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Old 02-14-2013, 09:55 PM   #85
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Alpine Owners Club
Join Date: Sep 2012
Location: Redding CA
Posts: 65
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

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Old 02-15-2013, 09:54 AM   #86
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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.


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