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Old 09-20-2021, 04:01 PM   #1
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Pure Air Plus air dryers

My 97 Discovery has a Pure Air Plus air dryer that doesn't work. I'm thinking about converting over to a AD9. I just don't like the looks of the Pure Air. AD9's I am familiar with and have serviced and installed many of them. Parts are more available and cheaper. Has anyone done this conversion?
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Old 09-23-2021, 01:25 PM   #2
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What do you think is wrong with the Pure Air Plus besides "it doesn't work"? There are all sorts or rebuild kits for it from filter to total rebuild, and I always found it easy to work on. There are remanufactured units also.

FYI, my 2006 Freightliner coach came with the Haldex PURest air dryer. Again, it is relatively easy to change the filter once I get it removed from the Ridiculous place where they hid it in my coach.

I'm not familiar with the Bendex Ad9
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Old 09-23-2021, 03:02 PM   #3
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What do you think is wrong with the Pure Air Plus besides "it doesn't work"? There are all sorts or rebuild kits for it from filter to total rebuild, and I always found it easy to work on. There are remanufactured units also.

FYI, my 2006 Freightliner coach came with the Haldex PURest air dryer. Again, it is relatively easy to change the filter once I get it removed from the Ridiculous place where they hid it in my coach.

I'm not familiar with the Bendex Ad9
The parts for a pure air are priced crazy. They want anywhere from $400-$600 for a new complete unit. I just ordered a AD9 with all new brackets for $150, AND i know the AD9 is a better dryer. Bendix has always made a far superior product than Haldex. Easier to find parts, cheaper, and like I said.......just a better product.
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Old 10-02-2021, 06:31 PM   #4
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I installed the Bendix AD9 air dryer In the RV. It installed very easy and was a good retro fit. All the fittings changed over and just had to get a bushing to enlarge the governor line. I'm also installing a new governor. Will test system and get back to you.
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Old 10-02-2021, 07:08 PM   #5
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Way to go! Hope it works better than the one you had.
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Old 10-03-2021, 01:25 PM   #6
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Went around the whole RV with soapy water and found a few minor air leaks, corrected most. Have a leveling valve at right front wheel that need replaced (Probably do both), Checked all over both air tanks....no leaks. The new governor is set a little high (130LBS), and I dont know if that is the cause but now I have something leaking at the dash or just under the drivers floor. I can hear it but can't find it. When I step on the brake pedal , it stops making noise. It's making a whistling noise. I'm thinking it might be a brake light sensor or something on those lines. BUT, the $150 dryer pops off perfectly and all is good. Put my new Microwave in today and fixed my horn. Been a good day, I'd have to say.
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Old 10-03-2021, 01:31 PM   #7
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Way to go! Hope it works better than the one you had.
Hey, If you ever have issues with your dryer , you should look into the AD9. It's THE most popular dryer in the trucking industry. A lot cheaper to service or replace and everyone carries parts for them. This one mounted right up to the Pure Air Plus bracket with no issues. I bought a AD9 bracket but I didn't need it. Pretty much plug and play. Check it out, do some research on the AD9, it's a lot easier on the pocket book, for sure.
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Old 10-03-2021, 01:39 PM   #8
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Right under the drivers side floor attached to the frame is the "stop lamp" air switch. I remember working on it when I had the 1997 coach. If memory serves me, I think I got a new switch from NAPA.
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Old 10-04-2021, 03:32 AM   #9
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Right under the drivers side floor attached to the frame is the "stop lamp" air switch. I remember working on it when I had the 1997 coach. If memory serves me, I think I got a new switch from NAPA.
Crazy thing, after I posted "THE NOISE" , I went back out to the RV and was messing around. I realized the brake button was pushed in (I had released the brakes earlier), I pulled the brake button to engage the brakes and noise stopped. It must be some kind of warning. Door was open the whole time. I shut the door. Pushed button back in. No noise. Opened the door and noise came back. Some kind of safety device.
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Old 10-04-2021, 07:15 AM   #10
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That's weird.
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