Important!

This replacement procedure can be used for:
MERCEDES-BENZ C-Class Saloon (W204) C 180 CDI (204.000), MERCEDES-BENZ C-Class Saloon (W204) C 300 CDI 4-matic (204.092), MERCEDES-BENZ C-Class Saloon (W204) C 350 (204.057), MERCEDES-BENZ C-Class Saloon (W204) C 350 4-matic (204.088), MERCEDES-BENZ C-Class Saloon (W204) C 350 CDI (204.023), MERCEDES-BENZ C-Class Saloon (W204) C 63 AMG (204.077), MERCEDES-BENZ C-Class Saloon (W204) C 230 (204.052), MERCEDES-BENZ C-Class Saloon (W204) C 220 CDI (204.002), MERCEDES-BENZ C-Class Saloon (W204) C 250 CGI (204.047), MERCEDES-BENZ C-Class Saloon (W204) C 300 (204.054), MERCEDES-BENZ C-Class Saloon (W204) C 220 CDI (204.008), MERCEDES-BENZ C-Class Saloon (W204) C 63 AMG DR 520, MERCEDES-BENZ C-Class Saloon (W204) C 220 CDI 4-matic (204.084), MERCEDES-BENZ C-Class Saloon (W204) C 220 CDI (204.002), MERCEDES-BENZ C-Class Saloon (W204) C 180 CGI (204.031), MERCEDES-BENZ C-Class Saloon (W204) C 300 (204.055), MERCEDES-BENZ C-Class Saloon (W204) C 300 4-matic (204.080) … View more

The steps may slightly vary depending on the car design.

How to change rear suspension arm on MERCEDES W204 [TUTORIAL AUTODOC]

Alternative products

Suspension arm

Replacement: rear lower arm – Mercedes W204. Tools you might need:

                      Wire brush
                    
                      WD-40 spray
                    
                      Brake cleaner 
                    
                      Ceramic grease
                    
                      Copper grease 
                    
                      Torque wrench
                    
                      Combination spanner #18
                    
                      Drive socket # 10 
                    
                      Drive socket # 18 
                    
                      Torx bit E10
                    
                      Torx bit E14
                    
                      XZN socket bit # 12
                    
                      Wheel impact socket #17
                    
                      Ratchet wrench
                    
                      Flat screwdriver
                    
                      Hydraulic transmission jack
                    
                      Wheel chock

Buy tools

Replacement: rear lower arm – Mercedes W204. Tip from AUTODOC:

The replacement procedure is identical for the left and right lower control arms.
Please note: all work on the car – Mercedes W204 – should be done with the engine switched off.

Carry out replacement in the following order:

Step 1

Secure the wheels with chocks.

Step 2

Loosen the wheel mounting bolts. Use wheel impact socket #17.
Step 3

Raise the car.

Replacement: rear lower arm – Mercedes W204. AUTODOC experts recommend:
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:
Warning! To avoid injury, hold the wheel while unscrewing the fastening bolts. Mercedes W204
Step 5

Remove the wheel.
Step 6

Unclip the fasteners and remove the suspension arm plastic cover. Use a flat screwdriver.
Step 7

Unscrew the fasteners of the underbody plastic cover. Use a drive socket #10. Use a ratchet wrench.
Step 8

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

Unscrew the fastener that connects the suspension arm to the stub axle. Use a combination spanner #18. Use XZN #12. Use a ratchet wrench.
Step 10

Remove the fastening bolt.
Step 11

Clean the subframe bracket fasteners. Use a wire brush. Use WD-40 spray.
Step 12

Support the subframe. Use a hydraulic transmission jack.
Step 13

Unscrew the subframe bracket fasteners. This is necessary to access the upper fastening bolt of the suspension arm. Use Torx E10. Use Torx E14. Use a ratchet wrench.
Step 14

Remove the fastening bolts.
Step 15

Remove the subframe bracket.
Step 16

Unscrew the fastener connecting the control arm to the subframe. Use a combination spanner #18. Use XZN #12. Use a ratchet wrench.
Step 17

Remove the fastening bolt.
Step 18

Remove the arm.
Step 19

Clean the suspension arm mounting seats. Use a wire brush. Use WD-40 spray.
Step 20

Clean the subframe bracket mounting seats. Use a wire brush. Use WD-40 spray.
Step 21

Install a new arm.

Replacement: rear lower arm – Mercedes W204. Professionals recommend:
During the installation process, use only new bolts and nuts.
Step 22

Install the fastening bolts.
Step 23

Install the subframe bracket.
Step 24

Install the fastening bolts.
Step 25

Tighten the subframe bracket fasteners. Use Torx E10. Use a torque wrench. Tighten it to 28 Nm torque.
Step 26

Tighten the subframe bracket fasteners. Use Torx E14. Use a torque wrench. Tighten it to 80 Nm torque.+90°
Step 27

Remove the support from under the subframe.

AUTODOC recommends:
Replacement: rear lower arm – Mercedes W204. Tip:
Step 28

Support the rear 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 29

Tighten the fastener that connects the suspension arm to the stub axle. Use a combination spanner #18. Use XZN #12. Use a torque wrench. Tighten it to 50 Nm torque.+90°
Step 30

Tighten the fastener connecting the control arm to the subframe. Use a drive socket #18. Use XZN #12. Use a torque wrench. Tighten it to 50 Nm torque.+90°
Step 31

Remove the support from under the rear knuckle.

AUTODOC recommends:
Mercedes W204 – Do not lower the transmission jack sharply to avoid damaging components and mechanisms of the car.
Step 32

Treat the subframe bracket fasteners. Use copper grease.
Step 33

Treat all joints of the arm. Use copper grease.
Step 34

Screw in the fasteners of the underbody plastic cover. Use a drive socket #10. Use a ratchet wrench.
Step 35

Install the suspension arm plastic cover.

Step 36

Clean the wheel rim mounting seat. Use a wire brush.
Step 37

Treat the surface where the brake disc contacts the wheel rim. Use ceramic grease.
Step 38

Clean the brake disk surface. Use a brake cleaner.

AUTODOC recommends:
Replacement: rear lower arm – Mercedes W204. After applying the spray, wait a few minutes.
Step 39

Install the wheel.

AUTODOC recommends:
Warning! To avoid injury, hold the wheel while screwing in the fastening bolts on the car. Mercedes W204
Step 40

Screw in the wheel bolts. Use wheel impact socket #17.
Step 41

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 130 Nm torque.
Step 42

Remove the jacks and chocks.

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