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76 Eldorado Rear Load Level


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Hello Everone, I am new to this forum and new to Cadillac ownership. I just bought a very nice 76 Eldorado Convertible. The car seems to be in very good condition except for the rear load level system. I cannot get the underhood pump to work. The car sits level, but it wallows pretty bad when I drive it. What is the air valve that looks like a tire stem on the side of the pump for? How hard is it to replace the rear shocks with some standard heavy duty shocks maybe for a Toronado since I think it is built on same platform. Thanks, Mike

Edited by GTOMike
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I had a 74 eldorado with the same pump. You have air shocks in the back. I put a T in the line and put a shrader valve in line and just filled the shocks directly, eliminating the pump.

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I had a 74 eldorado with the same pump. You have air shocks in the back. I put a T in the line and put a shrader valve in line and just filled the shocks directly, eliminating the pump.

I was hoping that I could add air to the system by that air valve on the side of the pump. What is that valve for?

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I remember that schrader valve, I am not sure what it was for, it may have been to relieve pressure, but as you note it could be for pressurizing the system.

I have an old manual, Ill see what I can find out

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I remember that schrader valve, I am not sure what it was for, it may have been to relieve pressure, but as you note it could be for pressurizing the system.

I have an old manual, Ill see what I can find out

Thank You!

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With the air shocks on my fleetwood they suggest between 20 and 80 psi. So use that as a reference if you want to try to air them up manually. If there is oil around the shock then the shock is bad. Also its usually a 1/8" air line and you can get push-in fittings from the hardware store.

The "heavy duty" shocks that you can replace the air ride with ride like crap! Way too stiff for a cadillac. Try to make an air setup work or buy stronger springs and normal shocks.

* 1966 Deville Convertible

* 2007 Escalade ESV Black on Black

* 1996 Fleetwood Brougham Black on Black V4P -Gone
* 1983 Coupe Deville Street/Show Lowrider -Gone

* 1970 Calais 4dr Hardtop GONE
* 2000 Deville DTS - Silver with Black Leather and SE grille GONE
* 1999 Seville STS - Pearl Red GONE

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Ok I looked in an old Chilton's 1978 manual and all they did was briefly describe the system and show a couple of diagrams

That is a vacuum compressor driven by engine vacuum. When mine worked it ticked, like a time bomb.

I did find this regarding the vacuum compressor, hope this helps

http://wikicadillac.org/tiki-index.php?page=Automatic+Level+Control

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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If you need to replace that compressor here is one from a 74 for $225

http://www.cadillacville.com/default2/webstuff/model74/74Cadillac.htm

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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If you need to replace that compressor here is one from a 74 for $225

http://www.cadillacville.com/default2/webstuff/model74/74Cadillac.htm

Body by Fisher and Coupe DTS, Thank you both very much for your help. Now I need to find a lift and get started.

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Good News! I didn't know about the delay built in until I read the literature that was sent to me. I had been bouncing the rear and expect the pump to start. I got my next door neighbor and he and I both sat on the back bumper and guess what. After about 10 seconds the pump started and the rear started rising!

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That is great glad to hear it

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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