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univmd's avatar
univmd
Explorer
Jun 20, 2015

How do you know if your exhaust brake is working?

How do you know if your exhaust brake is working?

It seems my exhaust brake is not stopping the coach as much as it used to. The transmission will still downshift & rpm goes up upon activation of the exhaust brake button, does this mean the exhaust brake is really working too? how to tell if exhaust brake mechanism is really working too?

With warm regards, James

Cummins ISC 360 8.3 engine
Class A
  • eheading's avatar
    eheading
    Explorer
    Jun 21, 2015
    I agree with Brett. I always check our exhaust brake (and our new variable vane turbo brake) as he said. You can feel the brake take effect when you turn the switch, and let up when the switch is turned off. We have had 3 motorhomes with PAC brakes, and our new one has the variable vane turbo. They all "feel" the same to me and as far as I can tell are equally effective. But Brett's process is the only way I know sitting in the driver's seat that the brake is working or not.

    Ed Headington
    2013 Cummins 6.7 ISB engine

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