1998 AUDI A4 air suspension

44-15
Wheel alignment specifications (front-wheel-drive vehicles with aluminium mounting bracket)


Specifications valid for all engine versions
Front axle
Standard suspension
(1BA)
Special suspension
(1BC)
Heavy duty
suspension (1BP) Sport suspension
(1BE) Heavy duty suspension
(1BB), (1BT1))
Camber
-35 25
-50 25
-20 25
-30 25
Maximum allowable difference in camber
between two sides 30
30
30
Toe setting for each wheel (curb weight)
+10 2
+10 2
+10 2
Toe check value for each wheel (curb
weight) +10 5
+10 5
+10 5
Toe constant for each wheel (setting
value) +9 2
+9 2
+9 2
Toe constant for each wheel (check
value) +9 7
+9 7
+9 7
Toe-out on turns at 20
-1 20 30
-1 20 30
-1 20 30
1) Applies only to vehicles with heavy duty suspension (1BT)
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44-16
Wheel alignment specifications (all-wheel-drive vehicles with aluminium mounting bracket)


Specifications valid for all engine versions
Front axle
Standard suspension
(1BA)
Special suspension
(1BC)
Heavy duty
suspension (1BP) Sport suspension
(1BE) Heavy duty suspension
(1BB), (1BT1))
Camber
-35 25
-50 25
-20 25
-30 25
Maximum allowable difference in camber
between two sides 30
30
30
Toe setting for each wheel (curb weight)
+10 2
+10 2
+10 2
Toe check value for each wheel (curb
weight) +10 5
+10 5
+10 5
Toe constant for each wheel (setting
value) +9 2
+9 2
+9 2
Toe constant for each wheel (check
value) +9 7
+9 7
+9 7
Toe-out on turns at 20
-1 20 30
-1 20 30
-1 20 30
1) Applies only to vehicles with heavy duty suspension (1BT)
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44-17
Wheel alignment specifications, sport suspension (1BD)

Front axle
Sport suspension
(1BD)
Camber
-50 25 Maximum allowable difference in camber between two sides
30 Toe setting for each wheel (curb weight)
+10 2 Toe check value for each wheel (curb weight)
+10 5 Toe constant for each wheel (setting value)
+7 2 Toe constant for each wheel (check value)
+7 7 Toe-out on turns at 20
-1 30 30

Rear axle
Sport suspension
(1BD)
Camber
-55 15
Maximum allowable difference in camber between two sides
30 Overall toe
+8 5 Maximum allowable difference in direction of travel relative to longitudinal vehicle center line
(thrust angle) 10
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44-27

Front axle toe-in curve, adjusting


General

Toe-in curve

Notes:

Explanation of the term "toe-in curve":
When the suspension is compressed (bumped) or extended
(rebounded) the toe of the wheel changes relative to the amount of
compression or extension. The resulting toe values can be plotted on a graph to obtain the toe-in
curve. The shape of this curve is determined by toe value C1 (measured with
the wheel in a defined starting position B1) and by toe value C2
measured at a rebound, or extension, of 40 mm or 1.57 in. (for heavy
duty suspension 1BB) or of 60 mm or 2.36 in. (for all other
suspensions) relative to starting position B1). The resulting change in toe-in, (C2 - C1) is defined as "toe constant
S."
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44-28

Sport suspension 1BE

Notes:
The toe-in curve must also be checked in the following cases (in addition
to those specified in table page 44
-10
): A Spring compression
B Spring extension (rebound)
B1 Defined starting position (vehicle at curb weight)
On vehicles with sport suspension, suspension must be extended
20 mm (0.78 in.) to this position.
B2 Vehicle suspension extended 60 mm (2.36 in.) compared to position
B1 page 44
-31
C Toe-in
C1 Toe-in measured in position B1
C2 Toe-in measured in position B2
D Toe-out
V Toe-in curve
S Toe constant, C2 - C1
If the vehicle has been in an accident or sustained damage to the
suspension components and/or bodywork. If the vehicle does not maintain direction of travel over bumps and
when braking or accelerating.
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44-29

Standard suspension 1BA, special
suspension (1BC) and heavy duty
suspension 1BP

On vehicles with standard running gear, the toe-in measurement C1 is
measured in the defined starting position (vehicle at curb weight) B1
page 44
-30
.
Heavy duty suspension 1BB (vehicle ride height 20 mm higher)
On vehicles with heavy duty suspension 1BB:
B2 Vehicle suspension extended 60 mm (2.36 in.) compared to position
B1
C2 Toe-in measured in position B2
C1 Toe-in measured in position B1 (defined starting position) page 44
-32
C2 Toe-in measured in position B2
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44-30

Setting suspension to starting position B1 (
page 44
-27
) on vehicles with standard
suspension (1BA), special suspension (1BC)
and heavy duty suspension (1BP)

Note:
Depending on the type of wheel alignment
equipment used, it may be necessary to raise the
front of the vehicle in order to position the
VAG1925 spacer. After lowering the vehicle
again the suspension must be bounced.

Do not raise the vehicle using the above procedure
The vehicle is now in the defined starting position B1 (for vehicles with
standard suspension (1BA), special suspension (1BC) and heavy duty
suspension (1BP). - Insert VAG1925 spacer together with VAG1925/4 adapters and screw
both threaded spindles out until they just rest against front subframe
bolts (arrow).
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44-31

Setting suspension to starting position B1 (
page 44
-27
) on vehicles with sport
suspension

Note:
Depending on the type of wheel alignment
equipment used, it may be necessary to raise the
front of the vehicle in order to position the
VAG1925 spacer. After lowering the vehicle
again the suspension must be bounced.

Make sure vehicle is not raised using the above procedure - Insert VAG1925 spacer together with VAG1925/4 adapters and screw
both threaded spindles out until they just rest against front subframe
bolts (arrow).
- Raise vehicle at front lifting points.

The vehicle is now in defined starting position B1 (for vehicles with sport
suspension). - Insert VAG1925/6 adapter onto VAG1925/4 adapter for spacer gauge.
- Lower vehicle onto adapters.
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