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Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 11-22-2016, 07:43 AM   #1
zheka130
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Knocking when driving over bumps, uneven surfaces - help diagnose

Guys

Need some help, since I know very little about suspension components.

When I am going over a bump, particularly when the car is on the "trailing" side of the bump and contacting even road surface, I hear a knocking sound in the front.

Also, occasionally it happens when I drive over rough surfaces.


One more question,

sometimes when I turn the steering wheel all the way to the right when reversing it gets stuck briefly at that point and takes considerable effort to get it to return to its original position.
Also, in the process of turning the steering wheel, I hear a "thump" in the front, as if I went over something, while the surface is smooth.


Help appreciated!
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Old 11-22-2016, 07:45 AM   #2
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Most likely one of your control arm balljoints.

Have you jacked up the car and try to move the wheel hub around by hand? That's usually diagnostic.
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Old 11-22-2016, 07:49 AM   #3
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The wheel feels loose if the ball joint is a problem, correct?
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Old 11-22-2016, 08:25 AM   #4
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Ball joint or control arm bushing, yes.
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Old 11-22-2016, 08:25 AM   #5
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It can be the Sway bar links
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Old 11-22-2016, 08:39 AM   #6
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Wheels felt solid last time I checked, a few months ago

Could it be the rubber bushings?
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Old 11-22-2016, 09:12 AM   #7
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It can be the Sway bar links
This
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Old 11-22-2016, 10:50 AM   #8
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Great, thanks guys

How big of a repair is this?

Any links that explain BMW suspension components and what each one does etc?

How similar are BMW suspension components to other auto manufacturers suspensions ?
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Old 11-22-2016, 10:55 AM   #9
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Great, thanks guys

How big of a repair is this?

Any links that explain BMW suspension components and what each one does etc?

How similar are BMW suspension components to other auto manufacturers suspensions ?
I used the Meyle front swaybar end-links as they're beefier than the stock versions. They're pretty cheap through ECS tuning.
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Old 11-22-2016, 10:56 AM   #10
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LCAB. These last as little as 40k miles depending on the road conditions the car is driven on.

My E46 had the LCAB replaced under the 48 Month/50k Mile Bumper to Bumper Warranty at around 40k miles!! I replaced them again at 84k miles!!

The LCAB just DO NOT last as long as you might think they should.
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Old 11-22-2016, 01:17 PM   #11
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Make sure to also grab your tie rods and move then. My buddies was making noise and that it was the culprit of his noises. Might as well test it and save money


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Old 11-22-2016, 01:21 PM   #12
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Make sure to also grab your tie rods and move then. My buddies was making noise and that it was the culprit of his noises. Might as well test it and save money


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Could you explain in a little more detail what you mean by this?
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Old 11-22-2016, 01:44 PM   #13
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Could you explain in a little more detail what you mean by this?
Get under the car and shake your tie rod to make sure it's not that. Would suck to spend money elsewhere only for it to not fix your problem. Ask the guy who replaced control arms and bushings and still has a steering wobble
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Old 11-22-2016, 01:45 PM   #14
zheka130
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Get under the car and shake your tie rod to make sure it's not that. Would suck to spend money elsewhere only for it to not fix your problem. Ask the guy who replaced control arms and bushings and still has a steering wobble
Thanks bud
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