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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 07-24-2015, 06:17 PM
docdoc88 docdoc88 is offline
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Mein Auto: 2004 325i
dsc / red brake light / abs light - on

I was backing out the driveway and heard a clunk noise like I had run over something ... and immediately the dsc / red brake and abs brake light came on ....I have read several post about these lights coming on ...but where do I look first taking into the fact of the clunk noise .... 2004 325i / with 141000 miles .... thanks
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Old 07-24-2015, 09:06 PM
u.nanimous u.nanimous is offline
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Mein Auto: 1999 740i
Did it also FEEL like you ran over something?
Did it come from a specific wheel?

I'd start by just checking at each wheel to make sure nothing (wheel speed sensor) is physically damaged. This might best be verified by removing the wheels unless you have a hoist.
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Old 07-25-2015, 04:32 AM
docdoc88 docdoc88 is offline
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Yes, it did feel like something had been run over but the "sound" was more than the "feel" ...if that makes any sense ...it seemed to come from the front. I even got out to make sure I had not run anything over. I get the car back from the paint shop on tuesday and will pull all the wheels off. I have read that you can get a yellow brake light showing on the dash and a red brake light showing on the dash ...what do the two different colors indicate ?? Is it ok to drive until I figure this out ?? Thanks
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Old 07-25-2015, 06:01 AM
FredoinSF FredoinSF is online now
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Quote:
Originally Posted by docdoc88 View Post
Is it ok to drive until I figure this out ?? Thanks

. NO!!
You heard and felt a clunk that resulted in immediate brake warning, the red one. You figure it out first BEFORE you drive the car on public roads, not the other way around.
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Old 07-25-2015, 08:29 AM
u.nanimous u.nanimous is offline
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+1 ^^^

Yellow is normally OK to drive but ANY RED LIGHTS mean DON'T DRIVE!
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Old 07-25-2015, 03:11 PM
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ahull ahull is offline
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Quote:
Originally Posted by docdoc88 View Post
I was backing out the driveway and heard a clunk noise like I had run over something ... and immediately the dsc / red brake and abs brake light came on ....I have read several post about these lights coming on ...but where do I look first taking into the fact of the clunk noise .... 2004 325i / with 141000 miles .... thanks
Yeah, this doesn't sound good. The ABS system also has "tone/pulse rings" that are connected to the inside of the wheel hub. It's rare but those can break off and/or I suppose the wheel speed sensors can become damaged.

Get under there and look at the thing. Remove the wheel speed sensor (allen head bolt). you should be able to see the tone/pulse ring teeth through the hole. Check the brakes for loose bolts on the caliper, etc.

Were you turning the steering wheel at all when the clunk occurred? The steering angle sensor is also connected to the DSC system.
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