suspension AUDI A4 1998 B5 / 1.G Suspension Wheel Alignment User Guide

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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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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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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44-32

Bring vehicles with heavy duty suspension
1BB (vehicle ride height 20 mm higher) into
defined starting position B1 page 44
-28


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.

- Insert VAG1925 spacer together with VAG1925/4 adapters and screw
both threaded spindles out...

Make sure vehicle is not raised using the above procedure - ...until they just rest against front subframe bolts (arrow).
Vehicle with heavy duty suspension 1BB is now in defined starting
position B1
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44-33

Notes:
For all suspension versions (1BA, 1BC, 1BE,
1BP and 1BB):

The defined starting position B1 is the position
the springs must be in when using the wheel
alignment program to check the actual toe-in
setting C1 for each wheel ( page 44
-27
).
Setting C1 should match the specification + 10`
30` (rough pre-adjustment). If necessary, the
toe-in must be corrected by adjusting the tie rod
length.

Wheel alignment specifications page 44
-
11
.

If the settings need to be corrected, this will be
indicated by the wheel alignment program.

CAUTION!
Make sure that the wheels do not loose
contact with the turntables during the lifting
operation.
If wheels do loose contact, do not move the
turntables. Otherwise incorrect
measurements will result.
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44-34

Extending the springs (standard, sport and
heavy duty (1BP) suspensions

CAUTION!

Make sure that the wheels do not lose
contact with the turntables during the lifting
operation.
If wheels do lose contact, do not move the
turntables. Otherwise incorrect
measurements will result.

- Raise vehicle at front jacking points.

Vehicle is now in position B2 page 44
-27
- Lift cylinders out of threaded spindles and secure in position using
locking pins.
- Make sure locking pins (arrows) are correctly positioned.
- Lower vehicle down onto spacer gauge.
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44-35

Extending the springs (heavy duty
suspension (1BB)

CAUTION!

Make sure that the wheels do not lose
contact with the turntables during the lifting
operation.
If wheels do lose contact, do not move the
turntables. Otherwise incorrect
measurements will result.

- Raise vehicle at front jacking points.

Vehicle is now in position B2 page 44
-27
- Lift cylinders out of threaded spindles and secure in position using
locking pins.
- Make sure locking pins (arrows) are correctly positioned.
- Remove VAG1925/6 adapter.
- Lower vehicle down onto spacer gauge.
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