My brakes have been squealing for months. I had some Japanese aftermarket pads in which were quite loud so I went back to Toyota ones. Well the noise kept getting louder and louder, especially at low speed.
The noise was ear piercing, at lights I'd get dirty looks and people would wind up their windows
After two attempts I have fixed it. Removed all the pads front and rear, cleaned the calipers and cleaned the pads (again). Lubed and installed. Then noticed that I had the clip that pushes the pads forward on backwards.
DAMN!!!
The clip held the pads backwards so that when braking they would vibrate back and scream. Amazing such a simple error could make so much noise.
Wasted a whole afternoon. At least my wheels are sparkling clean now.