Transmission, wheels manual inspections -procedures

Hi on monday my mechanics will be changing brake disk as well as some suspension parts(mentioned in my previous post)
Just to avoid potential problems I would like to ask You about some procedures

So during that repair I would like to check also descibed i previous post harnshness.. to do so I need to spin a front wheels

Spining wheels mean leave gear box to N posiotion and ignition key in ON position,

1)How about any faults/problems connected with liffted wheels and igniotion in ON posiotion?

2)Is it safe to leave the key in ON position and lifting car?(with conventional lift so wheels will be hanging freely)

I need to manualy move freely hanging wheels to hear baearing or cv joint etc? how to safely do it?

and one more question regarding brake disks and pads change

any hints during the procedure specific to L322 ? Any parts which will be unscrewed , disassemblied etc except disk, pads and ABS sensors need to be replaced just in case to avoid additional cost in the future?

thx for any advice and sorry if it sounds naive or stupid... this is my first air suspensioned car





rgds

You need to get a copy of RAVE http://www.landyzone.co.uk/lz/f38/rave-cd-downloads-free-46086.html

Ok brakes disks ,pads replaced ...however harshness not gone...
I lifted car and start driving with free wheels , harshness not exist ,only available when car is driving (accelerating ) on ground and only for a few seconds in different gears ( it's rather rpm related then gears) its like two surfaces touch accidentally to each other ...not idea what to check and how to find the root cause
Any idea ??