Rotational squeaks most often come from brake pads to rotors. If it stops or greatly changes when applying the brakes, this confirms it and CFM is legendary for squeaking brakes. Sanding and adding chamfers to the leading and trailing edges as well as anti-squeak to the pad backs helps. Making sure the slides are free and that the brakes are fully released is also something to check. Other causes of rotational squeaks are wheel bearings and in some cases, CV joints and their boots. Non-rotational, or squeaking that happens while riding and just working the suspension is most often from dry shock eyes or ends. Of course dry a-arms can also squeak.