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The first thing I would do is inspect the brakes. The brake pads have a metal indicator that will start to rub when the pads get low. It will make a really annoying high pitch squeal.
It could also be a condition known as metallic squeal. This would be a metallic particle in the brake pad that is causing the noise. Replacing the pads is a guaranteed fix for this.
It could also be a backing plate rubbing or any number of things.
Checking the brakes would be a good first step.
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Make sure the mechanic checked the park brake shoes inside the rear rotors, they quite often break away from the lining and get wedged in the rotor, sometimes causing a constant squeal noise. I've also seen the brake pad anti-rattle metal clips become loose and wander in the caliper bracket, they lightly rub against the rotor and cause a squealing noise similar to worn brake pads. They are also very bad for the backing plates rusting out prematurely and rubbing on the inside of the rotor. Other than that he can just try to champher the edges of both front and rear pads to help dissipate the brake dust, from collecting and causing squeak noises.
The squealing is from the pads rubbing back and forth against the piston, parts stores sell an anti squeal lube. As far as the even wear and the times changed, I would looking for non-functioning rear brakes. This can cause all braking to go to front, faster wear. Another check would be that the calipers and pistons are operating smoothly, a sticky piston can cause constant excessive pressure on pads and early failure.
One of the brake pads on one of the front brakes is probably wore out and rubbing metal to metal. Your rotor may be damaged to some extent. If it just started it may not be bad but you need to replace the brake pads.
if you had brakes and rotors 6 months ago,did you do just front or just rear? if you did front and squeal is in front,the new pads got hot and it glazed them,but the rotors are you pulsating pedal,are you sure they did rotors and pads? there is no way this should be happening in 6 months.
sounds like a wheeel bearing ..very common on this vehicle .or it may very well just be the splash plate behind the rotor rubbing against the rotor this is also common get on the ground ,using maby a length of cardboard so not to get real dirty and look to see if the splash guard is really rubbing if so bend it back out to correct the issue ..if not lift the vehicle off the groung and try moving the wheel from side to side and top to bottom wiggle it is there a lot of play ir is it tight if loose it will most likely be the wheel bearing going bad as well whomever replaced the brakes should have checked this out for youi if you described the problem to them
Pull the wheel,you will find that the brake pad,or after pulling the drum,the shoes are in bad shpe,if not ,check the wheel bearing,but my bet is the shoes,or pads are bad,do A brake job,it will most likely be the problem.
on disc brakes there is a metal marker on them that when the pads get low on material it will make a squeeling noise to let you know its time to change the pads.. so I would say you are in need of front pads also even though they look good you are getting low.. this marker is designed to let you know its time before you get to metal to metal .. jerry