Wheel bearing BMW 540i 1999 E39 User Guide

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300-5
Suspension, Steering and Brakes - ~enerall
The E39 rear suspension subframe is used as a rigid mount-
ing platform
forthe differential (also called final drive) and rear
suspension components. The differential is mounted to the
subframe and the subframe is bolted to the body through rub-
ber bushings which help isolate drivetrain noise and vibration.
The
€39 rear suspension is known as a modified multi-link
system. Three control arms on each side locate the rear
wheels.
The lowercontrol arm, called the swing arm, is attached to the
wheel bearing carrier through a pivoting integral link.
An eccentric mounting bolt at the rear inner mounting of the
swing arm is used for rear camber adjustment.
The inner end of the upper front control arm, called the trac-
tion strut, is also mounted with an eccentric fastener, used to
adjust rear toe.
Drive axles with constant-velocity (CV) joints at both ends
transfer power
from the differential to the road wheels.
Sedan models
The rear suspension in sedan models uses coil springs over
strut shock absorbers. The bottom of each strut bolts to the
wheel
carrier.The top strut mount attaches just below the rear
parcel shelf of the car.
Sedan models fitted with EDC (Electronic Dampening Con-
trol) use air struts.

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300-6
/Suspension, Steering and Brakes - General
Rear suspension sedan models
Coil spring
Strut
-
'01 arm
Sport Wagon models
In order to provide a wide, ilat iloor in the cargo compartment,
the rear suspension on the Sport Wagon is unique to itself.
The shoclcabsorber is attached diagonally between the lower
swing arm and a mounting bracket on the subframe. The
spring on each side is mounted between a perch at the top
oi
the wheel bearing carrier and the bottom of the cargo com-
partment floor.
Starting with
1999 Sporl Wagon models, a self-leveling air
suspension system with electronic height control (EHC) was introduced. The system is standard on
V-8 models and op-
tional on 6-cylinder models.
On models fitted with electronic height control (EHC) rear
suspension, the standard coil springs are replaced by air
springs. Air pressure in the air springs is automatically con-
trolled by the
EHC system to compensate for ride height and
load variations.

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300-1 4
I Susoension. Steerina and Brakes - General
DSC system I
Dynamic Stability Control (DSC)
Dynamic Stability Control (DSC) utilizes many principles and
components of the ASC traction control system. DSC is ac-
tive throughoutthe driving range, unlike ASC which is only ac-
tive during acceleration and braking. DSC helps stabilize the
vehicle in cornering and avoidance maneuvers by adjusting
engine controls such as throttle, ignition, fuel injection and the
application of
brake pressure individually to the wheels.
Inputs
fi- 0
2 4-* .. o
[11-' IJ
411m4
3?-
G
4 The DSC control module uses various inputs to determine
vehicle instability during braking, cornering, or reduced trac-
tion situations. Based upon these inputs the ABSIDSC con-
trol module sends outputs to the engine control module and
the ABSIDSC hydraulic unit to activate torque reduction pro-
tocols and braking intervention.
-
ABSIDSC control module
OUI~YIS
4
The DSC system can be toggled on and off by a switch
mounted on the center console. Turning off the DSC system
does not disable ABS or ASC functions.
+
Measure ride height (A) from center of fender arch to bottom
of wheel rim.
Car in normal loaded position on the ground. See Normal
loaded position.
Engine
control
module
Specified tires and wheels, correct tire pressure, even tire
wear
-'* 9-
.%A
Correct wheel bearing play
T'== ..t, 9 B
-.m
Model with air suspension (EHC): Disconnect electrical har-
ness connector to air supply pump to prevent automatic
height regulation.
When finished, reset ride height using BMW diagnostic
scan tools DIS or
MoDiC.
NOTE-
Airsupply pump is located beneath a cover under the spare
tire in the floor of the cargo compartment.
- If ride height is outside specification listed, install new
springs. Suspension spring removal and installation is cov-
ered in
310 Front Suspension and 330 Rear Suspension.
Normal loaded position
Each front seat 68 kg (150 Ib)
Center of rear seat 68 kg (150 lb)
Trunk 21 kg (46 lb)
Fuel tank full

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31 0 Front Suspension
General . . . . . . . . . . . . . . . . . . . . . . . . . . . .310-2 Front Suspension Arms . . . . . . . . . . . 310-1 2
Special tools . . . . . . . . . . . . . . . . . . . . . . . . ,310-2 Control arm, removing and installing
Front suspension variations
. . . . . . . . . . . . ,310-4 (6-cylinder models) . . . . . . . . . . . . . . . . . . 31 0-1 2
Control arm, removing and installing Front Strut ' ' ' ' ' ' ' ' ' ' ' ' ' ' '310-4 ("-8 models) , , , , , , , , , , , , , , , , , , , , , , , 310-13 Front strut assembly, removing
Tension strut, removing and installing . . . . 310-16 and installing . . . . . . . . . . . . . . . . . . . . . . . . ,310-5 Tension strut bushing, replacing . . . . . . . . 310-18 Front strut assembly components
(6-cylinder models)
. . . . . . . . . . . . . . . . . . ,310-9 Wheel Bearings, Front . . . . . . . . . . . . . 310-18
iron; strut assembly, disassembling Front Stabilizer Bar . . . . . . . . . . . . . . . 310-22 and assembling . . . . . . . . . . . . . . . . . . . . . ,310-9 Stabilizer bar, removing and installing . . . . 310-22

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Front ~us~ensionl
Spread steering knuckle slot in
tool
31 2 200.
pinch collarwith BMW special
4 Worlting in engine compartment at strut tower:
- If applicable, disconnect plug connector at top of strut for
Electronic Damper Control and remove cap from cable.
Remove upper strut bearing mounting fasteners
(arrows).
WARNING-
Do not remove centerstrut retaining nut.
4 Use lever to push down on wheel hub. Tilt strut outward
NOTE-
Use masking tape to protect fender arch from possible dam-
age.

