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      12-03-2017, 07:58 PM   #1
dkchen85
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Braking Noise while in Sports Mode - M40i

New X3 M40i owner here. I had the car for a week now and finally got a chance to put the car into Sports Mode today. Notice that while breaking in sports mode there is a thump or knocking noise when braking. In comfort or adaptive mode I don't get this when braking. I contacted my sales guy and he said this is normal for the M engines. Has anyone else experience this as i don't think this is normal.
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      12-03-2017, 08:19 PM   #2
sor
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Are you sure it’s not the exhaust sputter? Should sound like something banging the rear trunk lid.

Is it during braking or when you let off throttle and/or shift?
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      12-03-2017, 08:19 PM   #3
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Quote:
Originally Posted by dkchen85 View Post
New X3 M40i owner here. I had the car for a week now and finally got a chance to put the car into Sports Mode today. Notice that while breaking in sports mode there is a thump or knocking noise when braking. In comfort or adaptive mode I don't get this when braking. I contacted my sales guy and he said this is normal for the M engines. Has anyone else experience this as i don't think this is normal.
Hmm. It's not the exhaust popping is it?
I'm yet to drive an M40i ((
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      12-03-2017, 08:23 PM   #4
dkchen85
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Quote:
Originally Posted by sor View Post
Are you sure it’s not the exhaust sputter? Should sound like something banging the rear trunk lid.

Is it during braking or when you let off throttle and/or shift?
I only hear it during braking and in sports mode. I'll take a video and post it tomorrow when I get home. I scheduled a service appointment just to be safe. It does sound like a knocking noise.
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      12-03-2017, 08:24 PM   #5
edcrane
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Think that’s the exhaust. Makes a “blatt” sound when it down shifts in sports mode. When I took it ona test drive, I thought there was something wrong with the brakes or rear end, but realized jt was the exhaust after a while. Try rolling down the window.
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      12-03-2017, 08:52 PM   #6
sor
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Quote:
Originally Posted by dkchen85 View Post
I only hear it during braking and in sports mode. I'll take a video and post it tomorrow when I get home. I scheduled a service appointment just to be safe. It does sound like a knocking noise.
Maybe roll down the windows to see if you can hear it as the exhaust. Or just sit in the car in park and rev it in sport when it is warm and see if you hear it. No brakes involved.
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      12-04-2017, 01:41 AM   #7
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When shifting or decelerating in Sport Plus it doesn't crackle, it booms like a 50 Cal machine gun.
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      12-04-2017, 11:46 AM   #8
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Quote:
Originally Posted by dkchen85 View Post
New X3 M40i owner here. I had the car for a week now and finally got a chance to put the car into Sports Mode today. Notice that while breaking in sports mode there is a thump or knocking noise when braking. In comfort or adaptive mode I don't get this when braking. I contacted my sales guy and he said this is normal for the M engines. Has anyone else experience this as i don't think this is normal.
Chances are it's the exhaust "grumbling". I think it is loudest when in Sport+ or Sport Individual with the engine set to Sport+ mode.

BTW, tell your sales guy that the X3 M40i does NOT have an M engine.
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