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Old 09-21-2019, 02:02 AM   #1
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Model: A.C.E. 27.2
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THOR #14698
Invisibrake failure

So we are tooling through the Cumberland Gap in Kentucky on our way to Smoky Mtn NP and my Invisibrake light for brakes on in towed car does not come on. Pull into a rest area and check the Invisibrake box. When MH brakes are applied the Invisibrake pump runs but produces no pressure. Cranked the pressure adjustment up and still no pressure. I think the brake controller pump is bad but Donít know for sure. Used the tow/haul liberally and made it into The Rv park in Tn. Any ideas on troubleshooting? I think the controller is toast and I will have to limp it home and have the dealer replace on Roadmasters dime. But we are open to ideas
Thx. Mark
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Old 09-21-2019, 08:54 AM   #2
gmc
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THOR #2829
Invisibrake failure

Some thoughts/questions..
If you start the toad, do you have power brakes or dead pedal?
The pump (vacuum, not pressure) is connected to the vehicles power brake system. A break in vacuum line would affect both Invisibrake and normal toad braking.
When connected as toad and RV brakes applied, does the toad brake pedal move?
The Invisibrake both applies vacuum to the power assist, and moves the pedal...
These may help narrow down the issue.
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Old 09-21-2019, 10:56 AM   #3
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THOR #14508
+1 on the vacuum lines. I'm in Townsend, just outside the Nat'l Park; if I can help in any way, let me know. Available later tomorrow (Sunday). mjrichaud @ gmail
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Old 09-21-2019, 12:22 PM   #4
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THOR #14698
The Invisibrake is connected to the Jeeps brake pedal via a cable . When the MH brakes are applied the vacuum pump pulls the cable and applies the brakes. The Invisibrake pump runs so it not an electrical issue and the Jeep brakes are fine on their own. There is an inches of vacuum pressure gauge on the box and when the unit is working it shows a reading, currently pump runs and reading is 0.
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Old 09-21-2019, 12:40 PM   #5
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THOR #14698
I am pretty well convinced it is an internal failure in the control units pump. Or possibly an internal vacuum line leak. As the system is still under factory warranty I won’t void that by opening the control unit. I was grasping at straws hoping I missed something in the diagnosis. With all the experienced RVr’s on here it is always worth putting a problem out there and seeing what others have gone through. Thank you GM for your quick response and thanks MRichaud for the offer of help. We are in Townsend as well maybe we should meet for coffee
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Old 09-21-2019, 01:17 PM   #6
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Sounds good - how long will you be staying?
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Old 09-21-2019, 01:46 PM   #7
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Til at least the middle of next week
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Old 09-21-2019, 01:51 PM   #8
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Great - will send my ph. # via PM.
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Old 10-04-2019, 09:50 PM   #9
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Update got the ACE and Cherokee home. Called the installing dealer and have an apt. end of October. As an FYI that tow/haul on the F53 chassis works as advertised. Tapped that brake pedal and the trans did the braking for us no untold stress on the coachís brakes all the way from East Tn to NW Indiana. Also this is our first Ford V10. Last C we had was on Chevy with a 6L. That one could barely get out of its own way. I was truly impressed with the Fordís ability to handle the load running the Appalachians. On the Chevy if you lost momentum and got pinned behind a truck that was it, put on the flashers and follow up the hill. This one tromp on it and the F53 and toad would move out strong. Not saying itís a race car but the V10 could accelerate with the 4500 lb toad up a hill. I was impressed. Safe travels. Mark
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Old 10-04-2019, 11:54 PM   #10
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Glad you made it home OK!
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