Thanks. No snakes in Hawaii. Sounds like air hissing, no fluid on the ground and my tires are in perfect condition. I'm not a super savy car person but does the brakes and brake lines have or might be connected to the hissing and grinding?

When my car is on I noticed a hissing sound I can hear under the backside. Not sure if anyone ever talked about this but if someone could please help. Not sure if this means anything but the brakes when depressed sound like there grinding but only when I start my car and leave my driveway after that...