Automatic Level Control

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The Classic Cadillac Forum Discussion, Automatic Level Control in Past Cadillac Vehicle Discussion; I was hoping I could get some insight into the automatic level control on my 76' Eldorado. I replaced my ...
  1. #1
    tonyism7 is offline Cadillac Owners Member
    Join Date
    May 2012

    Automatic Level Control

    I was hoping I could get some insight into the automatic level control on my 76' Eldorado.

    I replaced my quadrajet with a rebuilt unit, and when I was hooking the vacuum lines backup (they were a mess) I noticed the vacuum line to the compressor was unhooked and plugged. So I hooked that line back up to manifold vacuum. Now I want to make sure the rest of the system is hooked up correctly.

    Looking at the compressor, there are two vacuum lines, one going to manifold vacuum and the other going to the air cleaner. I also found one airline on the side of the compressor running to the back of the car and to the regulator mounted near the rear regulator.

    The regulator has a vacuum line about 6 inches long that's not connected to anything on it. The aforementioned airline from the compressor is also connected to the regulator, as well as another black air line, which I was not able to follow.

    I also found two more black air lines hanging unattached to anything near the regulator. I'm assuming these should be attached to something, but maybe they're left over from past repair work?

    I also found another unattached air line hanging near the driver's side shock.

    The only connections I saw on the shocks were a single air line on each one, both leading to a stem behind the rear bumper.

    How do the shocks fill with air normally? Did I miss a connection? Air hissed from the shock when I uncoupled the air hose from it. And the rear of the car rose when I put air to the rear stem, so the shocks seem to hold air.

    So does anyone know where the hanging air lines should go?



    Just realized I put this in the engine section. So I'd appreciate if a mod could move this.

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  3. #2
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
    Join Date
    Feb 2007

    Re: Automatic Level Control

    Your hanging air lines are the original ones. They have been bypassed with new ones running to the stem in the back bumper. Somebody didn't want to spend the time and money diagnosing the compressor for some reason. If you have time and money you could probably fix it but the manual fill isn't all that inconvenient in my opinion unless you regularly carry passengers in the back seat. Then it is nice to have it adjust automatically.

  4. #3
    tonyism7 is offline Cadillac Owners Member
    Join Date
    May 2012
    Thread Starter

    Re: Automatic Level Control

    Thanks, I suspected as much. It's not a big deal, but it's nice to have everything working. I probably won't spend money on it, but I'd at least like to get it hooked up right.

    I'm still not sure how air get's from the regulator to the shocks. I didn't see any connections between them, but perhaps I need to take a closer look.

  5. #4
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
    Automobile(s): 1970 Eldorado.
    Join Date
    Sep 2005
    Dutchman in Germany

    Re: Automatic Level Control

    I fixed my air pump which seems to be exactly the same for my 1970 eldo.
    The only thing wrong with it, was the rubber o-ring on the 'compressor' plunger. It comes apart relatively easy.

    I posted pics in another thread

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