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IT COULD BE AN IDLER, TENSIONER, OR THE BELT SLIPPING, THESE ARE SEALED YOU CAN'T LUBE THEM. IT SOUNDS LIKE THE BELT IS SLIPPING, BUT IT COULD BE SLIPPING BECAUSE OF A FAULTY IDLER\TENSIONER. REMOVE THE BELT, MAKE SURE ENGINE IS SHUT OFF, AND YOU HAVE THE KEYS, ROTATE ALL THE PULLEY'S AND THE ALTERNATOR PULLEY THEY SHOULD ROTATE FREELY AND RUN TRUE, AND NO ROUGH FEEL TO THEM, OR THE TENSION COULD BE TOO WEEK TO KEEP THE BELT TIGHT.
My guess is a pully is going bad on the tensioner. The new belt had more grip so it was able to force the bad pully to turn but now that the new belt is a bit worn it's beginning to slide as the pully gets worse...Does tha make sense? Solution: Remove the belt and turn each pully by hand. The pully's should turn very easily without ANY struggle. If you find a pully that has any stiffness ...(Or is hard to turn).....thats the bad one. Replace the bad pully and you will be a happy camper
start by getting the thing lubed at your next oil change. take some armor-all with you and pay them some extra bucks to spray that stuff on all your bushings and shocks. if that does not help then you have to wait until the squeak gets worse and identifies itself.
there is nothing under the floor of the pedal will make that terrible squeak sound. have your belt check make sure they are tight and not slipping, it will also make that loud squeak sound if it slips. go to auto parts store and purchase a can of WD40 and spray it on all the pulley under the hood. have the engine off while spraying the pulleys. don't worry if it get on other parts of the engine. Common problems with pulleys squeaking on many vehicle.
The rollers behind the drum need heat resistant grease. You'll need snap ring pliers to remove them. Clean and inspect everything inside, vacuum all lint. Have a spare belt, they're cheap. Check the tensioner pulley for lube, but don't get any where the belt touches.