I'm hoping to know what's going on with my 2006 chevy hhr.
My brakes hiss loudly unless I'm practically standing on the brake pedal, even for about 20 seconds after I take the key out.

Possibly related? I'm not real clued into new car workings, but my a/c won't turn on unless it's on full blast, and the engine light has been going on randomly. I thought I might try changing all the fuses, but I don't think it has anything to do with the weird hissing noise.

Hope someone can help.