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Old 09-19-2016, 09:55 AM   #1
Nadge's Avatar
Join Date: Feb 2015
Posts: 37
Emergency brake and power assist dash lights illuminate

How do you trouble shoot two related trouble dash light issues?
Emergency brake light and the power assist brake light?

History of on and off, dash brake warning lights.

While driving my 2013 Allegro 36 la gasoline RV, the emergency brake light illuminated along with the power brake assist light.

According to the manual, it warns not to drive the vehicle.

Checking all related fuses for the brake system found no blown fuses.
Brake fluid reservoir level normal, no external fluid leaks around brake cylinders etc.

Shutting off the ignition and putting the ignition in accessory position all trouble lights illuminated temporarily and extinguished as normal (emergency brake wasnít applied during this test).

Testing the brakes while the two lights were illuminated, revealed no soft or hard braking issues.

Turning off and then starting the engine once more resulted in the two lights extinguished. ( Long story short, about trying to find assistance ANYWHERE, while in trouble, proved fruitless and a VERY cautious long ride North).
Driving the next 1800 miles to home resulted in no two dash light issues occurring.

Once home, I took the RV for error code testing and none revealed.

Two trips and 1100 miles later, the two lights once again illuminated.

Further observations and various rudimentary tests follows.

When driving, I have my headlights on. When the two lights came on, I noticed my left turn directional blinked slowly when used and the rear bulbs were dimly lit, while the right turn blinked and illuminated normally. When I turned off the headlights, the left directional blinked normally and the signal bulbs illuminated correctly even with the two dash lights illuminated.

Presuming the headlight switch was faulty, I replaced the headlight switch with new ($160) and no change. The two dash lights come on and go out when ignition turned off and at some point, as explained below, come back on.

If I leave the headlight switch off, while driving, the two lights didnít come on for the 100 mile test I tried. Directional lights worked properly.
When I turn on the headlight or select parking light position, while driving, the two lights donít illuminate until I utilize the left or right directional, not immediately but within a short period of time, the two brake related lights illuminate and the left directional repeats the slow flashing while the right flashes properly when selected. Once again, a long cautious ride home.

So, I reach out to whomever has had this experience and request how you corrected the issue please.

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Old 09-19-2016, 01:26 PM   #2
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Workhorse Chassis Owner
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Location: Pacific Northwest or SoCal
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I presume you have a Ford F53 chassis? While I am not positive, willing to say your hydro boost has failed, you not have powr brakes. If this was a Workhorse chassis the pump pressure would come from the power steering system, not sure on Ford, but apossibility.


Fred and Bonnie
2005 Dolphin LX 6375
Abby, Ruffles & Scarlett, "The Cats"
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Old 09-21-2016, 11:17 AM   #3
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Location: outside Duluth Mn
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There is a real strong possibility that your problem is in the left rear light. Think about the symptoms:
Originally Posted by Nadge
I noticed my left turn directional blinked slowly when used and the rear bulbs were dimly lit, while the right turn blinked and illuminated normally. When I turned off the headlights, the left directional blinked normally and the signal bulbs illuminated correctly even with the two dash lights illuminated.
That indicates a poor ground connection for the tail/brake light assembly. With the headlights off the turn signal is able to ground through the tail light circuit. When the lights are on the turn signal cannot use that path for a ground. You are going to need to look at the wiring (probably pull the light apart) and look for the ground and clean up all the connections you can.
1996 Dodge CTD auto, #100 fuel plate,advanced timing,upgraded turbo, 2006 Dutchmen 28' 5th wheel with a 12' slide out and 16' boat behind it all
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Old 09-22-2016, 01:42 PM   #4
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Bad grounds can do all kinds of odd things.
2013 Bullet 284RLS
2012 Silverado 5.3 4x4 w/ tow package
Husky Centerline
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Old 09-22-2016, 02:35 PM   #5
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Agree with a ground issue. Pull the tail light and get a alligator clip, jumper and ground it, while it's acting strange.
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Old 10-12-2016, 07:43 PM   #6
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Join Date: Feb 2015
Posts: 37
I sent a request to Tiffin Technical department and this was the reply and correct solution.

This is a known programming issue with the Ford chassis, with it being a programming issue you can drive to a repair facility. I have attached the repair notice and contact information to our Ford rep if there are any questions. You will need to take the coach in to a Ford dealership and give them this repair number so they can reprogram the system.
Repair released this morning TSB 16-0042.

Thank you Mr Tiffin for your Technical department and your parts department for their prompt response to my various requests.

Bob Bobak

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brake, dash, light, lights, power

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