air suspension AUDI A4 1999 B5 / 1.G Suspension Wheel Alignment Workshop Manual

44-7

Suspension codes, checking
requirements


Information on weight codes (code number)

From m.y. 1998 , spring/shock assemblies will
be classified according to weight codes (code
number) so that suspension components can be
matched easily.
The spring/shock assembly installed in the
vehicle is indicated by the weight code on the
vehicle data label.

Specified values for wheel alignment
1BA = Standard suspension
1BC = Special purpose suspension
Special purpose vehicles suspension -1BC- have
the same specified values for wheel alignment as
the standard suspension -1BA-.
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44-8


Example of vehicle data label
In this example the vehicle is installed with the standard suspension,
version 1BA (arrow).
The vehicle data label is located in the spare wheel recess and in the
vehicle Maintenance booklet.
Factory codes for the suspension:
1BA: Standard suspension1BE: Sport suspension 1BB: Heavy duty suspension (approx. 20 mm (3/4 in.) higher)1BC: Special purpose suspension1BD: Sport suspension, Audi S41BH: USA1BT: Heavy duty suspension (approx. 7 mm or 1/4 in. higher)1BP: Heavy duty suspension (same ride height as 1BA but with limited
bump)
Pa
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44-9

Requirements

Test equipment must be properly adjusted
and attached to vehicle (refer to equipment
manufacturer's instructions)
Equal tread depth for both tires on each axle,
with difference between two not more than 2
mm (0.079 in.)
Tires inflated to correct pressure
Sliding plates and turntables not positioned
against any stop when checking wheel
alignment
Vehicle at correct curb weight 1)
Vehicle accurately positioned, suspension
bounced and rocked several times and
allowed to settle
Suspension, steering and steering linkage in
proper condition with no damage or
excessive play
Carry out axial wheel run-out compensation.
Since some wheel run-out is allowable,
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44-10
Wheel alignment must be checked if

There are problems with vehicle performance.
There is accident damage.
Tires are worn on one side.
Axle components have been removed table below.Front axle component
removed or replaced Alignment check
required S-point adjustment
required Rear axle component
removed or replaced Alignment check
required

Yes
No
Yes
No
Yes
No
Rear upper link X X Shock absorber X
Front upper link X X
Guide link with hydraulic-
bushing X X Coil spring X
Suspension strut X X
Track control link X X Upper control arm 1) X
Mounting bracket X X Lower control arm 1) X
Wheel bearing housing X X Wheel bearing housing1) X
Tie rod X X Track rod 1) X
Steering gear X X Subframe 1) X
Pa
ge 7 of 37 Wheel ali
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44-11
Wheel alignment specifications (front-wheel-drive vehicles)


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
-25 25
-40 25
-15 25
-30 25 1)
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) +7 2
+7 2
+7 2
Toe constant for each wheel (check
value) +7 7
+7 7
+7 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)
Pa
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44-12

Rear axle
Standard
suspension (1BA)
Special suspension
(1BC)
Heavy duty
suspension (1BP) Sport
suspension
(1BE) Heavy duty suspension
(1BB), (1BT1))
Camber
-1 30 20
-1 30 20
-1 30 20
Maximum allowable difference in camber between
two sides 30
30
30
Overall toe
+20 +15/-10
+28 +15 /-
10
+14 +15/-10
+17 +15 /-10 1)
Maximum allowable difference in direction of travel
relative to longitudinal vehicle center line (thrust
angle) 15
15
15
1) Applies only to vehicles with heavy duty suspension (1BT)
Pa
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44-13
Wheel alignment specifications (all-wheel-drive vehicles)


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
-25 25
-40 25
-15 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) +7 2
+7 2
+7 2
Toe constant for each wheel (check
value) +7 7
+7 7
+7 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)
Pa
ge 11 of 37 Wheel ali
gnment
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44-14

Rear axle
Standard
suspension (1BA)
Special suspension
(1BC)
Heavy duty
suspension (1BP) Sport
suspension
(1BE) Heavy duty suspension
(1BB), (1BT1))
Camber
-40 30
-40 30
-40 30
Maximum allowable difference in camber between
two sides 30
30
30
Overall toe
+8 5
+8 5
+8 5
Maximum allowable difference in direction of travel
relative to longitudinal vehicle center line (thrust
angle) 10
10
10
1) Applies only to vehicles with heavy duty suspension (1BT)
Pa
ge 12 of 37 Wheel ali
gnment
11/19/2002 htt
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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)
Pa
ge 13 of 37 Wheel ali
gnment
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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pair&id=AUDI.B5.SU01.44.2

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)
Pa
ge 14 of 37 Wheel ali
gnment
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU01.44.2