I've got ACE and SLS (airbags) in my D2a V8 4L and I've noticed two things when stopping at traffic lights:

1) Sometimes the rear will lower a little. It looks like the front is raising but obviously that can't be since it's got coils, right? Or can ACE do this?

Is that normal? Does yours do it too? Or is it a sign that the SLS is failing?

(I had the rear drop completely to the very lowest setting the other day when driving on a lot of curves and speed bumps. It then raised up later and I've never found it sagged in the morning.)



2) Sometimes shortly after braking to stop in traffic, the front will raise up very quickly like it's getting unstuck from something.

Is that an issue with shocks (probably the original ones still, after 75,000 miles on the clock), or is it something to do with ACE?

Hi, this sounds like you have a leak somewhere. Mine had some odd behaviour in that it would never sink overnight even if it was left unused for a week but when driving & not always it would drop to the bump stops but if I stopped, turned the engine off then restarted it, it would re-inflate the air bags. It turned out there was a small hole in one of the bags but it always occurs under the folds where you can't see ! Try spraying soapy water on the bags/pipes etc to see if you can detect any leaks. DO NOT put any body parts between the trucks body or chassis e.g over the top of the rear wheels to spray the bags or get underneath it without axle stands/jacks in place to stop the body dropping, people have been seriously injured where the body has dropped unexpectedly ! (New drivers side air bag cured mine).

I'd be inclined to fit new bags as a matter of course depending on age and mileage covered by current ones