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-   -   ABS light... Location of Control Unit? (http://www.318ti.org/forum/showthread.php?t=27944)

xunearthhxcx 08-31-2009 12:11 AM

ABS light... Location of Control Unit?
 
I recently went through and put new OEM quality pads and rotors on all 4 wheels because I had both the ABS and the Pad wear lights... I still have the pad wear light, and also the ABS light.. While changing the brakes, I cleaned all the sensors with electric parts cleaner . This didnt make a difference...

What im wondering now is regarding the abs.. Where is the control unit located? Is it wise to unplug it, clean it, and plug it back in in hopes that it works and clears the light? Or should I get new sensors and just hope that does the trick?

I know the control unit is expensive, but ive found a few for less than 100.00 used.. would it be wise to get new sensors anyways, and if that doesnt work then to look to change the control unit?

also with the pad wear light still on, I did not bleed the brakes. Could this possibly solve the pad wear light issue?

thank you for any information !

Im learning more about these cars everyday, slowly starting to get my Clubsport back to perfect stock form.

Anthony

CirrusSR22 08-31-2009 12:17 AM

Did you test all the wheel speed sensors with an ohm meter yet?

tiFreak 08-31-2009 12:22 AM

you might need to replace the pad wear sensors, bavauto sells them I believe

xunearthhxcx 08-31-2009 12:49 AM

Quote:

Originally Posted by CirrusSR22 (Post 242817)
Did you test all the wheel speed sensors with an ohm meter yet?

nope, was hoping a good ole cleaning would do the trick. I actually dont own a meter, but I intend to buy one. After "vacation" this weekend ill pick one up.

xunearthhxcx 08-31-2009 12:50 AM

Quote:

Originally Posted by tiFreak (Post 242818)
you might need to replace the pad wear sensors, bavauto sells them I believe

sucks, I was thinking that too. Oh well, whats another 80-100 bucks..:mad:

tiFreak 08-31-2009 12:58 AM

actually, they're only $10 each, and you only need 2, left-front and right-rear

xunearthhxcx 08-31-2009 01:01 AM

Quote:

Originally Posted by tiFreak (Post 242823)
actually, they're only $10 each, and you only need 2, left-front and right-rear

I was under the impression there were 4 pad wear sensors, and only 2 ABS sensors?

ABS driverside front, and passenger rear..

dont all 4 wheels have pad wear sensors? If not, what is that little black sensor wire going from my brakes to the inside wheelwell that I can unplug and plug and connects to my brakepad?

maybe im just backasswards?

1996 328ti 08-31-2009 01:11 AM

Quote:

Originally Posted by xunearthhxcx (Post 242824)
maybe im just backasswards?

Ah you said it, not I.
Each wheel has an ABS sensor.
Only 2 brake pad sensors.

cooljess76 08-31-2009 02:11 AM

Quote:

Originally Posted by 1996 328ti (Post 242826)
Ah you said it, not I.
Each wheel has an ABS sensor.
Only 2 brake pad sensors.

+1

4 ABS sensors (each wheel)
2 Pad wear sensors (driver front, passenger rear)

Rear ABS sensors should come out with a gentle prying, fronts will more than likely break and/or become destroyed trying to remove them. Your best bet trying to remove the front ABS sensors is to remove the calipers and brake rotors, remove the hub nut dust cap, remove the hub nut, remove the wheel bearing/hub, remove brake dust shield, remove ABS sensor allen bolt, place a deep set socket over the end of the sensor and carefully tap it back through the kingpin/spindle. Chances are you'll still end up destroying them, so be prepared to purchase new ones.

pdxmotorhead 09-01-2009 06:38 AM

Make that 3 ABS sensors, 1 on rear diff, one on each front wheel. At least thats whats on my 95....

Pad wear sensor are a visual inspect you don't need a ohm meter, if the little metal loop is worn through its shot.

Dave

cooljess76 09-01-2009 06:52 AM

Quote:

Originally Posted by pdxmotorhead (Post 242967)
Make that 3 ABS sensors, 1 on rear diff, one on each front wheel. At least thats whats on my 95....

Pad wear sensor are a visual inspect you don't need a ohm meter, if the little metal loop is worn through its shot.

Dave


6/96 and up have 2 ABS sensors in the rear and 2 in the front.

rear ABS sensors(item#11)
http://www.realoem.com/bmw/showparts...99&hg=33&fg=30

front ABS sensors(item#7)
http://www.realoem.com/bmw/showparts...21&hg=31&fg=10

The sensor on your diff is the speed sensor(item#11)
http://www.realoem.com/bmw/showparts...31&hg=33&fg=10

vandergat 04-12-2012 02:33 AM

ABS 177
 
I also have the ABS light on
I ran a diagnostic and got 177 fault valve load circuit fuse
anybody have any idea how to solve this?:confused:


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