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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #1  
Old 12-08-2014, 10:47 PM
bmwx5er bmwx5er is offline
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Mein Auto: 2012 X5 50i, Infiniti G35
Thump/Thud while braking - failing driveshaft/transmission?

My recently-bought 2012 X5 50i makes a thud/thump when braking suddenly or reasonably hard. It is noticeable especially when the car comes to a complete stop, and then you accelerate a bit and press the brakes again immediately. Also noticeable when you brake suddenly (at any speed). I'd describe the sound as if a bowling ball in the trunk hit the rear seats.

The indy shop that did the PPI noted this in their inspection. When I took it to the dealer, they could not reproduce it (and neither could I). I have driven the vehicle enough to be able to repro it reliably now. I again took it to the dealership last week, and I demonstrated the thump to the foreman. He dismissed it saying that this was normal for E70s and E53s (something about too much torque on the driveshaft..), but still wanted to rule out suspension/bushings. As it seems to be common practice with many BMW dealers, their find was that everything was "normal" - no leaks/cracks in bushings and all alignment components were "tight". Apparently, they drove a couple of other "similar" vehicles, and found that they exhibited a thump too, when braking sometimes (see attached work order)


Does anyone else have a similar experience? is this normal? Or could this be a sign of impending failure of something major, like a driveshaft or transmission? this got me worried:
http://www.bimmerfest.com/forums/sho...d.php?t=733249

I'm taking the car back again in a couple of days. What should I ask them to inspect?
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Last edited by bmwx5er; 12-08-2014 at 10:52 PM.
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  #2  
Old 12-09-2014, 03:23 AM
TinyRK's Avatar
TinyRK TinyRK is online now
Ja mei!
Location: Aurora mit dem Sonnenstern
 
Join Date: May 2013
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Mein Auto: X5
My wife's e90 made a similar noise:
I've been told to check these things:
- tie rod
- wishbone
- bushings

And what it actually was: engine mount bolts were busted.
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  #3  
Old 12-09-2014, 07:54 AM
bmwx5er bmwx5er is offline
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Location: Seattle
 
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Mein Auto: 2012 X5 50i, Infiniti G35
Quote:
Originally Posted by TinyRK View Post
My wife's e90 made a similar noise:
I've been told to check these things:
- tie rod
- wishbone
- bushings

And what it actually was: engine mount bolts were busted.
Could you elaborate on your experience, and conditions under which the noise was produced, please? There is no noise in my car under regular braking (like coming to a stop in the lights, for instance) and I'm quite certain that I hear it coming from the rear - bad engine bolts would mean noise coming from the front?
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  #4  
Old 12-09-2014, 11:28 AM
ard ard is online now
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Mein Auto: '12 X5 35d/E39M5/996TTX50
torque converter lock up issue? Google this, see if other's reports of this symptom match your experience.

It is REALLY, REALLY hard to diagnose bushing issues by looking at them... actually impossible.
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  #5  
Old 12-09-2014, 11:42 AM
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TinyRK TinyRK is online now
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Location: Aurora mit dem Sonnenstern
 
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Quote:
Originally Posted by ard View Post

It is REALLY, REALLY hard to diagnose bushing issues by looking at them... actually impossible.

... Unless they're leaking.
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  #6  
Old 12-09-2014, 12:19 PM
bmwx5er bmwx5er is offline
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Location: Seattle
 
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Mein Auto: 2012 X5 50i, Infiniti G35
Quote:
Originally Posted by ard View Post
torque converter lock up issue? Google this, see if other's reports of this symptom match your experience.

It is REALLY, REALLY hard to diagnose bushing issues by looking at them... actually impossible.
thanks ard. I did a search both at the forums and the internet for torque converter issues. The symptoms don't seem to match (however, they may be related to another issue that i'm observing - will start a separate thread on that).

Just before I purchased, the car appears to have had "rear brakes & pads maintenance" done - could any failing/improperly installed braking component cause the symptoms i'm seeing? Just to emphasize, I don't hear any noise when I brake normally (i.e. when I'm coasting to a stop). Its only when I brake suddenly/hard, I hear a loud "thud".

what should I be asking them to look at - if I go back with no additional info, i'm likely to receive the same "its normal" crap. This morning, I paid more attention to the noise, and it seemed like it was coming from somewhere under/right behind the driver's side seat (can't pin point).
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  #7  
Old 12-09-2014, 12:39 PM
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Does the driver seat have play and moves?
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  #8  
Old 12-09-2014, 12:43 PM
bmwx5er bmwx5er is offline
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Quote:
Originally Posted by TinyRK View Post
Does the driver seat have play and moves?
not that I've noticed. why do you ask? i'll pay more attention..

I've been driving the car turning off the stereo, and boy, I could hear a few little annoying creaks. but once you hit the highway, you forget the problems
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  #9  
Old 12-09-2014, 01:47 PM
PAX5 PAX5 is offline
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Location: Pennsylvania
 
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Mein Auto: X5 50i
Here's a schematic of the BMW XDrive system (e53). You can see all of the possible moving parts.

Consistent with other reports, possibilities I'm thinking:
- drive shaft universal joint
- transfer case
- so called "guibo" (rubber donut)

or ...

brake caliper or caliper bracket bolts that were not torqued properly when discs were replaced ...
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