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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > front struts



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      05-15-2012, 12:22 AM   #1
335twins
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front struts

How would I know when my front struts are going bad? Reason im asking is when im going over bumps/potholes i hear a hissing sound from the front suspension, is that normal? or they are going out?

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      05-15-2012, 09:31 PM   #2
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anyone? im asking cause my maintenance is about to expire and if they are bad i want BMW to replace them..
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      05-15-2012, 09:58 PM   #3
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The seals go bad and the housing gets covered with dirt/dust due to it sticking to the oil leaking out. Not sure about the hissing sound.
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      05-15-2012, 10:48 PM   #4
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I could be wrong but I think the sound of hissing u here when u go over a bump is just front strut compressing. I have had my windows down and when I go over a speed bump they hiss. I know there not old my car has low miles so how many miles do you have on it. My guess is there perfectly fine I think that's a normal sound.
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      05-15-2012, 11:22 PM   #5
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thats what i thought about the struts compressing, i never really drive with windows down and when i heard it i was worried that they are going out. I got 40k miles on the car. When i looked at them, i didnt see any oil spilling out, so i guess they are ok.

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      05-16-2012, 12:23 AM   #6
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Quote:
Originally Posted by 335twins
thats what i thought about the struts compressing, i never really drive with windows down and when i heard it i was worried that they are going out. I got 40k miles on the car. When i looked at them, i didnt see any oil spilling out, so i guess they are ok.

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Yeah I'm pretty sure they are good. To be honest I think that hissing sound is kinda a good thing...to me it sounded like they were new and working perfect. But again I'm not an expert but mine does the same. It's perfectly normal.
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      05-16-2012, 02:22 AM   #7
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Quote:
Originally Posted by 335twins View Post
How would I know when my front struts are going bad? Reason im asking is when im going over bumps/potholes i hear a hissing sound from the front suspension, is that normal? or they are going out?

Thanks
Yes the hissing is normal. If you compressed a shock with your arms you were hear the hissing sound which is just the oil being pushed through the chambers. If you dont't notice a difference in ride quality then you should be good. Leaky shocks are a good sign of them going bad..

Eric

Last edited by beeming; 05-16-2012 at 08:20 PM.
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      05-16-2012, 07:00 AM   #8
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going over bumps and hearing your strut bottom out....real good sign you need to struts/shocks.
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