How to carry out replacement: Brake Pad Wear Sensor S 320 CDI 3.0 (221.022, 221.122) W221
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Change W221 S 420 CDI (221.028, 221.128) Brake Pad Wear Sensor yourself – manuals and video tutorials

How to change rear brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) – replacement guide

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Download your free tutorial and fix MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTEC 3.0 4-matic (221.083, 221.183) problems yourself Download for free 2.1 MB Brake Pad Wear Sensor for W221 Shop now
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When to replace the Brake Pad Wear Sensor on your MERCEDES-BENZ S-CLASS
Recommended replacement interval for the part category Brake pad wear sensor : 30000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ S-Class Saloon (W221) S 400 Hybrid (221.095, 221.195), MERCEDES-BENZ S-Class Saloon (W221) S 250 CDI (221.003, 221.103), MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTec (221.026, 221.126), MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTEC 4-matic (221.083, 221.183), MERCEDES-BENZ S-Class Saloon (W221) S 350 CGI (221.057, 221.157), MERCEDES-BENZ S-Class Saloon (W221) S 350 CGI 4-matic (221.082, 221.182), MERCEDES-BENZ S-Class Saloon (W221) S 500 CGI (221.073, 221.173), MERCEDES-BENZ S-Class Saloon (W221) S 500 CGI 4-matic (221.094, 221.194), MERCEDES-BENZ S-Class Saloon (W221) S 65 AMG (221.179), MERCEDES-BENZ S-Class Saloon (W221) S 350 CDI, MERCEDES-BENZ S-Class Saloon (W221) S 350 (221.056, 221.156), MERCEDES-BENZ S-Class Saloon (W221) S 500 (221.071, 221.171), MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI (221.022, 221.122), MERCEDES-BENZ S-Class Saloon (W221) S 450 (221.070, 221.170), MERCEDES-BENZ S-Class Saloon (W221) S 450 4-matic (221.084, 221.184), MERCEDES-BENZ S-Class Saloon (W221) S 600 (221.176), MERCEDES-BENZ S-Class Saloon (W221) S 65 AMG (221.179), MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 4-matic (221.080, 221.180), MERCEDES-BENZ S-Class Saloon (W221) S 420 CDI (221.028, 221.128), MERCEDES-BENZ S-Class Saloon (W221) S 500 4-matic (221.086, 221.186), MERCEDES-BENZ S-Class Saloon (W221) S 63 AMG (221.077, 221.177), MERCEDES-BENZ S-Class Saloon (W221) S 350 4-matic (221.087, 221.187), MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI, MERCEDES-BENZ S-Class Saloon (W221) S 350 CDI, MERCEDES-BENZ S-Class Saloon (W221) S 280 (221.054), MERCEDES-BENZ S-Class Saloon (W221) S 300 (221.054, 221.154), MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 4-matic (221.080, 221.180), MERCEDES-BENZ S-Class Saloon (W221) S 350 CDI 4-matic (221.080, 221.081), MERCEDES-BENZ S-Class Saloon (W221) S 450 CDI (221.028, 221.128), MERCEDES-BENZ S-Class Saloon (W221) S 350 CDI 4-matic (221.080, 221.180) … 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 – Brake Pad Wear Sensor for S-Class Saloon (W221) and other MERCEDES-BENZ models
How to change Brake pad wear sensor on W221 S 320 CDI 3.0 (221.022, 221.122) – step-by-step instructions for straightforward car repair Brake pad wear sensor
How to change Sensor, brake pad wear on W221 S 320 CDI 3.0 (221.022, 221.122) – step-by-step instructions for straightforward car repair Sensor, brake pad wear
How to change Brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) S 400 Hybrid (221.095, 221.195) – tips for proper car maintenance
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 400 Hybrid (221.095, 221.195) Petrol/Electro (279 hp)
Simple DIY car repair steps – Replacing Brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) S 250 CDI (221.003, 221.103)
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 250 CDI (221.003, 221.103) Diesel (204 hp)
Easy tricks to help you to replace Brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTec (221.026, 221.126)
