4.8is Ride Height Calibration

[X5monsterBMW]

Arrrrrgh!
Hi folks.... I've turned up back on this thread like a bad penny!

Quick question to the experts re: ride height again...... again..... again.....

Having restored my compressor with the 'ring' & new cyl head couple years back, my air suspension has worked perfectly ever since - SLS inactive once when I went to South France (v hot) & my YAW sensor under centre console fried... anyway.... back to the ol' subject that we all love!!!!

I have had the car (ride height) levelled (re-calibrated) twice since then - nothing major but whilst replacing the odd bit or suspension arm had it done whilst there.

I have always used my indie BMW guy to do this - he charges peanuts and once did not charge me at all once..... I watched him do it - loaded up the car (full tank & lots KG's) & plugged his machine in... goes through a sequence (& mine as 4.8 was set at the sport level) & at the end (regardless of resistance readings from sensors) sets the default zero level.

Lately my ABS has been cutting in (fighting back when not wanted)... turns out that if a single front height is wrong by over 30mm it in turn causes the steering wheel to be slightly off kilter when driving straight - this acts with the steering angle sensor & YAW & confuses the ABS system.... but no faults or codes show......... when pumped level problem desists.

OK - here it is - sorry for pre-amble.
I'm RHD
My NSF height is 40mm below where it should be - other 3 are fine - no leaks etc - all functioning - but always returns to this!

BMW guy says that car thinks it is level - so keeps returning there.

Q... can I sort this myself?? I can raise & lower corners on my pal's machine but cannot then set zero. If so what machine & S/W do I need - can I buy it cheap?? HELP..... if not how would I sort this (pump up NSF by 40mm) & set zero level? Is there another system that maybe a local garage has...... pls advise on spec.

Another couple of guys had this - one had a bent track arm from hitting a pothole - the other had a knackered (distorted) little plastic arm from sensor to little mini ball joint. No faults but car not level!

Another guy levelled his by rotating the sensor bracket very very slightly in order to demand more/less pump in that specific bag...... is this legit - or asking for trouble...??

Pls help - as here we go again!!!

V best
malc