AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System https://www.carmanualsonline.info/img/6/839/w960_839-0.png AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 41
Air suspension strut design
In the case of the quattro suspension strut, 
the connection/seal between the air spring 
(piston) and the damper is made via a double-
sealed bayonet connector.
The bay

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 42
Self-levelling suspension, A6
Specially adapted rubber bushes prevent any 
signiÞcant vibration transfer to the bodywork.
Ensure that rubber bushes are installed 
correctly!
Both halves of the met

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 43
Diagram of pneumatic 
system
1 Suction Þlter
2 Compressor with motor V66
3 Non-return valve 1
4 Air dryer
5 Non-return valve 2
6 Non-return valve 3
7 Throttle
8 Discharge Þlter
9 Pneumatic discha

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 44
Self-levelling suspension, A6
The compressor
The compressed air is generated by means of 
a single stage piston compressor with 
integrated air dryer. In order to avoid oil 
contamination of the U-

Page 45 of 64

AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 45
Suction/compression
When the piston moves 
upwards, air is sucked into the 
crankcase via the sinter Þlter. The 
air is compressed above the 
piston and enters the air dryer 
via non-return valve

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 46
Self-levelling suspension, A6
Discharge/lowering
The air spring valves N150 and N151 and 
discharge valve N111 open during 
compression. The air spring pressure ßows to 
the pneumatic discharge va

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 47
The air dryer
The air must be dehumidiÞed in order to 
prevent condensate and the associated 
problems of corrosion and freezing. The 
system used here is a so-called regenerative 
air dryer syste

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 48
Self-levelling suspension, A6
Regeneration
As outlined above, the compressed air is 
initially fed through the air dryer and dried. 
The moisture is temporarily stored in the air 
dryer and the dri

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 49
At an air spring pressure of >3.5 bar, the valve 
body lifts against the resilience of both valve 
springs and opens valve seats 1 and 2. The air 
spring pressure then passes to the air dryer 
via

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AUDI A6 ALLROAD 1999 C5 / 2.G Pneumatic Suspension System 50
Self-levelling suspension, A6
The pressure limiting function protects the 
system against inadmissible high pressure 
e.g. when the compressor fails to switch off 
due to a defective relay contact