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Old 04-17-2014, 01:33 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, 07:19 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, 02:06 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, 02:49 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, 06:16 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, 07:14 PM   #16
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I have the ISB...350hp
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Old 04-18-2014, 07:19 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, 08:32 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, 10:35 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, 11:05 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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