strange sound

Is this normal? Or a sign of bad things to come ?

When my ac is running and I press the brakes a few seconds after releasing the brake it makes a grinding/whining sound. It only happens when the AC is running. The noise varies from 2-5 seconds at a time and can be heard even with the radio on. I have also noticed that the ac will randomly not...

I have been out of town for a few weeks and when I got back I jumped in my Jeep again. First thing I noticed was a sound that wasn't there before. It sounds like something is loose in the compartment in the rear and is moving around when I corner or stop and go. I checked but there's nothing...