This happened with me, going both forwards and backwards. It was unbearable. I bought 3 different sets of pads for it only to go away for about a day or two. I finally bought some factory rotors and now it only squeeks going in reverse. I've used all sorts of different "brake silencer" goo...Next I"m going with a different brand of pads other than Toyota, probably the Hawks'...Any other ideas? Especially why it only does it in reverse? It was strange, the second the rotors were on, it continued it in reverse. It's not like it gradually came back..This is getting aggravating..