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Old 06-10-2019, 09:22 PM   #1
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No exhaust brake switch on 2002 HR Endeavor 38PST

I just recently purchased a 2002 Endeavor 38PST. I've been spending a lot of time in the coach getting familiar with all of the features. There's several things that show up in the manual that just aren't the same as what's in my rig. The one that's just frustrating the heck out of me is that I cannot find a switch for the exhaust brake. The manual shows it in the bank of switches on the left side of the drivers area, but I don't have one. I've also read that it is sometimes a pedal on the left side of the footwell. Not there either. I've got the original Spec sheet for this motorhome and it clearly says that there is an Exhaust Pac Brake. But I can't figure out where the switch to turn it off and on is located. Or if there even is a switch. Any thoughts would be appreciated.
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Old 06-11-2019, 07:19 AM   #2
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Are any of the switches on the drivers side console not labeled, maybe previous owner had to replace with generic switch.
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Old 06-11-2019, 11:57 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Congrats on the new rig! Hope you find that missing switch! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 06-12-2019, 11:33 AM   #4
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Yes there is one switch that has no label. I hadn't thought of that for some reason. Too busy figuring out what everything in the cockpit does!!

I'll check and see if that's that answer.
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Old 06-12-2019, 12:36 PM   #5
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Exhaust brake will not work with cruise control on.
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Old 06-12-2019, 04:05 PM   #6
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Quote:
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Exhaust brake will not work with cruise control on.
Mine does.
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Old 06-12-2019, 04:34 PM   #7
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I just recently purchased a 2002 Endeavor 38PST. I've been spending a lot of time in the coach getting familiar with all of the features. There's several things that show up in the manual that just aren't the same as what's in my rig. The one that's just frustrating the heck out of me is that I cannot find a switch for the exhaust brake. The manual shows it in the bank of switches on the left side of the drivers area, but I don't have one. I've also read that it is sometimes a pedal on the left side of the footwell. Not there either. I've got the original Spec sheet for this motorhome and it clearly says that there is an Exhaust Pac Brake. But I can't figure out where the switch to turn it off and on is located. Or if there even is a switch. Any thoughts would be appreciated.
Can we assume you have an Allison tranny?

Do you also see a lamp that you don't know what it is on the dash near the unknown switch? That could be part of the exhaust brake system - I say could because it depends on the switch installed and if a lamp is wired to it. The switch supplies 12V to a couple places when on and this enables the process of the exhaust brake which is controlled by the the transmission control module (TCM).
Once you find the switch and turn it on, usually there is some rules applied by the TCM - 1) the throttle position sensor tells the TCM whether your foot is pressing on the fuel pedal or not 2) once it knows your foot is on the pedal and you're moving more than 10mph the system is active 3)if you're moving over 10mph and you remove your foot from the pedal the tranny will seek a preset gear - mine seeks 2nd of 6. The rpm and engine speed will determine which gear the tranny actually starts using. If your tranny control has 2 columns at the top, you'll see that happening. 4) if you press the pedal again, you'll see the tranny seek 6th gear again and the right column will show you the progress toward it.
Turning the switch on the dash off stops all this.
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Old 06-12-2019, 08:23 PM   #8
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Yep it's an Allison tranny. I haven't noticed a lamp that I don't know what it does, but that doesn't mean it's not there. I'll check it out tomorrow and see what happens. Thanks for the info.
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Old 06-13-2019, 07:13 AM   #9
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Another thing to do is once you operate the switch: remember, if you're sitting still the PacBrake (PB) will not operate. Lift the bed (my engine is under the bed) and locate the PB - should be on the same exhaust pipe as the turbo. Then get someone to watch the PacBrake as you drive the coach getting above 10 mph - maybe 20. With the switch off, when you lift your foot off the pedal it won't do anything. Now flip the switch and lift your foot and you should here a hiss as the PB is activated. Have the person back there validate that it is operating. You also need to lube the flapper on the exhaust activated by PB and there is maintenance to be done on the PB itself also.
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File Type: pdf Maint L5300.pdf (109.5 KB, 4 views)
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Old 06-17-2019, 06:56 PM   #10
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Quote:
Originally Posted by Stonehands View Post
Hello



Saw this thread and have s question. I have a New to Us 2004 Fleetwood Bounder 35B Gas Class A.



My mechanic whom went through the unit said my model with the Allison 5speed tranny likely has a tow brake or what some call an exhaust brake. I have nothing that tells me I have this other than a switch on the driver left side counsel. There is a rocker switch with a pair of lights symbol showing I believe fog lamps however no fog lamps exist.



How can I test to see if I have a tow/exhaust brake.



Thank you


No exhaust brake on a gasser. Maybe a Grade Brake by Workhorse if that helps.
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Old 06-17-2019, 08:33 PM   #11
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Exhaust brake will not work with cruise control on.

Not true for everyone. It depends on how the coach manufacturer programmed it.
Even when using cruise, my Jake Brake will engage if the coach gets to 5 mph over the set cruise speed. When the speed drops back to the set speed, the Jake comes off and the throttle opens again.
This can be set to different speeds or it can be completely disabled...it just depends.
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Old 06-18-2019, 03:50 AM   #12
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No exhaust brake on a gasser. Maybe a Grade Brake by Workhorse if that helps.
Thank you. My mechanic didnít call it a Jake Brake or exhaust brake as I know those terms. Have my CDLA and drive a 53í er for years.

He called it a form of tranny brake with Allison.
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Old 06-18-2019, 04:11 AM   #13
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When I was in business we sold and installed exhaust and engine brakes. In most cases it was an accessory that the factory added to the chassis... sometimes it was the body builder and that was always a problem



1 - gas engines do not use exhaust brakes..
2 - some diesel engines based on their design can't use exhaust brakes because the exhaust valve springs don't have enough compression pressure (spring test) and will allow the exhaust valve to open under back pressure, thus not available
3 - the operation of the exhaust brake when interfaced with the ECM on the engine and the transmission is totally dependent on how the ENGINE and TRANSMISSION manufacturer programed those computers at the time of manufacturer... I've not seen a repair shop who could do nothing more than go into the ECM and either turn on the feature or turn it off.. no more or less.
4 - in some cases, the same engine and transmission 6 months apart in manufacturer date codes had different programs...


SO I ASK.... was an exhaust brake actually installed on your Endeavor... its usually located right behind the Turbo. If you have air brakes than air pressure activates through electric controls... if you have hydraulic brakes than the exhaust brake is either vacuum or air operated with a pump added to the system...


Any of the authorized dealers of either PacBrake (I was a major PacBrake distributor for 20 years) or Jacobs distributor can quickly check to see if one was installed.... and if so test, diagnosis and later repair...


We could test and diagnosis most installations in less than 30 min... often with a Pusher it was a fight to find the added wires in the wiring loom... unless it was installed by the chassis manufacture.... often we spent more time cleaning up the mess from the body builder who tried to install it and didn't do it right...



We didn't get paid for warranty work if the original installer failed to do a proper installation (60% of the time) and we told the customer up front about the problems...



We always took the customer for a test ride (TRAINING) on the proper use once the repair was made...



I hope this helps...
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