Forum Discussion

supercub's avatar
supercub
Explorer
Dec 18, 2014

Exhaust Brake Usage??

When descending a grade where you're using your exhaust brake, once slowed, to below your desired speed, do you turn off the the exhaust brake and accelerate and then turn it back on......or do you leave it on, and use the throttle to accelerate a little. I was just descending a 6% grade, had the exhaust brake on......and slowed to below 55mph and it's still slowing....I usually turn off the exhaust brake and let it accelerate up to 60 or so, then turn it back on.......but was wondering if I should leave it on and use the accelerator. What's best? Pros and cons? does it matter which you use? Thanks
Brian

14 Replies

  • And, I do the opposite in the mountains-- I use the switch to turn it on/off as needed.

    When the throttle is closed, you are using ZERO fuel. Using the throttle to turn off the exhaust brake works fine, but uses some fuel to do it.

    Agree, in stop and go traffic, I leave it on and use the throttle.

    Either method works and is fine as far as the machinery.
  • supercub wrote:
    When descending a grade where you're using your exhaust brake, once slowed, to below your desired speed, do you turn off the the exhaust brake and accelerate and then turn it back on......or do you leave it on, and use the throttle to accelerate a little. I was just descending a 6% grade, had the exhaust brake on......and slowed to below 55mph and it's still slowing....I usually turn off the exhaust brake and let it accelerate up to 60 or so, then turn it back on.......but was wondering if I should leave it on and use the accelerator. What's best? Pros and cons? does it matter which you use? Thanks
    Brian


    I leave my exhaust brake all the time. Around town, I figure it saves wear on my brakes.
  • "supercub".....The down side of an exhaust brake is that you can't regulate the downhill speed. When I had my Diplomat, I left the exhaust brake on and if my speed got too slow, I just gave it a little throttle.

    An exhaust brake can be set to a couple of different configurations. Originally, on my Diplomat, the exhaust brake was on if the switch was on and my foot was off the throttle. I later had a computer change done so that when the switch was on, my exhaust brake didn't engage unless I stepped on the brake pedal. When going down a grade, this allowed me to tap the throttle, which would disengage the exhaust brake and the coach would coast. This seemed to make it easier to manage grades. This change is done in the ECM, but not all years can be changed.
  • With my rv the exhaust brake is rarely turned off. It disengages below a certain speed.