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General E46 Forum
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Old 06-10-2009, 11:43 PM   #1
gupta_amit
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Front brake sensor light...

My front brake light indicator on the dashboard came on some time back. During a visit to the dealer they said that the front brake sensor cable was spliced (but they would not jut patch it up, had to be replaced). So, today I removed the front left wheel and noticed the spliced cable. There were 2 (copper?) strands inside the cable but they were not separated in anyway.

So, I simply removed the insulation on both ends and twisted them together tight and put some electric tape around it to seal it. However, upon restarting the car, the brake light indicator on the dash did not go away. My brakes are only 6 months old, so Im pretty sure its not the state of the brake pad/rotors.

Any ideas what maybe causing the brake light to come on and how to get rid of it?

I also noted that there is a junction box behind the wheel, inside which there are 2 sensors. However, when I removed the right side wheel, the junction box on that side only had one sensor inside itis that by design?
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Old 06-11-2009, 01:09 AM   #2
Chris-TK
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I'm not sure if your jerry-rig will work, but given the fact that the sensor is working properly you will need to reset it as with any brake sensor change. To do this put the key in the ignition and turn it to position 2 and let the car sit with all the dash lights illuminated. Given that the sensor is still working properly it SHOULD cause the light to go out after about 1 minute.
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Old 06-11-2009, 02:09 AM   #3
gupta_amit
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Ok, I'll give that a shot in the morning

Thanks
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Old 06-11-2009, 02:26 AM   #4
D4rkkn1ght
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Quote:
Originally Posted by gupta_amit View Post
I also noted that there is a junction box behind the wheel, inside which there are 2 sensors. However, when I removed the right side wheel, the junction box on that side only had one sensor inside itis that by design?
Just to answer this, the 2 sensors are the brake pad sensor and the ABS sensor. The brake pad sensors are only on the driverside front and the passenger side rear. ABS sensors on all 4 ends though.
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Old 06-11-2009, 07:18 AM   #5
skang330
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If that doesn't work, just get a new sensor. I think its like 15 bucks or so from the dealer.
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Old 06-11-2009, 08:31 AM   #6
gupta_amit
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Thanks all. I have another question.

When I removed the front right side wheel, I noticed that there was a wire/cable with a round plastic thing (2 inches in diameter) attached to it via a connector, that was simply dangling behind the wheel area. I traced the wire and it was originating from the front bumper side and went somewhere up there. It's kind hard to explain this, so I'm posting some pocs of how it looked (dangling) and then some close-ups with the plastic thing removed.

Any idea what this thing is and where it should really be?

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Old 06-11-2009, 09:14 AM   #7
rabbitw00t
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lol owned? did some rats get under your car and go to town?
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Old 06-11-2009, 10:51 AM   #8
nathancarter
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That's the external temperature sensor for the washer fluid heater (as opposed to the external temperature sensor for the OBC and HVAC, which is in the left front). It's supposed to be clipped into the lower/horizontal part of your wheel well liner, but it looks like your wheel well liner was torn out when the previous owner ran over that hobo - probably the same incident that damaged the brake pad wear sensor. No idea why the temperature sensor is dangling out the brake duct. The wiring shouldn't be visible at all; it's all supposed to be contained and protected in the space between the wheel well liner and the bumper.

A proper repair will probably entail a new wheel well liner. For now, I'd probably just tuck it inside the wheel well liner. Remove the wheel well liner, make sure the brake duct is lined up properly, and maybe tape the wire to the inside of the (damaged) wheel well liner. It's also probably a good idea to jerry-rig some plastic or duct tape or something to cover the big torn-out hole in your wheel well liner, to keep excess water and mud and grime from getting up inside the bumper where your fog lights live.
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