Exhaust or jake brake or neither?

First, you always want to go downhill in the same gear as you climbed the hill. Most pacbrakes do not engage until you are down around 40 mph and the transmission in 4th gear - at least that is for us. Start going down by slowing down to 40 or less (depending upon how step the down side is - - use the signs as an indication of how slow you need to be) and engage the brake and take your foot of the brake and let her walk down. If the speed picks up, use the vehicle brakes to slow back down, then release them and let the pacbrake do its job. And remember you can always shift down another gear (slow down first, then shift) if you feel you are going to fast.

Barb