurgy and develop hard spots, etc, I've had happen to me, and it was a vibration, NOT noise though, and nothing worked, even turning the rotors, until I finally replaced the rotors and the problem suddenly disappeared.
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