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Old 09-17-2020, 06:46 PM   #1
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2020 Allegro Red 37 PA diesel exhaust brake

Wondering if if this is normal or ???? We just purchased a 2020 Red 37PA and was concerned/confused about exactly how the exhaust brake should work. I understand how it works but I feel that this could be an issue if I'm right. It has the new freight liner chassis with the lever on the right side of the steering column which activates the diesel exhaust brake. We also have a tow vehicle with a invisa-brake system and had a small led light mounted on the dash that activates when we apply the brakes on the motor home to show us when the brakes are being applied on the toad. When I apply the diesel exhaust brake the small led light comes on and appears to be applying the toads brakes. Isn't this an engine retardation system that slows the rig without using any actual brakes or do I have this wrong? We were coming down the big hill on 395 on our way back from Mammoth and this happened with a smell of burning brakes. I was not applying the motor homes brakes at all. It really slowed us down but I don't think the rig should slow down at the toads expense. Maybe someone has had a similar issue or can answer why the tow vehicle brakes are being applied.
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Old 09-17-2020, 07:03 PM   #2
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Since the invisibrake is activated by the brake lights and from what I understand the exhaust brake activates the brake lights on the coach you are applying the toad brakes when you use the exhaust brake. I'm with you I don't think this is a good situation. It says you can adjust the invisibrake from 5 psi to 100 psi and that might solve your burning up the brakes issue but it also defeats the purpose of the supplemental braking system. Do the instructions say not to use it with exhaust brakes? I would be having a discussion with Roadmaster or whomever installed the unit to see what they say. Good luck
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Old 09-17-2020, 08:22 PM   #3
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Quote:
Originally Posted by GandC View Post
Wondering if if this is normal or ???? We just purchased a 2020 Red 37PA and was concerned/confused about exactly how the exhaust brake should work. I understand how it works but I feel that this could be an issue if I'm right. It has the new freight liner chassis with the lever on the right side of the steering column which activates the diesel exhaust brake. We also have a tow vehicle with a invisa-brake system and had a small led light mounted on the dash that activates when we apply the brakes on the motor home to show us when the brakes are being applied on the toad. When I apply the diesel exhaust brake the small led light comes on and appears to be applying the toads brakes. Isn't this an engine retardation system that slows the rig without using any actual brakes or do I have this wrong? We were coming down the big hill on 395 on our way back from Mammoth and this happened with a smell of burning brakes. I was not applying the motor homes brakes at all. It really slowed us down but I don't think the rig should slow down at the toads expense. Maybe someone has had a similar issue or can answer why the tow vehicle brakes are being applied.

Consider changing your toad braking system to either an air system or an inertia system. If the InvisiBrake is a brake light connection it is probably overheating the toad brakes when the engine brake is active. A system that connects to your air braking system on the MH is the best because it is proportional and won't be affected by the engine braking system tuning on the MH brake lights.
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Old 09-17-2020, 08:32 PM   #4
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The default setup for the exhaust brake is any time it's active the coach brake lights are on. You can have it reprogrammed so that the exhaust brake does not activate the brake lights.
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Old 09-17-2020, 09:03 PM   #5
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I new I would find an answer here. Thank you all. I wasn't aware that the InvisaBrake was brake light activated. This is our forth motor home with the other three all being gasers where this braking system worked well. I will contact RoadMaster to find a solution. Again, thanks for all the feed back.
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Old 09-18-2020, 09:42 AM   #6
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As Dan stated, the easiest solution is to have your Mh reprogrammed so the brake lights do not come on when the exhaust brake is activated.
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Old 09-18-2020, 01:27 PM   #7
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Thank you all. After a little digging, here is a little update. Contacted RoadMaster and was told by a tech that the InvisaBrake system turns itself off or releases the brakes 15 seconds after the exhaust brake has been applied. Could also reduce the braking pressure but still not real fuzzy and warm about that though. Then contacted Cummins and was told that you can go through the computer into the exhaust system and reprogram the brake lights to not activate when the exhaust brakes are applied. Must be done by a certified cummins center/mechanic or will void the warranty.
LT. Dan and Gary, you guys were right on the money. Better than having to buy a whole new system.
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Old 09-18-2020, 01:54 PM   #8
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Just donít be surprised when the Cummins shop hits you for an hour or more at MH rates which are around $150 an hour
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Old 09-18-2020, 04:20 PM   #9
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Just don’t be surprised when the Cummins shop hits you for an hour or more at MH rates which are around $150 an hour

To reprogram those brake lights takes all of 15 minutes, most of which is getting the computer hooked up to your coach. By the way, a Freightliner service center can also reprogram the brake lights and no it will not void your warranty. The Cummins guy was full of s**t on that.
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