2000 Dodge Neon belt tensioner noise or brake pad noise?

Recently, I've been hearing a loud, annoying squeking noise everytime I break. My mechanic checked all my break pads and they're all still ok. About 75% he says. He changed the timing belt and told me we need to change the belt tensioner. So, is the sound coming from the "dysfunctional" tensioner? Unfortunately, we haven't found a mechanical belt tensioner except from the dealer which is obviously overpriced. Another mechanic told me it doesn't need to be changed. Now, I'm confused. By the way, my neon is a chrysler if that's significant at all.