Evening all, I took the airmatic compressor of my E55 today to replace piston ring, gasket, rubber pipe work and general clean up. I also Checked pipework on valve block, everything seems in order and car raising quicker now on the front end, have to check lines and block in the rear now as car is lower by around 10-15mm on the near side, although I'm getting some clunking at the back that could be shocks, they look dry from what I can see but have to look deeper, does anyone know if these cars suffer with faulty level sensors, thanks for any advice.