I left work really late last night, and while driving home as one of the only couple of cars on the road I noticed when I apply my brakes, I can hear a very faint hissing noise under or in my dash someplace. I moved my hand around down there and didn't feel any air. The engine doesn't stumble or cut out of anything, but the hissing does increase the harder I step on the brake.
I never noticed it before, but I was curious if this is normal. It may be, the brakes work fine, I don't notice anything different about them. Do you guys have this too? What should I check?
There was a thread a year or more ago about a similar problem, I remember the guy had a column shift car and he could hear a wind leak or a hissing or something from under his dash, but I can't find the thread. I think he figured it out. Can't find it, maybe it was deleted.