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Old 07-04-2013, 10:02 PM   #43
Junior Member
Join Date: Mar 2010
Location: Montrose, Colorado
Posts: 14
Hey there,

Guess what, my emergency brake failure is finally fixed, I brought it home yesterday. It took me two years and my mechanic a month. With my help finding out how to get the part. It never did totally lock up but warning alarms and pressure failure became constant warnings in the end.

It was defintely the roto-chamber. The Haldex, (OWABMAXI-H), roto-chamber/spring chamber/parking brake chamber, what ever name would be the most appropriate, ended up costing me $183.75 to have it rebuilt and $37.00 for shipping. This was done through Colton Truck Supply here in Montrose CO. My mechanic charged me $236.93 for labor and with tax, the whole charge came out to $466.22. My extended warranty, (American Guardian Warranty), was extremely picky as exspected. They didn't want to pay for the shipping on the rebuilt part, but my machanic convince them to do so and they only paid about 63% of the rebuild cost. Otherwise, my out of pocket was $177.79. I am happy with that. Its just to bad that the major truck repair facility in Grand Junction CO, not to be named, couldn't fix it last summer after they had it for over a month and a half.

Again, Thank You All, for your assistance and I hope anyone else who may have the same or similar problem can use this information to help them resolve their problem. The pictures provided by OLD FORESTER and Gary Arnold are the exact same part as mine.

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Old 07-05-2013, 10:06 AM   #44
Senior Member
Join Date: May 2006
Location: Washington State
Posts: 866

I'm pleased to hear it's fixed and working properly! It's a big relief when you don't have those warning buzzers and low pressure issues going off. I had to drive our coach about 3 miles to the place that finally fixed it in Georgetown, TX, with the both going off the whole trip, and it wasn't comfortable.

I installed an air pressure gauge the simple way -- just screwed a gauge into the valved port below the external air chuck where it says to drain moisture, and used it to check the pressure to make sure it was working. I could have plumbed in a tee fitting so the valve worked to blow out moisture, but I had already installed a pull-type drain valve like truckers use, on the bottom of the air tank to drain the moisture directly from the tank. Routed that pull-type cable to the side of the coach in front of the rear axle to make it easy to give the tank a quick drain.

Having the gauge outside the coach at the air chuck means having to be outside to look at it, and not having it at the dash, but it's easy to do, and serves a back-up check for the air pressure if you're curious, and to give another check in case you get an alarm or low pressure warning.

Former Owner, 2006 36MDDS
2010 Arctic Fox 22GK Travel Trailer
2007 Toyota Tundra
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Old 05-07-2014, 04:42 PM   #45
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Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,172
Due to recent time-difficulty in ordering the parking brake rebuild kit, Haldex p/n MQ15708, i.e. it takes a >2 months, I ordered two. Vagabondwater will have these available, you can PM me for the details if you need one. Its ridiculous to have to wait 75 days for a parking brake kit while a coach is sidelined.
Here is a pic of the kit:

The kit comes minus the Swiss Army knife, plus a tube of Super Lube PTFE synthetic silicone based grease. O-ring at bottom right is ~1/4" thick Buna material, ~5/8" thick felt wiper o-ring is at bottom left. Upper left is keeper ring, also ~1/4" thick, 1/4-round in cross section and made of hard plastic. Fitting in middle of keeper ring is hard plastic, ~3/4" high (you are looking down the barrel so to speak) w/some topography along the base. Applying this rebuild kit is within a well heeled DIY'er scope, you need a press or another containment system for the heavy spring inside the chamber. Getting the chamber in & out of the rig is a bigger struggle than the bench work.

Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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