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Pneumatic self levelling suspension system This self study programme is divided into two parts Principles of spring suspension, damping and air suspension 242 048 Self levelling suspension, A6 The rear axle air suspension system for the Audi A6 Avant is described here. 242 046 The 4 level air suspension of the Audi allroad quattro is described in self study program 243. You will find further information on the Audi allroad quattro in self study programme 241. 242 067 2 Contents Page Principles Vehicle suspension 4 The suspension system . 6 Vibration .. 8 Characteristic values of springs 12 Conventional running gear without self levelling 14 Principles of air suspension Self levelling air suspension .. 16 Characteristic values of air spring .. 21 Vibration damping .. 23 Shock absorbers vibration dampers .. 25 PDC shock absorbers .. 33 Self levelling suspension, A6 System overview . 38 Air springs 40 Air supply unit 42 Diagram of pneumatic system 43 Compressor 44 Air dryer 47 Discharge valve N111 .. 48 Valve for suspension struts N150 and N151 .. 51 Self levelling suspension sender G84 .. 52 Self levelling suspension control unit J197 .. 54 Self levelling suspension warning lamps K134 . 55 Function diagram .56 Interfaces .. 57 The control concept .. 58 Other features of the control concept .. 60 New Important The self study programme will provide you with Note Note information on design and functions. The self study programme is not intended as a workshop manual. For maintenance and repairs please refer to the current technical literature. 3 Principles Vehicle suspension When a vehicle travels over irregular road When we talk about the vehicle suspension surfaces, impact forces are transmitted to the we can basically distinguish between the wheels. These forces pass to the bodywork suspension system and the vibration via the suspens