Weird metallic rattle (occasionally)

Englishmandan

So when I'm driving with the windows down, I can hear a slight metallic rattle when I'm passing parked cars or driving next to a guide rail etc.... Coming from the passenger side

It will go away if I touch the brakes real quick, but does come back after a few minutes.

It's tricky to explain but if I were to describe it, it sounds like two washers rattling together. Obviously that's not what it is, but that's the most accurate thing I can think of that would make a similar sound.

I initially thought maybe I had something stuck in the brake pad as it goes away when I tap the brakes, but it's still there after a couple of days.

Any thoughts from the team?

Thanks in advance..