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTec (221.026, 221.126) Diesel (258 hp)
Brake pad wear sensor removal & installation, incredibly easy steps for MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTEC 4-matic (221.083, 221.183)
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTEC 4-matic (221.083, 221.183) Diesel (258 hp)
Changing Brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) S 350 CGI (221.057, 221.157) – tips for first time repair
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 350 CGI (221.057, 221.157) Petrol (306 hp)
Main steps for Brake pad wear sensor replacement on MERCEDES-BENZ S-Class Saloon (W221) S 350 CGI 4-matic (221.082, 221.182)
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 350 CGI 4-matic (221.082, 221.182) Petrol (306 hp)
How to change Brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) S 500 CGI (221.073, 221.173) – tips for proper car maintenance
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 500 CGI (221.073, 221.173) Petrol (435 hp)
Simple DIY car repair steps – Replacing Brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) S 500 CGI 4-matic (221.094, 221.194)
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 500 CGI 4-matic (221.094, 221.194) Petrol (435 hp)
Easy tricks to help you to replace Brake pad wear sensor on MERCEDES-BENZ S-Class Saloon (W221) S 65 AMG (221.179)
Brake pad wear sensor for MERCEDES-BENZ S-Class Saloon (W221) S 65 AMG (221.179) Petrol (630 hp)
Tools
Replacement: brake pad wear sensor – MERCEDES-BENZ S-CLASS (W221). Tools you need:
Wire brush
Nylon cleaning brush
WD-40 spray
Electronic spray
Brake cleaner
Anti-squeal paste
Ceramic grease
Torque wrench
Torx bit E10
HEX bit no.H7
Wheel impact socket #17
Ratchet wrench
Long nose pliers
Brake caliper wind back tool
Crow bar
Wheel chock
Buy tools
Replacement: brake pad wear sensor – MERCEDES-BENZ S-CLASS (W221). AUTODOC recommends:
  • The replacement procedure is identical for both brake pad wear sensors on the same axle.
  • The wear sensors should be replaced together with the brake pads.
  • Please note: all work on the car – MERCEDES-BENZ S-CLASS (W221) – should be done with the engine switched off.
Carry out replacement in the following order:
  1. Step 1
    Open the bonnet. Unscrew the brake fluid reservoir cap.
    Step 2
    Secure the wheels with chocks.
    Step 3
    How to change Brake Pad Wear Sensor on W221 2005 - free PDF and video manuals
    Loosen the wheel mounting bolts. Use wheel impact socket #17.
  2. Step 4
    Raise the car.
    Replacement: brake pad wear sensor – MERCEDES-BENZ S-CLASS (W221). Tip from AUTODOC:
    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 5
    How to replace MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 3.0 (221.022, 221.122) 2006 Brake Pad Wear Sensor - step-by-step manuals and video guides
    Unscrew the wheel bolts.
    AUTODOC recommends:
    Warning! To avoid injury, hold the wheel while unscrewing the fastening bolts. MERCEDES-BENZ S-CLASS (W221)
  3. Step 6
    W221 S 500 5.5 (221.071, 221.171) 2007 Brake Pad Wear Sensor replacement: free workshop manuals
    Remove the wheel.
  4. Step 7
    Changing Brake Pad Wear Sensor on MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 3.0 4-matic (221.080, 221.180) 2008 by yourself
    Detach the connector of the brake pad wear sensor. Use long nose pliers.
  5. Step 8
    How to remove MERCEDES-BENZ S-CLASS S 350 BlueTec 3.0 (221.026, 221.126) 2009 Brake Pad Wear Sensor - online easy-to-follow instructions
    Clean the fasteners of the brake pad wear sensor wiring harness. Use a wire brush. Use WD-40 spray.
  6. Step 9
    How to replace Brake Pad Wear Sensor on MERCEDES-BENZ S-Class Saloon (W221) 2010: download PDF manuals and video instructions
    Unscrew the fasteners of the brake pad wear sensor wiring harness. Use Torx E10. Use a ratchet wrench.
