sensor AUDI A4 1998 B5 / 1.G Suspension Mount ABS Workshop Manual

45-24


Suspension mounted ABS
components Front suspension ABS components,
removing and installing

WARNING!

Do not re-use any fasteners that are worn or
deformed in normal use.
Some fasteners are designed to be used only
once, and are unreliable and may fail if used
a second time. This includes, but is not
limited to, nuts, bolts, washers, circlips and
cotter pins. Always follow the
recommendations in this manual-replace
these fasteners with new parts where
indicated, and any other time it is deemed
necessary by inspection.
1 -
ABS wheel speed sensor
Identical part on left and rightRemoving and installing page 45
-27
Harness connector for ABS wheel speed
sensor page 45
-27

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45-25


WARNING!
Do not loosen and tighten hex bolt - 3 - unless
car is standing on its wheels-risk of accident. 2 -
Drive axle with ABS wheel speed sensor
rotor
Examine rotor for signs of dirt and damage
page 45
-28

If rotor is damaged, replace outer CV joint
together with rotor Repair Manual, Suspension, Wheels, Steering, Repair Group 40

Outer CV joint is supplied as replacement
part with ABS wheel speed sensor rotor
3 -
Collar bolt Always replaceBe aware of different versionsM14 thread: tighten to 115 Nm (85 ft lb)
plus additional 1/2-turn (180 ) M16 thread: tighten to 190 Nm (140 ft lb)
plus additional 1/2-turn (180 )
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45-27

ABS wheel speed sensor on front axle,
removing and installing

Removing

- Loosen wheel bolts.

- Raise vehicle.

- Remove wheel.

Installing - Detach boot -1- from wheel housing.
- Separate harness connector -2- from ABS wheel speed sensor
harness.
- Pull harness out of brackets (arrows).
- Remove ABS wheel speed sensor from wheel bearing housing.
- Before inserting ABS wheel speed sensor, install boot seal and grease
sensor all around with assembly paste.
- Press speed sensor in by hand until fully seated.
- Connect ABS wheel speed sensor cable harness connector and press
boot into wheel housing.
- After routing ABS wheel speed sensor cable (arrows), install wheel and
tighten wheel bolts to 120 Nm (89 ft lb).
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45-28

- Turn steering to full left and full right lock and
check clearance of ABS wheel speed sensor
cable.

ABS wheel speed sensor rotor on front axle,
examining

- Raise vehicle.

- Remove wheel.

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

- Examine rotor for signs of dirt and damage,
working through ABS wheel speed sensor
mounting hole in wheel bearing housing.

Note:

If the rotor is dirty or damaged, remove the
drive axle. If the rotor is damaged, replace the
outer CV joint along with the rotor.

Repair Manual, Suspension, Wheels,
Steering, Repair Group 40

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45-29


Rear suspension ABS components for
FWD models, removing and installing

WARNING!

Do not re-use any fasteners that are worn or
deformed in normal use.
Some fasteners are designed to be used only
once, and are unreliable and may fail if used
a second time. This includes, but is not
limited to, nuts, bolts, washers, circlips and
cotter pins. Always follow the
recommendations in this manual-replace
these fasteners with new parts where
indicated, and any other time it is deemed
necessary by inspection.
1 -
ABS wheel speed sensor
Identical part on left and rightRemoving and installing page 45
-31
Release harness connector of ABS speed
sensor cable and separate. Unclip speed
sensor cable.
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45-30


2 -
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
3 -
Axle beam/rear axle with splash guard
and stub axle
4 -
ABS wheel speed sensor rotor Removing and installing page 45
-33
5 -
Brake disc with wheel hub
6 -
Outer wheel bearing
7 -
Thrust washer
8 -
Hex nut
Adjusting page 45
-33
9 -
Castellated lock
Install onto hex nut
10 -
Grease cap Replace
11 -
Cotter pin
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45-31

ABS wheel speed sensor on FWD 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.

- Pull ABS wheel speed sensor cable out of brackets.
- Pull ABS wheel speed sensor out of axle beam.
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45-32

Installing

- Replace clamping sleeve page 45
-30
item - 2
-.

- Grease ABS wheel speed sensor all around with
assembly paste before inserting. Then, press in
by hand until fully seated.

- Reconnect ABS wheel speed sensor cable and
route cable as when removed.
When routing the ABS wheel speed sensor
cable, pay attention to the following points:

- Route ABS wheel speed sensor cable -1- below brake line -2- on left
and right sides in area shown.
- On left side, maintain clearance of about 2 cm (3/4 in.) between heat
shield for exhaust system, and ABS wheel speed sensor cable.

- On right side, route ABS wheel speed sensor cable -1- between fuel
lines -2-.
- Install wheel and tighten wheel bolts to 120 Nm (89 ft lb).
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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
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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-.
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