Exhaust brake not working
Cummins 400 isl 2006 travel supreme. About 90,000 miles. Need some help! Thanks
Forum Discussion
Probably need some clarification.
Cummins 400 HP generally means the Cummins ISL. The ISL could be ordered with either exhaust brake or engine compression brake (for more $$).
If Cummins ISC, it will have an exhaust brake.
Let's see how far into "engine brake is on" you get: Does the Allison shift pad change from "6" to the lower gear programmed as the engine brake pre-select?
What brand of exhaust brake do you have. If PacBrake, has it been lubricated:https://pacbrake.com/product/c18037-superlube/
And, very easy to verify if any type of engine brake is working: Use transmission down arrow to select a gear where you are close to the upper end of the RPM range. Turn engine brake on/off/on. Since the transmission is now a constant, easy to see if you have added braking HP.
Cummins 400 HP generally means the Cummins ISL. The ISL could be ordered with either exhaust brake or engine compression brake (for more $$).
If Cummins ISC, it will have an exhaust brake.
Let's see how far into "engine brake is on" you get: Does the Allison shift pad change from "6" to the lower gear programmed as the engine brake pre-select?
What brand of exhaust brake do you have. If PacBrake, has it been lubricated:https://pacbrake.com/product/c18037-superlube/
And, very easy to verify if any type of engine brake is working: Use transmission down arrow to select a gear where you are close to the upper end of the RPM range. Turn engine brake on/off/on. Since the transmission is now a constant, easy to see if you have added braking HP.
