Important!

This replacement procedure can be used for:
MERCEDES-BENZ C-Class Saloon (W203) C 240 (203.061) … View more

The steps may slightly vary depending on the car design.

How to change front suspension arm on MERCEDES-BENZ W203 C-Class [TUTORIAL AUTODOC]

All the parts you need to replace – Control Arm for C-Class Saloon (W203) and other MERCEDES-BENZ models

Link Set, wheel suspension

Rod / Strut, wheel suspension

Track Control Arm

MERCEDES-BENZ C-Class Saloon (W203) C 240 (203.061)

Replacement: front lower arm – Mercedes W203. Tools you might need:

                        Wire brush
                      
                        WD-40 spray
                      
                        Brake cleaner
                      
                        Copper grease
                      
                        Torque wrench
                      
                        Combination spanner #21
                      
                        Combination spanner #22
                      
                        Drive socket # 8 
                      
                        Drive socket # 21
                      
                        Wheel impact socket #17
                      
                        Ratchet wrench
                      
                        Ball joint puller
                      
                        Hydraulic transmission jack
                      
                        Wheel chock

Buy tools

Replacement: front lower arm – Mercedes W203. AUTODOC recommends:

The replacement procedure is identical for the left and right lower control arms.
Please note: all work on the car – Mercedes W203 – 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 front of the car and secure on supports.
Step 4

Unscrew the wheel bolts.

AUTODOC recommends:

Warning! To avoid injury, hold the wheel while unscrewing the fastening bolts. Mercedes W203
Step 5

Remove the wheel.
Step 6

Undo the fasteners of the oil pan lower cover.Use a drive socket #8.Use a ratchet wrench.
Step 7

Remove the oil pan cover.
Step 8

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

AUTODOC recommends:

Replacement: front lower arm – Mercedes W203. After applying the spray, wait a few minutes.
Step 9

Unscrew the fastener connecting the control arm to the subframe.Use a combination spanner #21.Use a drive socket #21.Use a ratchet wrench.
Step 10

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

AUTODOC recommends:

Replacement: front lower arm – Mercedes W203. After applying the spray, wait a few minutes.
Step 11

Unscrew the fastener connecting the ball joint to the steering knuckle.Use a combination spanner #21.
Step 12

Disconnect the ball joint from the steering knuckle.Use a ball joint puller.
Step 13

Remove the fastening bolt.
Step 14

Remove the arm.
Step 15

Clean the mounting seats and the thread of the suspension arm.Use a wire brush.Use WD-40 spray.
Step 16

Install a new arm.

Replacement: front lower arm – Mercedes W203. Professionals recommend:

During the installation process, use only new bolts and nuts.Do not damage the ball joint cover.
Step 17

Install the fastening bolt.
Step 18

Connect the ball joint to the steering knuckle.
Step 19

Screw the fastener connecting the ball joint to the steering knuckle.Use a combination spanner #22.
Step 20

Support the arm.Use a hydraulic transmission jack.
Step 21

Screw the fastener connecting the control arm to the subframe.Use a combination spanner #21.Use a drive socket #21.Use a ratchet wrench.
Step 22

Tighten the rear fastener connecting the arm to the body subframe.Use a combination spanner #21.Use a drive socket #21.Use a torque wrench.Tighten it to 76 Nm torque.
Step 23

Tighten the ball joint fastener.Use a combination spanner #22.Use a torque wrench.Tighten it to 65 Nm torque.
Step 24

Remove the support from under the arm.

AUTODOC recommends:

Replacement: front lower arm – Mercedes W203. Lower the transmission jack smoothly, without jerks, to avoid damaging components and mechanisms.
Step 25

Treat all joints of the arm.Use copper grease.
Step 26

Reinstall the oil pan lower cover.
Step 27

Tighten the fasteners of the oil pan lower cover.Use a drive socket #8.Use a ratchet wrench.
Step 28

Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 29

Clean the brake disk surface.Use a brake cleaner.

AUTODOC recommends:

Replacement: front lower arm – Mercedes W203. After applying the spray, wait a few minutes.
Step 30

Install the wheel.

AUTODOC recommends:

Warning! To avoid injury, hold the wheel while screwing in the fastening bolts on the car. Mercedes W203
Step 31

Screw in the wheel bolts.Use wheel impact socket #17.
Step 32

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 120 Nm torque.
Step 33

Remove the jacks and chocks.

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