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Old 10-04-2014, 10:36 AM   #1
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J71/J72 Auto park alternate parts solution

While researching what to do if Auto park brake system loses hydraulic pressure, I came across another rv owner with workhorse, and they did manual brake system with parts from stepvanparts.com, substituting the inexpensive hand pull lever and cable for the expensive hydraulic complication. No photos or further details, any thoughts from you experieced rivits?
Being new at this, the stories of Auto park drama and expensive inconveinent repairs after towing, Just because the parking brake engages while driving seems crazy. My 2005 seems to be the j72, but if it engages from loss of pressure, now what?
Robert
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Old 10-04-2014, 01:57 PM   #2
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We removed all hydraulic parts / lines for the brake. Replaced shoes on driveshaft brake. Installed foot / cable / brake ...to driveshaft brake.

To park: depress foot brake to apply
To drive: depress foot brake to release

Holds mo ho PERIOD.....

Will install electric reminder to Apply. And release.

Did ourselves...easy.

Many pounds lighter...same cable / distance travel....to apply shoes at driveshaft.
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Old 10-05-2014, 01:15 AM   #3
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OK awesome

Great to hear it's possible. Might you be willing to share parts you needed, where you got the parts and a photo or two to help the rest of us. Any suggestions greatly appreciated. Thanks very much!
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Old 10-05-2014, 03:29 PM   #4
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Yes, of course. I'll try to compose a step by step.


Sent from my iPhone using Airstream Forums
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Old 10-06-2014, 09:18 AM   #5
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Airstream Land Yacht (officially 2003 per VIN) 30’ no slide out. Original owner.
PROBLEM: PARKING BRAKE DID NOT WORK. NO ‘LOCK UP’ ….JUST STOPPED HOLDING.
RESEARCH. DECIDED TO REMOVE ENTIRE SYSTEM AND REPLACE WITH A MECHANICAL SYSTEM. 30 X 70 BUILDING with cement floor. Placed large solid hardwood blocks about 18” x 18” x 6”under hydraulic levelers. Raised moho up to the limit of the levelers. Cribbing under the entire moho at frame areas with no vertical space. Large pads placed under all wheels. Studied the entire shoring and cribbing for any possible movement. All batteries disconnected, ends of battery cables enclosed and tied to safe areas. Much fluorescent lighting.

remove pin holding cable from hyd piston.
remove hyd piston, electric, hyd lines [covered lines]
support drive shaft, disconnect at trans brake bell, carefully move out of the way & tie off.
Remove brake bell to expose brake pads.

how do I add a photo?
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Old 10-07-2014, 10:56 AM   #6
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Photos

Great write up so far!
I believe to add photo, below the write up, go 'additional options' , 'attach files' . Select 'manage attachments' , 'upload files from my computer' , and then select the location on the computer (or device) and name of the photos and you will see the bar on the top of the window change. At the bottom, select 'close window' , when all the photos are added, then post normally. I just tried it with my tablet since we are on the road, and it seemed to work.
Thank you very, very much for sharing!!!

Robert
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Old 10-07-2014, 11:05 AM   #7
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May I chime in here? I do not have a moho, but I do have a history with the auto-apply park brake.

There are 2 reasons that it was used in the RV application: the weight of the larger units, when parked on a hill, will make it difficult to get out of park, unless the park brake is applied. If it were left up to the driver, many would not manually apply; the second reason...again, on the larger units, the parking pawl in the transmission may not be robust enough to prevent a fracture and subsequent roll away, again when parked on a hill.

If you are going to convert to a manual system, please install some kind of warning when the brake is not applied that is soooo irritating that any driver will be inclined to apply the park brake manually. Please think of the next owner who doesn't know any of this, as well.
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Old 10-07-2014, 12:15 PM   #8
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Thanks, good points. Question - if hydraulic failure, how are you going to get driving again without climbing underneath and pulling drive line to remove brake, and then put drive line together again? We go places where triple A, or tow is unlikely to be available. That is the reason I am asking how to save myself.
Thanks very much!
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Old 10-07-2014, 12:29 PM   #9
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There is no other way. FMVSS requires that automatically applied brakes must fail to the engaged position.

However, IIRC, (and I may not) the double nutted adjustment at the pump actuator may have enough adjustment in it to pull the brakes "off". I seem to recall there is another adjustment as well, in the cables/linkage. It's been 20 years.....and I don't have service manuals anymore.
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Old 10-08-2014, 05:15 PM   #10
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BRAKE SHOES: STANDARD ITEM, AVAILABLE AT MANY AUTO PARTS STORES,
NAPA # TS 228, 1 SET, $23.40 PLUS $7.00 CORE CHARGE WITH AAA DISCOUNT
NEED JUST 2 SHOES TO MATCH THE ORIGINAL, RETURNED THE UNUSED AND OLD SHOES…..TOTAL LESS THAN $ 25, …..MATCHED ORIGINAL INSTALL. . EASY CLEANUP AND INSTALL….TOOK PHOTOS BEFORE DISASSEMBLY TO ENSURE EXACT INSTALL.
CHECKED CABLE….LIKE NEW……PULLED IT BOTH WAYS, SLID VERY EASY. THEN INSTALLED CABLE………PULLED IT….SHOES MOVED EASY AND RETURNED EASY. ONLY NEEDED A LITTLE OVER 1 “FOR MAXIMUM HOLD POSITION. [BRAKE ‘ON’].
VERY LIGHT SAND INSIDE OF BRAKE BELL. INSTALL BRAKE BELL CAREFULLY.
WAITED TO RECONNECT DRIVE SHAFT TO ALLOW TEST ADJUSTMENT OF FINISHED MECHANICAL BRAKE RELEASE AND APPLIED STATUS. sorry, still trying to learn to post photo
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Old 10-08-2014, 05:30 PM   #11
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the posts I have sent describes the entire removal of the hyd auto park system.
this is not done 'on the road', or to be able to move a moho in an emergency.


in first post:Will install electric reminder to Apply. And release.

in a reply post:pulling drive line to remove brake........NO, this is in my post describing the entire removal of system and NOT to be done 'on the road'
sorry, if you thought otherwise.
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Old 10-09-2014, 11:20 AM   #12
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one more try to post photo
if this works it is the original install from the factory.

the brake shoes were replaced with exact size as mentioned in previous post. note the clean area of the brake bell...care not to touch.
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Old 10-10-2014, 12:36 PM   #13
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Thanks very much!

Excellent information, can't thank you enough for the description and the photo. Also found oldusedbear excellent Web site rvautopark.com with the trouble shooting and complete brake adjust process.
Thanks again for your expertise and sharing it, new shoes for Bella the bus, a spare rgs switch and a cable cutter and chocks for the emergency fix this trip.
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Old 10-11-2014, 04:40 AM   #14
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Bella123, do you have the parts number for the spare brake cable you ordered?

Sam
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