When I have the exhaust brake engaged and come to a stop, it sounds as if the exhaust brake is still open allowing exhaust gasses to escape. This is the first time I noticed this.

Is this normal or should the exhaust brake shut when the truck is at a stop idling.

 

Was it still cold? Did you switch it off to see if the sound changed? Probably working normally. Good luck.

 

When it is cold out the EB will continue to operate even if you are at a stop. Once you accelerate it will stop.

 

Truck was at normal operating temp. As I dis-engage the exhaust brake the sounds goes away and returns when engaged? As I accelerate the sound goes away until I remove my foot from the accelerator.

 

Sounds like the engine wasn't up to full operating temp.

 

If the motor is up to full operating temp, it should not be on at idle. It only is on at idle when the motor is still cold. I'm not sure at what temp is shuts off at idle, but it is close to normal operating temp.