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Old 04-16-2014, 10:31 PM   #1
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Engine Brake Question

My engine brake switch has two positions - the rocker switch can be pushed from top and bottom.... Almost like position 1 and position 2...

What's the difference??? Come on
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Old 04-16-2014, 10:59 PM   #2
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Usually high and low setting.
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Old 04-17-2014, 06:41 AM   #3
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In the case if my 2011 340RB it is off and on.



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Old 04-17-2014, 07:31 AM   #4
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My 2008 is off / on as well
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Old 04-17-2014, 08:05 AM   #5
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Same here on my 14, off or on. When in the city, hills or traffic I leave it on to save my brakes, but when I'm on the interstate I leave it off because if I take my foot off the gas or go down a hill it shifts down a gear and RPM'S go up and I lose momentum...
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Old 04-17-2014, 08:53 AM   #6
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My switch is a rocker switch - off is in middle position, then I can push it on by either pushing on the top or bottom... Not sure why it would require a rocker switch instead of a simple on/off switch...
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Old 04-17-2014, 08:54 AM   #7
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Originally Posted by JTN8 View Post
Same here on my 14, off or on. When in the city, hills or traffic I leave it on to save my brakes, but when I'm on the interstate I leave it off because if I take my foot off the gas or go down a hill it shifts down a gear and RPM'S go up and I lose momentum...

X2! Same here.
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Old 04-17-2014, 09:34 AM   #8
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My switch is a rocker switch - off is in middle position, then I can push it on by either pushing on the top or bottom... Not sure why it would require a rocker switch instead of a simple on/off switch...

Do you have the Mercedes motor?



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Old 04-17-2014, 09:40 AM   #9
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Yes I do and it's great....
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Old 04-17-2014, 09:43 AM   #10
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In large tractors (18 wheeler) they have a 2 position switch for high and low engine brake or if you like to think of it differently partial jake and full. Not sure if your system is set up the same or maybe pre-wired for 2 with an option to upgrade..?
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Old 04-17-2014, 12:33 PM   #11
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Yes I do and it's great....

That's why your break is different. The Cummins don't have a true exhaust break.



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Old 04-18-2014, 06:19 AM   #12
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The Mercedes has a two stage engine brake. High and low. Nice feature and as Phil57 said, Mercedes has a true engine brake that is much more effective than the Cummins.
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Old 04-18-2014, 01:06 PM   #13
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In large tractors (18 wheeler) they have a 2 position switch for high and low engine brake or if you like to think of it differently partial jake and full. Not sure if your system is set up the same or maybe pre-wired for 2 with an option to upgrade..?
X2+ The some Volvos can have as many as six positions. Each position brings in an extra cylinder. VERY fancy, no??

Boowho??
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Old 04-18-2014, 01:49 PM   #14
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Engine Brake Question

So my "Engine Brake" switch is really an exhaust brake? (2008 Berkshire 390bh-50)
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Old 04-18-2014, 05:16 PM   #15
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So my "Engine Brake" switch is really an exhaust brake? (2008 Berkshire 390bh-50)

Hard to tell. What engine do you have.



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Old 04-18-2014, 06:14 PM   #16
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I have the ISB...350hp
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Old 04-18-2014, 06:19 PM   #17
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https://www.google.com/webhp?tab=ww&...b+engine+brake

Looks like it might be a Jake.
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Old 04-18-2014, 07:32 PM   #18
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So my "Engine Brake" switch is really an exhaust brake? (2008 Berkshire 390bh-50)
Yes, in a matter of speaking. The system used on the cummins ISB's is controlled by the turbocharger. Probably best to google it for the technical explination on how it works. Pretty innovative system but is a lower cost alternative to a true engine brake.
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Old 04-19-2014, 09:35 AM   #19
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It's also quieter than a Jake brake so you can use it in places where exhaust brakes are prohibited by law.

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Old 04-19-2014, 10:05 AM   #20
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It's also quieter than a Jake brake so you can use it in places where exhaust brakes are prohibited by law.

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"normally" engine brakes are prohibbitted not "exhaust" brakes.

Exhaust brakes retard power in a diesel engine, but in an different way than engine brakes. Engine brakes release compressed air through an exhaust valve, but exhaust brakes hold the compression in the engine and slow the crankshaft's rotation, which reduces vehicle speed
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