BAC Forum

General Boards => Technical Support => Topic started by: Mike Nunn on August 06, 2013, 04:44:46 AM

Title: Exhaust brake
Post by: Mike Nunn on August 06, 2013, 04:44:46 AM

Is there any danger in the engine reaching too high rpm's with the use of the exhaust brake?  Should the coach be slowed to a certain speed before engaging the exhaust brake?

Title: Re: Exhaust brake
Post by: David T. Richelderfer on August 06, 2013, 05:48:51 AM

There have been numerous discussions on this forum about your question... and recently again, I might add.  If you do a search, then you should find most of the related threads.

Here is the most recent discussion:  http://forum.bacrallies.com/m-1374847063/s-12/highlight-exhaust+brake/#num12

I found a truck shop in Pasco, Washington that will reprogram the transmission software to allow the Jake Brake to operate in the higher gears and, importantly, not force a gear reduction from 6th to 4th or 5th to 4th.  My brother had his reprogrammed last week, and I plan to have mine reprogrammed this week.  Cost is one hour minimum shop time... or about $100, more or less depending upon the shop's rate.

Title: Re: Exhaust brake
Post by: Joel Ashley on August 06, 2013, 06:02:42 AM

As your reading of the threads David refers to will reveal, Mike, your diesel's system is programmed to protect itself in several ways, including over-revving.

Joel