Important!

This replacement procedure can be used for:
MERCEDES-BENZ A-Class (W168) A 160 (168.033, 168.133)

The steps may slightly vary depending on the car design.

How to change Front Suspension Arm on MERCEDES-BENZ A W168 TUTORIAL | AUTODOC

Replacement: front lower arm – Mercedes W168. List of the tools you'll need:

                        Wire brush
                      
                        WD-40 spray
                      
                        Brake cleaner
                      
                        Copper grease
                      
                        Combination spanner #19
                      
                        Drive socket # E14
                      
                        Wheel impact socket #17
                      
                        Ratchet wrench
                      
                        Torque wrench
                      
                        Hammer
                      
                        Flat Screwdriver
                      
                        Crow bar
                      
                        Hydraulic transmission jack
                      
                        Wheel chock

All the parts you need to replace – Control Arm for A-Class (W168) and other MERCEDES-BENZ models

MERCEDES-BENZ A-Class (W168) A 160 (168.033, 168.133)

Replacement: front lower arm – Mercedes W168. 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.

Please note: all work on the car – Mercedes W168 – should be done with the engine switched off.

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.

Replacement: front lower arm – Mercedes W168. Tip:

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

Remove the wheel.
Step 6

Clean the fastener connecting the ball joint to the steering knuckle.Use a wire brush.Use WD-40 spray.
Step 7

Unscrew the ball joint fastening to the steering knuckle.Use a combination spanner #19.
Step 8

Disconnect the ball joint from the steering knuckle.Use a crowbar. Use a hammer.
Step 9

Clean the fasteners connecting the control arm to the subframe.Use a wire brush.Use WD-40 spray.

Step 10

Unscrew the front arm fastener.Use a drive socket #E14.Use a ratchet wrench.
Step 11

Remove the front fastener of the control arm.
Step 12

Unscrew the rear fastener connecting the control arm to the subframe.Use a drive socket #E14.Use a ratchet wrench.
Step 13

Remove the rear fastener of the control arm.Use a flat screwdriver.
Step 14

Remove the arm.Use a crowbar.
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 W168. AUTODOC recommends:

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

Install the front fastener of the arm.
Step 18

Install the rear fastener of the control arm.Use a hammer.
Step 19

Screw the rear arm fastener.Use a drive socket #E14.Use a ratchet wrench.
Step 20

Connect the ball joint to the steering knuckle.Use a crowbar.
Step 21

Tighten the ball joint fastener. Use a combination spanner #19.Use a torque wrench.Tighten it to 70 Nm torque.
Step 22

Support the arm.Use a hydraulic transmission jack.
Step 23

Tighten the front fastener connecting the control arm to the subframe.Use a drive socket #E14.Use a torque wrench.Tighten it to 65 Nm torque.
Step 24

Tighten the rear fastener of the control arm.Use a drive socket #E14.Use a torque wrench.Tighten it to 75 Nm torque.
Step 25

Remove the support from under the arm.

AUTODOC recommends:

Replacement: front lower arm – Mercedes W168. 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

Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 28

Clean the brake disk surface.Use a brake cleaner.

AUTODOC recommends:

Replacement: front lower arm – Mercedes W168. After applying the spray, wait a few minutes.
Step 29

Install the wheel.

Replacement: front lower arm – Mercedes W168. Tip from AUTODOC experts:

To avoid injury, hold up the wheel when screwing in the fastening bolts.
Step 30

Screw in the wheel bolts.Use wheel impact socket #17.
Step 31

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 32

Remove the jacks and chocks.

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