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Old 05-01-2009, 01:25 AM   #1
sagelwwa
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Member#: 53975
Join Date: Jan 2004
Chapter/Region: South East
Location: South Carolina
Vehicle:
2004 Forester XT
Java Black Pearl

Lightbulb How-to: Cleaning ABS Speed Sensors

It has become apparent that one of the main causes for DCCD issues with the STi is brake dust coated ABS speed sensors. Whether you have an STi with DCCD or not, cleaning your sensors is a good practice. Unfortunately, with all of those out there who tell others to 'clean your speed sensors' no one seems to have a how-to or post about it. There are many others who believe they need their sensors cleaned, but have not even tried because they have no idea what is involved. The good news is that it is a simple practice and can be done very quickly!

BEFORE: (see below for link to pics)


AFTER: (see below for link to pics)


Cleaning Rear ABS Speed Sensors (2004 STi):
Need: 12mm socket, extension, ratcheting wrench, towel/cloth, cleaner such as Simple Green (many will work)
  1. Jack using the rear differential. Always properly support the vehicle with jack stands and wheel-chocks as well.
  2. Locate rear ABS speed sensor on the dust shield on the back of your rotor. The sensor is on the side closest to the front of the car. It is being held in by one bolt and has black wiring leading to it.
  3. Remove the bolt with the 12mm socket/wrench
  4. Pull the sensor out and proceed to clean the brake dust buildup off. I used Simple Green Motorsports Version sprayed onto a microfiber towel.
  5. Replace the sensor and tighten the bolt.
  6. Repeat for the other rear speed sensor.
  7. Carefully/properly lower the vehicle.

Front sensor how-to will be added soon.
I do not have photos of the front, if someone else has photos of the front, please post them!


UPDATE 04/18/2013
Photos Related to Post:
https://plus.google.com/photos/10995...53048115763905
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Last edited by sagelwwa; 04-18-2013 at 02:21 PM. Reason: Added link to photos
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Old 05-01-2009, 01:25 AM   #2
sagelwwa
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2004 Forester XT
Java Black Pearl

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Last edited by sagelwwa; 04-18-2013 at 02:22 PM.
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Old 05-01-2009, 01:31 AM   #3
hybrid gti 2
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I want to see pics
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Old 05-02-2009, 09:38 PM   #4
sagelwwa
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Rear pics added. Anyone have Front pics?
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Old 05-04-2009, 03:55 AM   #5
sagelwwa
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Still hoping someone has front pics, I won't be back under my car to get any for a bit. Post em up if you have em!
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Old 05-07-2009, 01:33 PM   #6
sagelwwa
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Added diagram, still hoping someone has front pics.
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Old 01-08-2010, 05:30 PM   #7
burken
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I just did this and now my speedometer is not working... help!!??
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Old 01-09-2010, 06:58 PM   #8
burken
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anyone?
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Old 02-27-2010, 11:30 PM   #9
TJOD
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Quote:
Originally Posted by burken View Post
I just did this and now my speedometer is not working... help!!??

I was about to clean my sensors until i saw this
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Old 02-27-2010, 11:34 PM   #10
TJOD
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Quote:
Originally Posted by burken View Post
I just did this and now my speedometer is not working... help!!??

I just read cleaning the sensor with compressed air can cause problems. Did you clean it with compressed air?
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Old 02-28-2010, 02:38 AM   #11
Web Foot STi
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If you are not having any problems I would not even think of cleaning any parts. If you are, CRC Brake Cleaner. You want to get rid of the grease and any metallic partials. The ABS system wants a nice clean square wave from each tooth. Any Klingon's to the tone ring can screw things up. 20 years ago I spent a good bit of time with this issue. We were defining manufacturing limits on how clean the edge could be, and how flat a pressed on ring had to be.
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Old 06-29-2010, 10:50 PM   #12
biv343
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Quote:
Originally Posted by Web Foot STi View Post
If you are not having any problems I would not even think of cleaning any parts. If you are, CRC Brake Cleaner. You want to get rid of the grease and any metallic partials. The ABS system wants a nice clean square wave from each tooth. Any Klingon's to the tone ring can screw things up. 20 years ago I spent a good bit of time with this issue. We were defining manufacturing limits on how clean the edge could be, and how flat a pressed on ring had to be.
Good info, +1

I use Valvoline break cleaner, works like a charm.
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Old 04-18-2013, 02:00 PM   #13
b00stedAJ
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Sorry to bump this up from so long ago but does anyone happen to have the pictures that are missing? or similar ones? Thanks!
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Old 04-18-2013, 02:22 PM   #14
sagelwwa
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Updated with a link to Google hosted pics. Add me to Google+ while you are there!
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Old 11-08-2015, 05:13 PM   #15
Dr. octagon
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I cleaned all 4 abs sensors and what used to be Claaaaaack, Bind, bind ,claaaack from the center diff with a volume of 10 has now been reduced 95%.

My rear abs sensors were horribly dirty, the front not so much.

02 wrx

05 sti trans
05 wrx front struts
R180
Dss rear axles to accommodate r180 and stay 5x100.

Was experiencing horrible binding g during slow speed turns like when turning into parking space.

No cels, spedo works, no abs lights either.

I used crc brake clean as paper towels.
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Old 01-04-2016, 08:17 PM   #16
Qbo707
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are these sensors the same sensors for a P2158 code (vehicle speed sensor "B") on a 2015 STI? I've been searching and can't find anything on this.
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