2002 Ford Explorer Question: I have a Squeaking /squeal coming from rear passenger side tire what is it?

Remove the caliper and inspect the brake pads to make sure the squeeler or brake shims are properly located. I think the disc is kept firmly in place by the lug nuts put them on and see if the disc is now "locked in place". Make sure the dust shield in the back of the disc is not damaged and rubbing. Could be a bad wheel bearing or even emergency brake shoes return springs. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online