2001 BMW 525i Final drive

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330-27
Rear ~uspensionl
- If equipped, remove ride height sensor connectors.
Support final drive unit from below using transmission jack
(BMW special tools 00
2 030 and 33 4 390 or equivalent).
NOTE-
Special tool 33 4 390 will need modifications to cradle the ii-
nal drive properly.
4 Remove right and left suspension trim panels (arrow)
4 Remove right and left lower strut mount bolts (arrow)
Remove rear suspension
subframe by removing 4 mounting
bolts (arrows).
Carefully lower rear suspension
subframe away from body to
remove.

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330-28
Rear Suspension
4 To install, jack subframe into position. Install and tighten sub-
frame mounting bolts. Note that on each bolt, rubber-coat-
ed detent plate
(arrow) must be installed at rear in driving
direction.
Tightening torques
Rear
subframe to body (M12) 163 Nm (120 ft-lb)
- Remainder of installation is reverse of removal, noting the fol-
lowing.
Make sure long lower strut bushing fits in hole in wheel
bearing carrier.
111 0 Tighten suspension arm and shoclc absorber fasteners to
502330036 final torque only afler vehicle has been lowered and sus-
pension has settled.
Have car professionally aligned when job is complete
Tightening torques
ABS pulse sensor to wheel bearing carrier 8 Nrn (6 ft-lb)
Brake rotor to hub
16 Nm (12 ft-lb)
Driveshaft
CV joint to final drive flange
- MI0 (Tow bolts) 70 Nm (51 ft-lb)
MB (compression nut) 32
Nm (24 ft-lb)
Rear brake pad
carrler (caliper) to wheel 65 Nm (48 ft-lb)
bear~ng carrler
Rear strut to
wheel bearlng carrler 127 Nm (94 ft-lb)
Road wheel to hub
120210Nrn
(89 57 ft-lb)
Rear axle assembly, removing and
installing (Sport Wagon models)
Incaseof damage to thesubframe, or if apressed-in bushing is
worn, remove
subframe by removing complete axle assembly.
In Sport Wagon models with conventional coil spring, lower
subframe slowly, making sure rear springs stay on spring
seats.
In models with air suspension
(EHC), disable the air supply
pump, deflate the air springs and disconnect them from the
wheel carriers before lowering the subframe.
- Raise car and remove rear wheels.
WARNING-

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Rear Suspension
- Remove exhaust system. See 180 Exhaust System.
- Detach driveshaft from differential. See 260 Driveshaft.
- Remove brake caliper and brake disc. Hang brake caliper
aside with stiff wire. Do not disconnect brake fluid hose. See
340 Brakes.
- Remove left and right ABS sensors from wheel bearing car-
riers.
Disconnect parking brake cable from brake shoe expander.
See 340 Brakes.
Remove heat shield from above driveshaft
If equipped, remove ride height sensor connectors
CAUTION-
Models with air springs: Disable air supply pump by discon-
necting electrical plug before performing any repairs. Pump is
locatedbeneath a coverunder
thespare tire in the floorof the
carqo compartment.
Models with air springs: Loosen compressed air pipes (ar-
rows) at air distribution assembly to release system pres-
sure.
WARNING -
Vehicle will lower when the air pipes are opened. 1
- Working underneath rear suspension, lift wheel bearing car-
rier to relieve rear spring tension. Then unbolt air spring
mounting bolt from seat on wheel bearing carrier.
4 Support final drive unit from below using transmission jack
(BMW special tools 00 2 030 and 33 4 390 or equivalent).
NOTE-
Special tool 33 4 390 will need modifications to cradle the fi-
nal drive properly
4 Remove right and left suspension trim panels (arrow),

