Brakes

Hey I was wondering can anyone tell me why when I brake hard or in the rain my brakes make a weird sound. I have ABS on my 99 Cav. and when the abs kicks in and release I get this sound that sounds like some one grabbing a metal pipe that is fixed to something and pulling it back and letting go. Sorta like a twang. It doesn't happen all the time thou. I try and make it happen to show people and it won't or they say they didn't hear it. Can anyone help out??

isn't that how abs sorta works?

isn't that how abs sorta works?
indeed it is

I agree that is how it works but I have never had that sound on any other car I have ever owned with ABS and I have tested it out with other Cav of the same year. They don't make the same noise.