update on noise~~HELP!
So I've posted on this noise before. Its a faint rattle that is coming from behind the dash. It sounds like someones shaking a ping pong ball inside a soda can. Sometimes you can hear it, sometimes you cant. Its been getting colder lately and its getting louder. It seems to be coming from right behind the dash on the drivers side. I can hear it most when i shut the truck off. It seems like it rattles for a split second after the truck shuts off and thats about the only time I can hear it well enough to tell where its coming from. If i stick my head down by the fuse panel and shut it off I cant hear it. If i stick my head by the master cylinder under the hood and have someone shut it off i cant really hear it. I hear it best when i stick my head by the gauges and listen and kill the motor. Heres the new development. It rattles as im driving and when i come to a stop it continues to rattle. The colder the engine the more it rattles. If I push down on the brake hard while im stopped, the noise stops. When i lighten up a bit, it rattles. If i keep pushing down hard, and letting up the noise stops and starts every time i let up on the brake. Any idea? could it be the brake booster? master cylinder? could it be the brake at all and when i mash hard on the brake could it just be putting a load on the engine that stops the rattle?