Important!

This replacement procedure can be used for:
MERCEDES-BENZ SL (R129) 280 (129.058), MERCEDES-BENZ SL (R129) 300 SL (129.060), MERCEDES-BENZ SL (R129) 300 SL-24 (129.061), MERCEDES-BENZ SL (R129) 320 (129.063), MERCEDES-BENZ SL (R129) 500 (129.067), MERCEDES-BENZ SL (R129) 500 SL (129.066), MERCEDES-BENZ SL (R129) 600 (129.076), MERCEDES-BENZ SL (R129) 60 AMG (129.067), MERCEDES-BENZ SL (R129) 280 (129.059), MERCEDES-BENZ SL (R129) 320 (129.064), MERCEDES-BENZ SL (R129) 500 (129.068), MERCEDES-BENZ SL (R129) 55 AMG, MERCEDES-BENZ SL (R129) SL 73 AMG (129.076), MERCEDES-BENZ SL (R129) 600 SL (129.076) … View more

The steps may slightly vary depending on the car design.

This video shows the replacement procedure of a similar car part on another vehicle

All the parts you need to replace – Control Arm for SL (R129) and other MERCEDES-BENZ models

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Replacement: rear suspension lower control arm – MERCEDES-BENZ SL (R129). Tools you need:

                      Wire brush
                    
                      WD-40 spray
                    
                      Brake cleaner
                    
                      Copper grease
                    
                      Torque wrench
                    
                      Combination spanner #16
                    
                      HEX bit No.H5.
                    
                      XZN socket bit # 12 
                    
                      Drive socket # 10 
                    
                      Drive socket # 19
                    
                      Wheel impact socket #17
                    
                      Ratchet wrench
                    
                      Hammer
                    
                      Crow bar
                    
                      Tap wrench
                    
                      Ball joint puller
                    
                      Hydraulic transmission jack
                    
                      Wheel chock

Buy tools

Replacement: rear suspension lower control arm – MERCEDES-BENZ SL (R129). 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: rear suspension lower control arm – MERCEDES-BENZ SL (R129). Use the following procedure:

Step 1

Secure the wheels with chocks.

Step 2

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

Raise the rear 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-BENZ SL (R129)
Step 5

Remove the wheel.
Step 6

Unscrew the fasteners of the plastic car body protective cover. Use a drive socket #10. Use a ratchet wrench.

Step 7

Remove the plastic car body protective cover.
Step 8

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

Make a mark on the camber adjustment bolt.
Step 10

Unscrew the fastener connecting the control arm to the subframe. Use XZN #12. Use a drive socket #19. Use a tap wrench.
Step 11

Remove the fastening bolt. Use a crowbar. Use a hammer.
Step 12

Unscrew the fastener connecting the control arm to the rear knuckle. Use a combination spanner #16. Use HEX No.H5. Use a ratchet wrench.
Step 13

Detach the ball joint from the rear knuckle. Use a ball joint puller.
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.

AUTODOC recommends:
Replacement: rear suspension lower control arm – MERCEDES-BENZ SL (R129). Use only new bolts and nuts for installation.Do not damage the ball joint cover.
Step 17

Install the fastening bolt.
Step 18

Attach the ball joint to the rear knuckle.

Step 19

Screw in the fasteners connecting the control arm to the rear knuckle. Use a combination spanner #16. Use HEX No.H5. Use a ratchet wrench.
Step 20

Adjust the position of the alignment bolt according to the mark.
Step 21

Screw the fastener connecting the control arm to the subframe. Use XZN #12. Use a drive socket #19. Use a tap wrench.
Step 22

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

Tighten the fastener connecting the control arm to the subframe. Use XZN #12. Use a drive socket #19. Use a torque wrench. Tighten it to 70 Nm torque.
Step 24

Tighten the fastener connecting the control arm to the rear knuckle. Use a combination spanner #16. Use a torque wrench. Tighten it to 70 Nm torque.
Step 25

Remove the support from under the arm.

AUTODOC recommends:
Replacement: rear suspension lower control arm – MERCEDES-BENZ SL (R129). Lower the transmission jack smoothly, without jerks, to avoid damaging components and mechanisms.
Step 26

Reinstall the plastic car body protective cover.
Step 27

Screw in the fasteners of the plastic car body protective cover. Use a drive socket #10. Use a ratchet wrench.

Step 28

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

Treat the surface where the brake disc contacts the wheel rim. Use copper grease.
Step 30

Clean the brake disk surface. Use a brake cleaner.

AUTODOC recommends:
Replacement: rear suspension lower control arm – MERCEDES-BENZ SL (R129). After applying the spray, wait a few minutes.
Step 31

Install the wheel.

AUTODOC recommends:
Warning! To avoid injury, hold the wheel while unscrewing the fastening bolts. MERCEDES-BENZ SL (R129)
Step 32

Screw in the wheel bolts. Use wheel impact socket #17.
Step 33

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 34

Remove the jacks and chocks.