Community Forums

Ryan Davis · 07-31-2022, 06:46 PM

Having a problem with my Mac solenoid. Model #
45A-AA2-DFEA-1BA air is leaking out of the air vent bolt where its perforated where my finger is pointed I'm the attached photos. The rv can only get up to 90psi and it will hold there but will continue blowing air out of the air vent. If I put my foot on the accelerator I can get it to right about 120 psi as it would normally do before this issue then the compressor shuts off and it rapidly drops back down to roughly 90 psi. Is this solenoid my failure point ? Is it the air vent? Any recommendations would be greatly appreciated.

2001 holiday rambler ambassador. air brakes and air suspension.

jacwjames · 07-31-2022, 07:17 PM

This is the dump valve, my guess there is debris in it not letting it completely seal off.

If you are comfortable working on it I'd take it off/apart and try and clean it.

Ryan Davis · 07-31-2022, 07:23 PM

Thanks I will do this now and let you know how it goes!

Ryan Davis · 07-31-2022, 08:43 PM

After you advised opening up the solenoid I noticed the valves with screws on the outside. I turned the shutoff valve until it was flush with the inner housing and the rv shot up to 120psi and holding. There is very little air leaking out of the air dump valve now. Think I'd you tried blowing air through a 5ft straw. My question is if there is anything I should worry about by doing this or is my problem solved. I have a photo attached to show which valve I tightend. Thanks in advance.

jacwjames · 08-01-2022, 07:20 AM

Do you have an air actuated step cover that slides out over your front steps.

I checked the number and it matches the air solenoid for the step cover. It is adjustable to control the speed at which the cover goes in/out. Adjusting the screws affect the speed at which the step cover moves.

If this is the solenoid then you can adjust it until the leak stops but you won't have function of the step cover.

Attached are the parts pages for my step well cover.

Ryan Davis · 08-12-2022, 07:06 AM

Just getting back to you but yeah the steps have been broken since I bought it so I definitely solved my issue as I just put a pin in the steps now to hold them up or release them. Would be a nice quality of life feature to have steps again though. I appreciate all your help! No to figure out how to locate a new brake caliper on another issue.

jacwjames · 08-12-2022, 07:50 AM

The step wheel cover is pretty simple, consists of the sliding track system, air cylinder, and the air solenoid valve.

I would remove the solenoid valve and try to clean it to make sure it sealing correctly.
One problem is the air cylinder they used was hydraulic so potentially the seals in the piston could fail. You might try putting some light weight in the air supply tubing.

The step itself can be removed to access the cylinder.