[Salem]

Over the past month I've been hearing a grinding sound coming from the front end of my 2015 335i. It sounds like metal scraping and the soft vibration is felt on the steering wheel. After a few minutes of driving it gets a bit harder to replicate but on some slow accelerations you can hear it. Sometimes louder then other times. Engine sounds fine and at higher speeds I don't hear or feel anything. It's just on slow accelerations. Not even when I'm breaking.

I attached a link to a reddit post with a video of the sound. Any help would be greatly appreciated.

https://www.reddit.com/r/BMW/comment...tm_name=iossmf

[exE36M3]

How many miles on your car? Some ideas:
1. Worn brake pads - although you should see a sensor or dash light about this. (The OLD days, when the pads were worn, you can hear them scrape as the brake is applied).
2. You might have a rock/stone stuck in between the pad sections - crazy uncommon, but maybe.
3. The brake shield may gotten bent toward the disc rotor - hit anything lately?

[BMWILUVU]

Originally Posted by Salem

Over the past month I've been hearing a grinding sound coming from the front end of my 2015 335i. It sounds like metal scraping and the soft vibration is felt on the steering wheel. After a few minutes of driving it gets a bit harder to replicate but on some slow accelerations you can hear it. Sometimes louder then other times. Engine sounds fine and at higher speeds I don't hear or feel anything. It's just on slow accelerations. Not even when I'm breaking.

I attached a link to a reddit post with a video of the sound. Any help would be greatly appreciated.

https://www.reddit.com/r/BMW/comment...tm_name=iossmf

Do you have grooves on your rotors? Try and see if the sound happens if you are turning left vs right. Have someone stand outside and see if they can find where the sound is coming from.

[Salem]

Originally Posted by exE36M3

How many miles on your car? Some ideas:
1. Worn brake pads - although you should see a sensor or dash light about this. (The OLD days, when the pads were worn, you can hear them scrape as the brake is applied).
2. You might have a rock/stone stuck in between the pad sections - crazy uncommon, but maybe.
3. The brake shield may gotten bent toward the disc rotor - hit anything lately?

75k miles and I only hear / feel it on slow accelerations. Never when braking.

[Salem]

Originally Posted by BMWILUVU

Do you have grooves on your rotors? Try and see if the sound happens if you are turning left vs right. Have someone stand outside and see if they can find where the sound is coming from.

I don't really hear it when turning. It's most notable on slow straight line accelerations.

[BMWILUVU]

Originally Posted by Salem

I don't really hear it when turning. It's most notable on slow straight line accelerations.

Are your rotors smooth? Jack up one front corner and rotate your tire by hand and see if you produce any sound or uneveness.

[alkhemist88]

Originally Posted by BMWILUVU

Do you have grooves on your rotors? Try and see if the sound happens if you are turning left vs right. Have someone stand outside and see if they can find where the sound is coming from.

Searching through old posts to see if I can diagnose a similar problem and found your comment. I hear a rubbing sound when I turn to the right while going slow, but nothing when turning left or straight. My front rotors are definitely worn. Curious why you were asking this question the original poster? Do the pads contact the rotors more when turning and cause noise if rotors are worn? My noise sounds like it is from the left front when this happens but I'm not 100% sure. Thanks in advance!

[BMWILUVU]

Originally Posted by alkhemist88

Searching through old posts to see if I can diagnose a similar problem and found your comment. I hear a rubbing sound when I turn to the right while going slow, but nothing when turning left or straight. My front rotors are definitely worn. Curious why you were asking this question the original poster? Do the pads contact the rotors more when turning and cause noise if rotors are worn? My noise sounds like it is from the left front when this happens but I'm not 100% sure. Thanks in advance!

Could be that your wheel bearings are starting to go.

[alkhemist88]

Originally Posted by BMWILUVU

Could be that your wheel bearings are starting to go.

I was worried that was going to be your response. Brakes need to be serviced anyway so I'll get an answer either way soon. Thanks!