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Old 09-04-2015, 08:23 PM   #1
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2000 Rexhall Exhaust brake?

I just bought from a friend a 2000 Rexhal Aerbus. It was his dads and my friend does not know everything about it. So excited to take it out for an overnight adventure.

My question is when do you use the exhaust brake?



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Old 09-04-2015, 08:42 PM   #2
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Originally Posted by Brianinsocal View Post
I just bought from a friend a 2000 Rexhal Aerbus. It was his dads and my friend does not know everything about it. So excited to take it out for an overnight adventure.

My question is when do you use the exhaust brake?


Your exhaust brake is an alternative braking, that's done by the engine. It, in a nutshell, is a butterfly valve in the exhaust system. In order for it to work, there must be a couple of things in place.
1. Your foot basically must be almost completely off the throttle pedal. (you don't actually have to take it away from the pedal, just do not push on it)
2. The switch must be in the "ON" position
3. On some coaches, the cruise control must be off.

So, when you want to use it, this is basically how and when to use it, and, you'll learn how it works and then, adapt that knowledge to your particular desire.

You're coming down an off ramp on a freeway, long a head of time, you flip that switch on, (if it already isn't on) and, let off the throttle completely and, the valve will close off the exhaust flow in the exhaust system and, therefore it will build up back pressure in that section of the exhaust. When it does that, the engine has a hard time spinning over. That will, therefore, slow you down, without you using the brakes.

You're on approaching or, on a down grade in the mountains, county, or where ever and, you're starting to pickup speed. Again, make sure the switch is on and, just let off the throttle. The exhaust brake will take over braking. But, it's limited in its effectiveness so, be prepared to "assist" it, if the coach still picks up some speed.

That's the basics of how and when to use it. Now, after you've experienced it working a couple of times, you can now determine just when YOU would like it to work and just how much it helps you. Good luck.

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Old 09-05-2015, 06:55 AM   #3
Join Date: Oct 2010
Posts: 58
On mine cummins ISB 2004 it is a combination of tansmission and and moving of turbo vanes(variable geometry turbo).I leave it on all the time as it exercises the turbo vanes(so cummins says).I shut it off sometimes in city driving .

Sometimes I have to just touch the brake to activate it.

Just drive it and experiment with it . dave
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brake, rexhall

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