I think I have read many threads several times but still have problems getting my head around this question.
I want to remove all four threaded adaptors (one for each air strut) at the valve block and use them one at a time to inflate each air strut to check for leakage the length of the line to the air strut. To do tis, I need to make up two adaptors so I can attach my shop compressor.
Does anybody know what the size of these male threaded components are? Front are different to rear. One thread says the rear connectors are 5/16" UNF with a 4mm airline and the front connectors 1/8 BSP with a 6mm airline which sounds a bit odd.
I plan to visit my local hose specialist tomorrow and would prefer not to cut off the female ends to take with me.

Can anybody confirm or deny these assumptions?
Many thanks in advance
Steve

 

Good luck with this and let us know if you get the adapter sizes worked out, as this is useful info for anyone doing leak tests on these - something that will become more prevalent over time as these cars age. I know the fallback is a set of coilovers, but I personally would only go that route if the system got completely unmanageable. I expect you will find the connections use standard fine metric threads.

While it's possible to use ride height calibration in SDD to manually lower the ride height, lowering the car more than perhaps 10mm would have detrimental effects on ride quality - something already compromised by the 18 and 19 inch wheels these came with. The air suspension, when new, and all components and bushings perfect is actually very good. But it is not very forgiving to any component failure. Probably the single most troublesome and controversial issue the X350 has.

I've often wondered if someone truly skilled in such things could manually force the lowering at speed mode of this suspension. In addition to relying on vehicle speed, the invention I seek would manually enable the following:
- When the vehicle maintains a speed of 160 km/h (100 mile/h) or above, and 10 seconds elapse, the suspension lowers 15mm below the standard ride height.
- The suspension returns to a standard ride height when the vehicle speed decreases below 140 km/h (88 mile/h) and 5 seconds elapse.

Did anyone ever pick up on the fact that the trigger to raise the car back occurs at 88 MPH? To paraphrase Doc Brown: "When this baby hits 88 mile per hour your gonna see some serious $H1T! - or perhaps: "your gonna see some anti-climactic body motions that will hardly be noticeable!" -doesn't have quite the same drama to it somehow.

 

My task today was to change all of the O rings at each end of the air line for each wheel. A nice "busy task that isnt very demanding. The old O rings looked tired and flat so were due for replacement. I did find a threaded adaptor off my Mercedes 560SL fuel valve system. It threaded perfectly into my rear struts so ts definitely metric. I will take it down to Lowes later to find out what the thread is and report back. I also found a brass threaded adaptor that fits perfectly into the front strut so will take that with me as well.
I came in to get a cold one and cool off, leaving the engine and compressor running. By the time I left, all four corners were coming up and were just about an inch shy of where they need to be.
Steve

 

OOps - wrong thread !

 

can you confirm the sizes, I also want to do some valve block testing.