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A grinding or rumbling noise can also be symptoms of a wheel bearing or constant velocity joint in a driveshaft. A worn wheel bearing can also cause a 'whistling' sound (as can a worn CV joint).
A grinding noise with brakes is either worn pads causing metal to metal contact on the brake disk/rotor, or the brake backing plate catching on a spinning rotor ... or a loose/missing anti squeal brake shim (they stop the pads from rattling and vibrating).
However, as you say a mechanic has looked at the brakes and can't find anything wrong .. I think I would begin to suspect a wheel bearing or constant velocity joint on the driveshaft (front wheel drive cars).
Kia is bad with wheel bearings ;.About 80 to 100k they start going bad. You have to check them physically with a dial gauge or know how to inspect them in other manners. They cause a rumbling sound when they start to go bad.
I would have the front wheel bearing adjustment checked first as if they are loose the rotor will be rubbing on the pads and the vibration will be wheel wobbling on the loose bearings Unless you replaced the bearings with new ones then they will fail especially if the adjustment was too tight and too much grease was used.
Is it a tire squeal or brake squeal?If it is brake squeal put high temp synthetic brake lube grease behind the brake pads to reduce/remove the brake squeal.This allows the pads to sit on a bed of grease and will not vibrate at the frequency which produces the squeal.
you have an issue with a front tire more than likely. or could be the front rotor. I would bet my last breath its' tire or break/rotor related. Maybe even a wheel bearing but it usually doesn't cause vibration in steering wheel.
I would guess your two issues are separate. The squealing belt could be an adjustment problem or a wet or damaged belt. Belts can vary, how long they last. I have replaced them the next year on some cars and others could 3 or 4 years. The tire vibration could be related to the tire tread or some type of tire defect(a bubble in the side wall), may be an alignment problem. Check the steering components, tie-rods, ball joints, and wheel bearings.
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