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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 11-24-2012, 12:56 AM
fons fons is offline
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Mein Auto: x3
Help, my car bounces when i brake slowly

I just replaced the two front arms in both sides and the two front drive axels but my x3 2004 still bounces when i brake in low speed. does any know what's wrong with my car. i don't know what else needs to be replaced. basically, when i go from 15 miles and i brake slowly, it bounces right before the car stops. it seems that the passenger side is the one that bounces. I also replaced all pads and rotors four months ago.

Last edited by fons; 11-24-2012 at 01:01 AM.
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  #2  
Old 11-24-2012, 06:53 AM
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mlukas161 mlukas161 is offline
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There are a total of four arms up front. The thrust arms are the more likely to cause the "bounce" under braking. I would change those along with their ball joints if that hasn't been done yet.
No alignment is needed after changing the thrust arms.
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  #3  
Old 11-24-2012, 08:36 AM
fons fons is offline
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Yes I replaced The thrust arms and lower control arms plus the drive axels in both sides but still is I can feel the kick.
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  #4  
Old 11-24-2012, 09:51 PM
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mlukas161 mlukas161 is offline
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Could it be related to the transmission downshifting?
What about tire pressure? Have you checked those.
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  #5  
Old 11-25-2012, 01:14 PM
fons fons is offline
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thanks, I'll check the tires and transmission. I've been reading some bimmer forums and i haven't seen any similar situation. Its very weird. I hope its not the transmission.
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  #6  
Old 11-27-2012, 02:04 AM
ncativo ncativo is offline
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Mein Auto: X3 2007 3.0TD
I had a similar problem but it got fixed once the front control arm bushings got replaced
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  #7  
Old 11-27-2012, 03:52 AM
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mlukas161 mlukas161 is offline
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Was the suspension preloaded when you final torqued the thrust ARM bushings?
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Old 11-27-2012, 10:49 AM
usaret usaret is offline
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Worn out struts?
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  #9  
Old 11-27-2012, 02:25 PM
fons fons is offline
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Not sure but I don't think was preloaded. I took my bimmer to the mechanic and he said that may be the driveline axel. He will inspect it this week to make sure what the problem is. I'll keep you posted!!
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  #10  
Old 11-28-2012, 07:21 AM
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mlukas161 mlukas161 is offline
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If the suspension wasn't preloaded the new bushing may have failed already depending on how many miles you've driven.

The correct way to change the thrust arms is to leave them loose, lower the X3 onto the ground or ramps, add approx 200 pounds to the front seats, then final torque the thrust arms.
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  #11  
Old 11-28-2012, 11:59 PM
fons fons is offline
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That's very interesting!!! I did not know anything about preloading and then torque. I'll check the trust arm and the bushing again. Thanks!!
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