mikefitz

The air suspensionis on the rear only with a F11. Your garage is wrong. If it goes down there is a leak in one or both air springs, or less likely, a leak In the valve block situated on the compressor assembly. If there are intermittent issues with the air springs not being filled by the compressor then, a) the electrical feed is failing due to the relay, faulty fuse or wiring. Changing the relay is a low-cost easy solution. b) the compresser is working too hard , overheating, and being shut down by the cars electrical system. c) the compressor control valves are partially fauly, sticking in the 'dump air' position. d) the compressor has mechanically partially failed. My recommendation is to change both air springs and the compressor control relay as first step. Air spring from ebay £ 50 to 60 for a pair, or Dunlop brand, again on ebay ,£ 200 for two. (Take care some sellers are selling the low cost unit at high prices) The quality is equal to BMW items. They are not handed and take 30 minutes to fit. Easy as a diy, you tube will show you how. If you can change wheel you can fit an airspring. In the unlikely event that the issue persists then the compressor needs looking at. The replacement distribution valve and air dump valve are available on ebay and amazon at low cost. Even a complete compressor assembly is not too expensive on ebay. Mike