My exhaust brake was working fine. I turned the truck off and started it a hour later and all I get is a clicking noise under the hood and it won't engage. The noise is clicking no matter if the exhaust brake is on or off. Will it hurt it too drive it 30 miles to the dealer. What do you think it could be? I have 76,000 miles and the ebrake has been on since about 25-30,000.