Important!

This replacement procedure can be used for:
MERCEDES-BENZ E-Class Saloon (W124) E 300 D (124.131), MERCEDES-BENZ E-Class Saloon (W124) E 200 (124.019), MERCEDES-BENZ E-Class Saloon (W124) E 220 (124.022), MERCEDES-BENZ E-Class Saloon (W124) E 280 (124.029), MERCEDES-BENZ E-Class Saloon (W124) E 200 D (124.120), MERCEDES-BENZ E-Class Saloon (W124) E 250 Turbo-D (124.128), MERCEDES-BENZ E-Class Saloon (W124) E 300 Turbo-D 4-matic (124.333), MERCEDES-BENZ E-Class Saloon (W124) E 300 Turbo-D (124.133), MERCEDES-BENZ E-Class Saloon (W124) E 300 4-matic (124.230) … View more

The steps may slightly vary depending on the car design.

How to change front suspension arm on MERCEDES W124 [TUTORIAL AUTODOC]

Alternative products

Suspension arm

Replacement: front lower arm – Mercedes W124. List of the tools you'll need:

                      Wire brush
                    
                      WD-40 spray
                    
                      All-purpose cleaning spray
                    
                      Ceramic grease
                    
                      Torque wrench
                    
                      Combination spanner #18
                    
                      Combination spanner #22
                    
                      Drive socket # 13
                    
                      Drive socket # 19
                    
                      Drive socket # 22
                    
                      Wheel impact socket #17
                    
                      Ratchet wrench
                    
                      Tap wrench
                    
                      Hammer
                    
                      Pin punch
                    
                      Crow bar
                    
                      Rubber mallet
                    
                      Strut spring compressor
                    
                      Hydraulic transmission jack
                    
                      Wheel chock

Buy tools

Replacement: front lower arm – Mercedes W124. AUTODOC experts recommend:

The replacement procedure is identical for the left and right lower control arms.
All work should be done with the engine stopped.

Replacement: front lower arm – Mercedes W124. Recommended sequence of steps:

Step 1

Secure the wheels with chocks.

Step 2

Loosen the wheel bolts. Use wheel impact socket #17. Use a tap wrench.
Step 3

Raise the car.

Replacement: front lower arm – Mercedes W124. AUTODOC recommends:
If you are using a jack, make sure it rests on a flat surface without any unevenness.Be sure to additionally secure the car with jack stands.
Step 4

Unscrew the wheel bolts.

AUTODOC recommends:
To avoid injury, hold up the wheel when unscrewing the bolts.
Step 5

Remove the wheel.
Step 6

Install the coil spring compressor on the coil spring.

Replacement: front lower arm – Mercedes W124. Professionals recommend:
Use adapters and jaws of the appropriate size.The sping coils should be securely fixed with the coil spring compressor.Use high quality coil spring compressors.
Step 7

Compress the spring.

AUTODOC recommends:
Be careful. The compressed spring is powerful and can cause injury if it comes loose.
Step 8

Clean all joints of the arm. Use a wire brush. Use WD-40 spray.
Step 9

Make marks on the camber bolts.
Step 10

Unscrew the rear fastener of the control arm. Use a combination spanner #22. Use a drive socket #22. Use a ratchet wrench.
Step 11

Unscrew the front fastener of the control arm. Use a combination spanner #22. Use a drive socket #22. Use a ratchet wrench.
Step 12

Unscrew the fasteners connecting the anti-roll bar bracket to the control arm. Use a drive socket #13. Use a ratchet wrench.
Step 13

Detach the anti-roll bar from the control arm.
Step 14

Unscrew the fastener connecting the ball joint to the steering knuckle. Use a combination spanner #18. Use a drive socket #19. Use a ratchet wrench.
Step 15

Remove the fastening bolt.
Step 16

Disconnect the ball joint from the steering knuckle.
Step 17

Remove the fastening bolts. Use a pin punch. Use a hammer.
Step 18

Remove the coil spring together with the coil spring compressor.

Replacement: front lower arm – Mercedes W124. Tip from AUTODOC experts:
While the spring is compressed, do not do any operations on it.
Step 19

Remove the control arm. Use a crowbar.
Step 20

Clean the suspension arm mounting seats. Use a wire brush. Use all-purpose cleaning spray.
Step 21

Install the new control arm.

AUTODOC recommends:
During the installation process, use only new bolts and nuts.
Step 22

Connect the ball joint to the steering knuckle.
Step 23

Install the fastening bolt.
Step 24

Support the control arm. Use a hydraulic transmission jack.
Step 25

Install the spring together with the compressor.

Replacement: front lower arm – Mercedes W124. Tip:
Make sure that the coil spring is correctly positioned in its mounting seats.
Step 26

Position the control arm according to its mounting holes. Use a rubber mallet.
Step 27

Install the fastening bolts. Use a rubber mallet.
Step 28

Remove the support from under the control arm.

Step 29

Adjust the position of the camber bolts according to the marks.

Step 30

Support the steering knuckle. Use a hydraulic transmission jack.

AUTODOC recommends:
For tightening the fasteners correctly, you have to jack up the suspension components to their working position.
Step 31

Tighten the rear fastener of the control arm. Use a combination spanner #22. Use a drive socket #22. Use a torque wrench. Tighten it to 120 Nm torque.
Step 32

Tighten the front fastener of the arm. Use a combination spanner #22. Use a drive socket #22. Use a torque wrench. Tighten it to 120 Nm torque.
Step 33

Tighten the ball joint fastener. Use a combination spanner #18. Use a drive socket #19. Use a torque wrench. Tighten it to 75 Nm torque.
Step 34

Remove the support from under the steering knuckle.

AUTODOC recommends:
Mercedes W124 – Do not lower the transmission jack sharply to avoid damaging components and mechanisms of the car.
Step 35

Connect the anti-roll bar to the control arm. Use a crowbar.
Step 36

Tighten the fasteners connecting the anti-roll bar bracket to the control arm. Use a drive socket #13. Use a torque wrench. Tighten it to 20 Nm torque.
Step 37

Decompress the spring.
Step 38

Remove the coil spring compressor.
Step 39

Clean the wheel rim mounting seat. Use a wire brush. Use all-purpose cleaning spray.
Step 40

Treat the surface where the brake disc contacts the wheel rim. Use ceramic grease.
Step 41

Install the wheel.

Replacement: front lower arm – Mercedes W124. AUTODOC experts recommend:
To avoid injury, hold up the wheel when screwing in the fastening bolts.
Step 42

Screw in the wheel bolts. Use wheel impact socket #17. Use a ratchet wrench.
Step 43

Lower the car and working in a cross order, tighten the wheel bolts. Use wheel impact socket #17. Use a torque wrench. Tighten it to 110 Nm torque.
Step 44

Remove the jacks and chocks.

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