Important!

This replacement procedure can be used for:
MERCEDES-BENZ B-Class (W245) B 170 NGT (245.233), MERCEDES-BENZ B-Class (W245) B 180 NGT (245.233), MERCEDES-BENZ B-Class (W245) B 180 CDI (245.207), MERCEDES-BENZ B-Class (W245) B 200 CDI (245.208), MERCEDES-BENZ B-Class (W245) B 170 (245.232), MERCEDES-BENZ B-Class (W245) B 200 TURBO (245.234), MERCEDES-BENZ B-Class (W245) B 150 (245.231), MERCEDES-BENZ B-Class (W245) B 160 (245.231), MERCEDES-BENZ B-Class (W245) B 180 (245.232), MERCEDES-BENZ B-Class (W245) B 200 CDI (245.208) … View more

The steps may slightly vary depending on the car design.

How to change front suspension arm on MERCEDES-BENZ B200 (W245) [TUTORIAL AUTODOC]

All the parts you need to replace – Control Arm for B-Class (W245) and other MERCEDES-BENZ models

Alternative products

Suspension arm

Replacement: front lower arm – Mercedes W245. Tools you might need:

                      Wire brush
                    
                      WD-40 spray
                    
                      Brake cleaner 
                    
                      Copper grease 
                    
                      Combination spanner #21
                    
                      Combination spanner #22
                    
                      Drive socket # 10 
                    
                      Drive socket # 14 
                    
                      Drive socket # E18 
                    
                      Wheel impact socket #H12
                    
                      Ratchet wrench
                    
                      Torque wrench
                    
                      Crow bar
                    
                      Ball joint puller
                    
                      Hydraulic transmission jack
                    
                      Wheel chock

Buy tools

Replacement: front lower arm – Mercedes W245. AUTODOC recommends:

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 W245. Recommended sequence of steps:

Step 1

Secure the wheels with chocks.
Step 2

Loosen the wheel mounting bolts. Use wheel impact socket #H12.
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 W245
Step 5

Remove the wheel.
Step 6

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

Replacement: front lower arm – Mercedes W245. AUTODOC experts recommend:
After applying the spray, wait a few minutes.
Step 7

Unscrew and remove the wheel arch cover fasteners. 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.

AUTODOC recommends:
Replacement: front lower arm – Mercedes W245. After applying the spray, wait a few minutes.
Step 9

Unscrew the front arm fastener. Use a combination spanner #21. Use a drive socket #E18. Use a ratchet wrench.
Step 10

Remove the front fastener of the control arm.
Step 11

Unscrew the rear fastener connecting the control arm to the subframe. Use a combination spanner #21. Use a drive socket #E18. Use a ratchet wrench.
Step 12

Unscrew the ball joint fastening to the steering knuckle. Use a combination spanner #21.
Step 13

Disconnect the lower arm from the steering knuckle. Use a ball joint puller.
Step 14

Remove the rear fastener of the control arm.

Step 15

Remove the arm.
Step 16

Clean the mounting seats and the thread of the suspension arm. Use a wire brush. Use WD-40 spray.
Step 17

Install a new arm. Use a crowbar.

Replacement: front lower arm – Mercedes W245. Tip:
During the installation process, use only new bolts and nuts.Do not damage the ball joint cover.
Step 18

Install the rear fastener of the control arm.
Step 19

Connect the lower arm to the steering knuckle.
Step 20

Install the front fastener of the arm.
Step 21

Support the arm. Use a hydraulic transmission jack.
Step 22

Tighten the fasteners of the ball joint. Use a combination spanner #22. Use a torque wrench. Tighten it to 50 Nm torque.+60°

AUTODOC recommends:
Important! Be sure to use new fasteners.
Step 23

Tighten the front fastener connecting the control arm to the subframe. Use a combination spanner #21. Use a drive socket #E18. Use a torque wrench. Tighten it to 120 Nm torque.+90°

AUTODOC recommends:
Important! Be sure to use new fasteners.
Step 24

Tighten the rear fastener connecting the arm to the body subframe. Use a combination spanner #21. Use a drive socket #E18. Use a torque wrench. Tighten it to 120 Nm torque.+90°

AUTODOC recommends:
Important! Be sure to use new fasteners.
Step 25

Remove the support from under the arm.

AUTODOC recommends:
Replacement: front lower arm – Mercedes W245. Lower the transmission jack smoothly, without jerks, to avoid damaging components and mechanisms.
Step 26

Treat all joints of the arm. Use copper grease.
Step 27

Tighten the fasteners of the ball joint. Use a drive socket #14. Use a torque wrench. Tighten it to 55 nm torque.
Step 28

Treat all joints of the arm. Use copper grease.
Step 29

Install and tighten the wheel arch cover fasteners. Use a drive socket #10. Use a ratchet wrench.
Step 30

Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 31

Clean the brake disk surface. Use a brake cleaner.

Replacement: front lower arm – Mercedes W245. Tip from AUTODOC:
After applying the spray, wait a few minutes.
Step 32

Install the wheel.

Replacement: front lower arm – Mercedes W245. Professionals recommend:
To avoid injury, hold up the wheel when screwing in the fastening bolts.
Step 33

Screw in the wheel bolts. Use wheel impact socket #H12.
Step 34

Lower the car and working in a cross order, tighten the wheel bolts. Use wheel impact socket #H12. Use a torque wrench. Tighten it to 130 Nm torque.
Step 35

Remove the jacks and chocks.

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