Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 02-14-2013, 09:55 PM   #85
casper124's Avatar
Alpine Owners Club
Join Date: Sep 2012
Location: Redding CA
Posts: 70
I to had a simular problem last month in which I couldn't build enough pressure to get alarm to shut off. Mechanic found on my 06 Apex the desiccant was in need of replacement,also, there is a parking brake "pup" that is apparently on the dryer or at least thats what was explained to me. It contains a piston inside it and the "O" ring on the piston will deteriorate with time and lack of use thus allowing air to escape. I'm thinking that this was associated with the freezing temps we were experiencing at the time that may also contributed to "O" ring failure.

The mechanic at first thought the whole "pup" assembly needed to be replaced at a cost of over $400.00, but, then he spoke to a company rep who said the "O" rings constantly fail and only need to be replaced to solve problem, which it did for us.

Hope this may help and good luck.

06 Apex

casper124 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 02-15-2013, 09:54 AM   #86
Senior Member
Join Date: May 2006
Location: Washington State
Posts: 866

I don't remember a "pup" on the parking brake assembly, but I do remember the quick release valve, which I believe releases the air pressure on the parking brake assembly, which we replaced, that I believe had an o-ring assembly. Perhaps that's what the mechanic was talking about. That didn't solve our problem, but it's what the mechanics tried first, because they initially thought that was the problem.

In any case, I'm glad that solved your problem. Ours was a leak between the outer case and the inner assembly on the rotochamber, letting air escape.

BTW, here's a link to a cross-section view of a rotochamber from Bendix website. If you look at it, you can see the inner and outer diaphragms, and the spring. Air is inserted between the inner and outer diaphragms and compresses the spring, releasing pressure on the parking brake, so the driveshaft can turn. When the air is released, the spring pulls the yoke assembly and applies pressure to the parking brake drum, which stops the driveshaft from turning via braking action. That's why the parking brake is spring-loaded on and air pressure applied to take the brake off.


Former Owner, 2006 36MDDS
2010 Arctic Fox 22GK Travel Trailer
2007 Toyota Tundra
OldForester is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Jetco Air Suspension System billr30656 MH-General Discussions & Problems 7 11-01-2009 04:57 AM
Air suspension slow to dump? Here's how to clean the valves Darryl MH-General Discussions & Problems 4 10-16-2007 03:25 AM
Air Suspension on a Spring chassis? jlb77399 Class A Motorhome Discussions 2 06-22-2006 12:03 AM
Adding an Air Suspension System bbarry Workhorse and Chevrolet Chassis Motorhome Forum 14 04-18-2005 12:03 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:22 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.