1998 AUDI A4 sensor

45-33

ABS wheel speed sensor rotor on FWD rear
axle, examining

- Raise vehicle.

- Remove wheel.

- Pull ABS wheel speed sensor out of wheel
bearing housing.

- Examine rotor for signs of dirt and damage.

ABS wheel speed sensor rotor on rear axle,
removing and installing

Removing

- Raise vehicle.

- Remove wheel.

- Unbolt brake caliper page 46
-20
.

CAUTION!

Do not loosen brake hose or lines.
Secure the brake caliper with a piece of wire
Pa
ge 12 of 20 Sus
pension mounted ABS com
ponents
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.4

45-34


Installing - Press grease cap off hub.
- Remove cotter pin page 45
-30
, item -11-.
- Remove castellated lock page 45
-30
, item -9-.
- Remove hex nut page 45
-30
, item -8-.
- Remove thrust washer, outer wheel bearing, and wheel hub page
45
-30
, items -5-, -6- and -7-.
- Use copper drift inserted through tapped holes to evenly drive rotor off
wheel hub page 45
-30
, item -4-.

- Press ABS wheel speed sensor rotor onto wheel hub.
- Position wheel hub, outer wheel bearing and thrust washer on stub
axle.
- Install hex nut page 45
-30
, item -8-.
Pa
ge 14 of 20 Sus
pension mounted ABS com
ponents
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.4

45-37


1 -
Drive axle with ABS wheel speed sensor
rotor
Examine rotor for signs of dirt and damage
page 45
-40

If the rotor is damaged, replace outer CV
joint along with rotor Repair Manual, Suspension, Wheels, Steering, Repair Group 42

Outer CV joint is supplied as replacement
part with rotor
2 -
ABS wheel speed sensor Identical part on left and rightClean inside surface of hole before
inserting sensor Replacing page 45
-39
3 -
Boot seal
4 -
Clamping sleeve
Always replaceIdentical part on left and rightGrease all around with assembly paste
before inserting into wheel bearing housingPress into wheel bearing housing until fully
seated
Pa
ge 17 of 20 Sus
pension mounted ABS com
ponents
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.4

45-39

ABS wheel speed sensor on AWD rear axle,
removing and installing

Removing

- Switch ignition off.

- Lift rear seat out of its brackets.

- Detach cable holder (right arrow), separate ABS wheel speed sensor
harness connector and press out grommet (left arrow). Left and right
sides are mirror images.
- Loosen wheel bolts.
- Raise vehicle.
- Remove wheel.

- Remove nuts (arrows) securing ABS wheel speed sensor harness
retaining plate.
Pa
ge 19 of 20 Sus
pension mounted ABS com
ponents
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.4

45-40


Installing
ABS wheel speed sensor rotor on AWD rear axle, examining
Note:
Repair Manual, "Suspension, Wheels, Steering", Repair Group 42
- Release ABS wheel speed sensor harness from holder (arrow).
- Pull ABS wheel speed sensor out of wheel bearing housing.
- Replace clamping sleeve page 45
-37
item - 4 -.
- Before inserting wheel speed sensor, install boot seal and grease
sensor all around with assembly paste. Then, press in wheel speed
sensor by hand until fully seated.
- Re-route sensor harness in reverse order of removal.
- Raise vehicle.
- Remove wheel.
- Pull ABS wheel speed sensor out of wheel bearing housing.
- Examine rotor for signs of dirt and damage.
If the rotor is dirty or damaged, remove the drive axle. If the rotor is
damaged, replace the outer CV joint together with the rotor. The outer CV joint is supplied as a replacement part with the rotor.
Pa
ge 20 of 20 Sus
pension mounted ABS com
ponents
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU03.45.4