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Rear Suspension
- Remainder of installation is reverse of removal, noting the fol-
lowing.
Tighten suspension arm and shock absorber fasteners to
final torque only afler vehicle has been lowered and sus-
pension has settled.
Tightening torques
ABS pulse sensor to wheel bearing carrier 8
Nrn (6 ft-lb)
Air line connection 2 Nrn (18 in-lb)
Brake rotor to hub 16
Nrn (12 ft-lb)
Driveshaft
CV joint to final drive flange
- MI0 (Torx bolts) 70
Nrn (51 ft-lb)
- MB (compression nut) 32 Nrn (24 ft-lb)
Rear
brake pad carrier (caliper) to wheel 65
Nrn (48 ft-lb)
bearing carrier
Road wheel to hub
120ilO Nrn
(89 i-7 ft-lb)
Rear subframe mounting bushings,
removing and installing
- Remove rear subframe mounting bolts as described earlier.
Lower
subframe approximately 40 - 45 mm (1 -2 in).
4 Install BMW special tools 33 4 140,33 4 151,33 4 154,33 4
155,33 4 156 as shown.
Use hot air gun with a maximum output temperature of
600°C (1100" F) to heat bushing area of subframe for no
more than
2 minutes. Remove rubber mount from sub-
frame.
CAUTION-
Aluminum suspension parts may be severely damaged
witli intense heat
* Heating for 2 minutes with the recommended heat
source is intended to
keep the temperature of the alu-
minum
parts below the safety threshold of 80°C
(1 76°F). .

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33UFinal Drive
General ........................... ,331 -2 Drive Axles ....................... 331 -1 4
Special tools
........................ ,331 -2 Drive axle assembly ................. 331-14
Aluminum suspension components
...... ,331-4 Drive axle, removing and
installing (sedan)
.................... 331-14 ........................ Final Drive ,331 -5
Drive axle, removing
........... ...... Final drive, removing and installing ,331-5 and (Sport Wagon) 331-15
...................... Differential oil level, checking ........... ,331-6 CV joint boots 331-17 Final drive in~ut shaft seal, replacing ..... ,331-7 .
Final drive oitput shaft seals, replacing . . ,331-10
Final drive cover, removing and installing ,331-12
Final drive mounts, replacing .......... ,331-12

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331-2
Final Drive
This repair group covers removal and repair informat~on for
the final drive (differential), axle shafts.
CV joints, CV joint
boots, and final drive seal replacement.
Internal repairs of the differential assembly are not covered in
this manual.
Special tools
BMW recommends some special tools for the removal of the
drive axles as well as the installation of rear differential input
and output drive flange seals. Some common pullers and
drifts can often be substituted for these tools.
4 Drive flange holder
(Tool No. BMW
2 30 020)
< Drive flange puller
(ToolNo.BMW31 2101 131 2102131 2103131 2104)
< Drive pinion set
(Tool No. BMW 33 1 340)
4 Clamp~ng tool set
(ToolNo.BMW332101 13321021332103)

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Final Drive
4 Output shaft tool set
(ToolNo.
BMW332111 1332114/332115/3321161
33211713321181332119)
4 Trailing arm tool set
11 (Tool NO BMW 33 3 331 I 33 3 332 1 33 3 333 133 3 334)
4 Final drive mount set
(ToolNo.
BMW334151 /334152/334153/334154/
3341551334156133415713341581334159)
< Differential mount press set
(Tool
No.BMW334161 1334162133416413341651
33 4 166)
33 4 161
Q Differential mount press set
(ToolNo.
BMW334171 /334172/334173/3341 174)
. .
33 4 181 4 Differential mount press set
33 (Tool No. BMW334181 133418213341831334184)
Support tube set
(ToolNo.BMW334191133419213341931334194)
33 4 192
33 4 191

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331-4
Final Drive
4 Final drive output shaft seal tool
(Tool No.
BMW 33 4 250)
4 Pulling set
(Tool No.
BMW 33 4 401 / 33 4 402 / 33 4 403 133 4 404 /
33 4 405 / 33 4 406)
Aluminum suspension components
In order to reduce vehicle weight, aluminum suspension com-
ponents are
~sed in some models. A tesl wlh a magnet wi.1
eas'ly reveal lhe metal Lseo. If working with a umin~m com-
ponents, be sure to read and follow the cautions below.
CAUTIOI\C
Due to the chemical and corrosion characteristics of alumi-
num, do not bring into contact with battery acid.
Do not use wire brushes with brass or iron bristles.
Only use brushes with stainless steel bristles.
Do not expose to flying sparks from grinding/cutting op-
erations.
Do not subject to steel welding splashes.
Do not expose to temperatures over
80°C (176"F),
even for short periods. Temperatures in painting facili-
ties are not a problem.