  7. Step 10
    How hard is it to do yourself: Brake Pad Wear Sensor replacement on W221 S 350 CDI 3.0 2011 - download illustrated guide
    Remove the fastening bolt.
  8. Step 11
    Need to know how to renew Brake Pad Wear Sensor on MERCEDES-BENZ S-CLASS 2012? This free workshop manual will help you to do it yourself
    Detach the brake pad wear sensor wiring harness.
  9. Step 12
    Changing of Brake Pad Wear Sensor on W221 2013 won't be an issue if you follow this illustrated step-by-step guide
    Detach the brake caliper retaining spring. Use a crowbar.
  10. Step 13
    MERCEDES-BENZ S-CLASS S 420 CDI (221.028, 221.128) Brake Pad Wear Sensor replacement: online guides and video tutorials
    Remove the dust boot caps of the brake caliper guide pins. Use a crowbar.
  11. Step 14
    Replacing Brake Pad Wear Sensor on W221 2006 S 320 CDI 3.0 (221.022, 221.122) by yourself
    Unscrew the brake caliper fasteners. Use HEX No.H7. Use a ratchet wrench.
  12. Step 15
    S-Class Saloon (W221) S 350 BlueTec 3.0 (221.026, 221.126) 2007 Brake Pad Wear Sensor DIY replacement workshop manual
    Spread the brake pads. Use a crowbar.
  13. Step 16
    How to change Brake Pad Wear Sensor on MERCEDES-BENZ S-Class Saloon (W221) 2008 - tips and tricks
    Remove the brake caliper.
    Replacement: brake pad wear sensor – MERCEDES-BENZ S-CLASS (W221). Tip:
    Tie the caliper to the suspension or to the body with a wire without disconnecting from the brake hose to prevent depressurization of the brake system.Make sure that the brake caliper is not hanging on the brake hose.Don't press the brake pedal after the brake caliper has been removed. As a result, the piston can fall out from the brake cylinder, and brake fluid leakage and depressurization of the system may occur.
  14. Step 17
    Step-by-step recommendations for DIY replacement W221 2009 S 350 BlueTec 3.0 (221.026, 221.126) Brake Pad Wear Sensor
    Remove the brake pads.
  15. Step 18
    DIY replacement of Brake Pad Wear Sensor on MERCEDES-BENZ S-Class Saloon (W221) S 350 3.5 (221.056, 221.156) 2010 is not an issue anymore with our step-by-step tutorial
    Clean the brake caliper bracket from dirt and dust. Use a wire brush. Use a brake cleaner.
    AUTODOC recommends:
    After applying the spray, wait a few minutes.Check the brake caliper bracket, brake caliper guide pins and boots. Clean them. Replace, if necessary.
  16. Step 19
    How to change Brake Pad Wear Sensor on W221 2005 - free PDF and video manuals
    Treat the brake caliper piston. Use a nylon cleaning brush. Use a brake cleaner.
    AUTODOC recommends:
    Replacement: brake pad wear sensor – MERCEDES-BENZ S-CLASS (W221). After applying the spray, wait a few minutes.Check the brake caliper bracket, brake caliper guide pins and boots. Clean them. Replace, if necessary.
  17. Step 20
    How to replace MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 3.0 (221.022, 221.122) 2006 Brake Pad Wear Sensor - step-by-step manuals and video guides
    Press in the brake caliper piston. Use brake caliper wind back tool.
  18. Step 21
    W221 S 500 5.5 (221.071, 221.171) 2007 Brake Pad Wear Sensor replacement: free workshop manuals
    Attach the new wear sensor to the new pad.
  19. Step 22
    Changing Brake Pad Wear Sensor on MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 3.0 4-matic (221.080, 221.180) 2008 by yourself
    Treat the brake pads in the area where their surface comes into contact with the brake caliper bracket. Use anti-squeal paste.
    AUTODOC recommends:
    Make sure the disc surface is clean before installing the pads.
  20. Step 23
    How to remove MERCEDES-BENZ S-CLASS S 350 BlueTec 3.0 (221.026, 221.126) 2009 Brake Pad Wear Sensor - online easy-to-follow instructions
    Install the brake pads.
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