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31 0-1 8
I~ront Suspension Tension strut bushing, replacing
- Raise car and remove wheel.
WARNING-
Make sure that the caris firmly supported on jack stands de-
signed for the purpose. Place jack stands underneath struc-
tural chassis points. Do
not place jack stands under
suspension parts.
- Remove tension strut from car as described earlier.
- Using a service press and appropriate press tools (BMW
special tools 31 2 26112621263 or equivalent), press bushing
out of tension strut.
4 Clean bushing bore and press in new bushing while aligning
mark on bushing with
rnarlt on tension strut (arrows).
CAUTION-
To avoid damaging the new bushing, press only on the outer
steel sleeve during installation.
- Press bushing in so it protrudes equally from both sides of
tension strut.
- Install tension strut as described earlier.
CAUTION-
Tighten the tension strut bushing through-bolt to its final
torque only with car on the ground and the suspension nor-
mally loaded as described earlier.
The front wheel bearings are permanently sealed and require
no maintenance. The bearing is integral with the wheel hub.
The wheel bearing and hub assembly is bolted to the steering
knuckle.
- Raise car and remove front wheel
WARNING-
Make sure that the car is firmly supported on jack stands de-
signed for the purpose. Place jack stands underneath struc-
tural chassis points. Do not place
jack stands under
susoension Darts.
- Unbolt brake caliper and hang to side with stiff wire. Do not
disconnect bralte hose. Remove bralte disc. See
340
Brakes.

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31 0-20
Front Suspension
Counterhold strut tube
nut. pinch
bolt (arrow) while loosening
4 Spread steering ltnuckle pinch collar with BMW special tool
31 2 200 to release strut tube.
- Pull steering knuckle down so that strut tube slides up far
enough to gain access to wheel bearing hub mounting bolts.
Carefully pry out dust cover on back side of bearing while
noting location
(arrow) of cover.

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31 0-21
Front Suspension
4 Remove four bearing hub mounting bolts (arrows) and tap
hub assembly out of steering knuckle.
4 Before installing new wheel bearing and hub assembly, be
sure hub and steering knuckle sealing surfaces are free of
dirt and grease.
- Installation is reverse of removal.
Replace hub mounting bolts.
Use new self-locking nuts at steering tie rod and stabilizer
link.
Tightening
torques
Road wheel lugs to hub 120i-10 Nm (89i-7ft-lb)
Stabilizer link to stabilizer bar
Steering tie rod to steering
ltnuckle
Tension strut to steering
knucltie
Wheel bearing hub to steering
Itnucltle (replace bolts)
65 Nm (48 ft-lb)
65
Nm (48 it-lb)
80 Nm (59 ft-lb)
1
lo Nm (81 ft-lb)

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320-1 0
Steering and Wheel Alignment
Steering column
components
1. Steering lock
2. Lower steering shafl
3. Horizontal drive motor
4. Longitudinal adjusting drive
shafl
5. Steering column support
6. Vertical adjusting drive shafl
7. Vertical drive motor
8. Lower support ring for steering
angle sensor
9. Upper support ring for steering
angle sensor
10. Steering angle sensor
11. Upper steering shafl
12. Steering shafl bearing
13. Bearing inner sleeve
14. Circlip
15. Collar
16. Steering wheel mounting bolt
Steering column trim, removing and
replacing
- Tilt steering column down and extend fully.
- Remove plastic retaining screw from upper trim cover,
4 Push in sides of upper trim cover (arrow) to release from
lower trim. Pull back and up on upper trim.

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I Steering and Wheel Alignment
With ignition key in ON position (60" from LOCKED):
- Disconnect ring antenna harness connector.
Insert
BMW special tool 32 3 110 or a thin piece of stiff wire
into opening (arrow) in lock cylinder.
Turn tool forward (clockwise) approximately 90" and re-
move lock cylinder.
* Reinstallation is reverse of removal.
NOTE-
Using the valet ley during this procedure will provide better
access to lock opening.
Steering column lock, removing and
installing
- Disconnect negative (-) cable from battery.
CAUTIO&
Prior to disconnecting the battery, read the battery discon-
nection cautions given
in 001 General Cautions and
Warnings.
- Remove steering wheel as described earlier.
- Remove steering column trim panels as described earlier.
- Remove collar and circlip from steering shaft. Refer to illus-
tration of steering column components.
4 Pry steering shaft bearing with inner sleeve out of lock hous-
ing.
- Remove ring antenna as described earlier.
- Remove column switches. See 612 Switches.
< Automatic transmission models: Loosen and disconnect in-
terloclc shift cable (arrow) from ignition lock assembly.