E70 Under-carriage OverHaul. Advice

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My E70 need some TLC, so before I dive into it, I could need some advice.

So here goes:

Front: Left front spring is broken. Seems like the lower part of the spring has somehow jumped past the pad. Hard to see, but guess the spring is broken.

Plan to buy new spring and lower pad and have them replaced.

Right side spring looks OK with no visible rust like the left one, so I guess I will stay with replacing the left only.

However, the question is. When I have the damper and spring assembly out on a car that has 135.000km on it, should I consider changing the suspension strut too? I know I will have to do both sides then.

My feeling is that the car is performing pretty ok. Tilt a bit when turning, and we get thrown around a bit when hitting side bumps, but it feels more like from the back. Could be the Air springs. Those need replacement as well. And haven't heard the compressor for a while.

Sort of thinking that I should go all in and do the following:
+ Both Air springs rear. Possibly change Compressor if broken.
+ Replace suspension on all corners
+ New left spring
+ Have car realigned.

Just the parts will be a killer, but I rather do it all ones, than to change the spring now, then have to come back and do the whole thing again because the suspension is bad.....

OR, I change the spring and the rear airbags(and maybe compressor) and see how it performs.


Espen