Air Spring / Shock Absorber Question
 

Well, it happened to me. Looks like the front driver's side is sagging. Time for new airbags. I know it was only a matter of time, so i am not that bummed about it. From what I read on this forum, the DIY doesn't seem that bad. I think I'll film a DIY video for you guys.

My question though is if I buy a new air spring from Arnott, that is just the spring. If I a buy a new strut assembly, does that include the shock absorber? I don't mind swapping and getting a new SA, as mine are probably original at 112K.

• What are my SA options?
• Can I get Koni or OE? I am unsure of the quality that Arnott is using.
• Should I replace the rear SA too if I replace the fronts?
• Do I need to do an alignment for replacing the front air springs/ struts and rear SA?
• Do I need a GT1 to re-calibrate the front air springs if I replace the OE with Arnott?
• Anyone have a GT1 in the Toms River area?

Thanks!

JP

You can buy either just the air spring or a complete remanufactured strut. Many guys here use the arnott rebuilt units with positive results.
As far as i know its a straight R&R with no recoding as long as you do not have the "air susp. inac." message.

Okay, so the reman. strut includes a "new" shock absorber?

Correct.

Thanks guys, this was helpful. I'll upload a air strut replacement video DIY guide this weekend.

As promised, albeit a little late - http://www.xoutpost.com/bmw-sav-foru...ent-guide.html

Next question, if I swap out my rear shocks for new ones, do I need to do an alignment?

I wouldn't think so as it shouldn't change the geometry. Same goes for changing the airbags in the rear. The system should adjust to keep the same ride height.

When you change ride height is when you need an alignment.

Cool. I figured that, but just wanted to ask the experts...

Another one for ya, I noticed there are two different sized Dampers on REALOEM, one is 80mm and one is 90mm, part number 33536751030 and 33536762407 any idea which is the correct size?

Diagram here: RealOEM.com * BMW E53 X5 4.8is SINGLE COMPONENTS FOR REAR SPRING STRUT

I don't really know but double-check with the dealer. I wonder if the correct one comes with the shock?

Funny but for the 3.0 they list the same part numbers. If it had the Sport suspension only = 90mm. If it had the Sport AND 2-axle self level suspension = 80mm.

So, going by that the correct one would be 80mm.

However, was the 2-axle self-level suspension available with 3.0s?! The rear yes but both axles? :dunno:

And another thing, why do they list both 90mm and 80mm for the 4.8?! Maybe someone here will be able to explain.

Sorry, I know its not much help. Calling mrbmwx5! :rofl: