Community Forums

Trek8288 · 12-23-2022, 02:56 PM

My last short drive for the weekend about 120 miles one way, (Monterey Ca); going down, awesome, great time. On way back the following evening, after dark, about 9:00, passing by Oakland California, middle lane of freeway I felt a hard like sudden brake action, (a transmission warning light came on). Then the motorhome continued on like nothing happened.

When we arrived where I keep the MH I turned it off while I opened the gate and got set up to pull it in. When I returned to start it and turned the key, absolutely nothing happened. I tried everything, shifting between gears etc. Nothing. It was done. I had electrical and a full battery and all lights worked great, just the starter. I called my friend, (owner of the shop I am at). He came out and tried, no go. Finally he crawled under and tapped on the starter with a hammer and it worked. Great. I ordered a new starter.

I have not installed the starter, but I have it. The Starter has functioned without fail since and no more codes or error messages on the dash.

Moving forward, that was a few weeks ago.

Today I took MH out and filled gas and propane, (we plan on using it this weekend. I went to gas station, pulled up, car at pump so I stopped and waited, turned off engine since it was apparent that he would be awhile. The person left so I started engine, put in gear, pushed in brake button, NOTHING...Autopark would not turn off..I attempted several times, no go. Here I am hanging out and blocking and it will not move/Autopark will not release. I pushed button in and out, no go. I turned off engine, waited a second. Re-Started; Put in gear, pushed in Autopark, it worked this time. Has worked and started as it should since.

Note:
I have replaced the Autopark Solenoids to be safe about a year ago. I purchased the from UltraRVparts.com Good products. (I am hoping).

Any advice or knowledge on this?

donr103 · 12-23-2022, 03:07 PM

Did you replace relay ? So for some reason I don't see make and model of your rv.. so if no one else can.. you need to post it..
Good luck and keep us posted

TandW · 12-23-2022, 03:14 PM

Sounds like your shifter assembly/cable has a fault, or is coming loose. Your initial "Braking action" complaint no doubt was the Autopark engaging at speed.
The shifter cable runs very close to the exhaust and the internal sheathing can seize the cable.
Pretty sure you changed out the pressure switches and not solenoids as you described.
You will need to sort this all out and be aware that your Autopark brake shoes have too little material on them even when new. If you had the Autopark engage while at great speed you will have to inspect the shoes and replace them if necessary.

David 70 · 12-23-2022, 03:15 PM

His profile says he has a 2000 Fleetwood Terra.
Check the switch on the transmission shifter. it has to make correct connection also in order to get the AAPB released. it may just need an adjustment.

Trek8288 · 12-23-2022, 03:42 PM

2002 Fleetwood Terra 32 P32 Workhorse Chassis 8.1 liter Engine GM Transmission

Yes I replaced the Relay, it came with the Solenoids

Trek8288 · 12-23-2022, 03:49 PM

Pressure Switches yes I keep saying solenoids

Trek8288 · 12-23-2022, 03:50 PM

Might you elaborate on the "Switch on the Transmission Shifter" please. Maybe it is something I might wish to replace.

Trek8288 · 12-23-2022, 03:53 PM

David: Are you speaking of the Ignition/starter Switch?

Trek8288 · 12-23-2022, 04:05 PM

Quote:

Originally Posted by David 70

His profile says he has a 2000 Fleetwood Terra.
Check the switch on the transmission shifter. it has to make correct connection also in order to get the AAPB released. it may just need an adjustment.

David: I you speaking of the Neutral Safety Switch?

David 70 · 12-24-2022, 07:28 AM

I know there is a switch on the transmission where the shifter goes in. That one has something to do with the AAPB. Any way on my 4L80E it does. I would imagine as long as you have the 4L85E it would have one also. I will see if I can find the info I have in my computer some where, It likes to hide my downloads on me.

donr103 · 12-24-2022, 07:45 AM

So I have never read here where ultra switches go bad.. but even if you changed the relay.. ultra still recommend every 5yrs to change the relay..
1st go under and check oil level and condition.. oil should be changed every 2 to 5yrs.. now yours could be up front.. they changed them back a forth I can never remember..
Next.. find a hill away from traffic.. see if holds on a hill.. forward and backwards.. do not trust it until you have done this.. until you get a chance to verify it holds chock all wheels .. TWINBOAT is correct.. telling you that brake shoes could be gone.. verify it holds.. don't trust until you do.. rv could roll and hurt someone..
Some members post here.. that there could be possible a relay up front.. on trans by neutral safety switch.. I still have not found mine..
Yes the actuator could be leaking.. so check for leaks.. then I hate the way they routed the cable at back of engine next to hot exhaust.. there could be a problem..
Install the genie lamp system.. see autopark.com.. also add the alarm for it..
Lastly.. if you have Vickers valve.. if dirty.. it might not be working right.. so if you got one.. clean it..
That is where I am for now..
Good luck and keep us posted

Trek8288 · 12-24-2022, 08:02 AM

Quote:

Originally Posted by David 70

I know there is a switch on the transmission where the shifter goes in. That one has something to do with the AAPB. Any way on my 4L80E it does. I would imagine as long as you have the 4L85E it would have one also. I will see if I can find the info I have in my computer some where, It likes to hide my downloads on me.

David: My transmission is a 4L80e also.
I FYI installed a deep aluminum pan with cooling ribs on it. Added 1 believe 4 quarts of fluid to it and much better cooling.

I will look into that switch. I believe that is the switch what threw to code and error message when my Automatic Park Brake acted up on the freeway

Trek8288 · 12-24-2022, 08:05 AM

Quote:

Originally Posted by donr103

So I have never read here where ultra switches go bad.. but even if you changed the relay.. ultra still recommend every 5yrs to change the relay..
1st go under and check oil level and condition.. oil should be changed every 2 to 5yrs.. now yours could be up front.. they changed them back a forth I can never remember..
Next.. find a hill away from traffic.. see if holds on a hill.. forward and backwards.. do not trust it until you have done this.. until you get a chance to verify it holds chock all wheels .. TWINBOAT is correct.. telling you that brake shoes could be gone.. verify it holds.. don't trust until you do.. rv could roll and hurt someone..
Some members post here.. that there could be possible a relay up front.. on trans by neutral safety switch.. I still have not found mine..
Yes the actuator could be leaking.. so check for leaks.. then I hate the way they routed the cable at back of engine next to hot exhaust.. there could be a problem..
Install the genie lamp system.. see autopark.com.. also add the alarm for it..
Lastly.. if you have Vickers valve.. if dirty.. it might not be working right.. so if you got one.. clean it..
That is where I am for now..
Good luck and keep us posted

donr103:

Will print your message and check each line.

Thank you

David 70 · 12-24-2022, 08:14 AM

The PARK/NEUTRAL POSITION SWITCH is located on the left side of the transmission near the middle. When the column shifter is in the park position, the switch is closed to supply current to the park/neutral relay, opening the circuit to the park brake motor switch and the solenoid valve. When the column shifter moves out of the park position, the switch opens. Once the circuit is open this allows the park/neutral relay to close providing B+ current to the park brake motor switch and the solenoid valve.

Here is more info on that switch. I will give you the web address for the entire info on the AAPB in a seperate post.
https://www.ultrarvproducts.com/inde...ormation_id=10

I did get it in here.