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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > PCV System, Noise under hard braking



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      02-03-2019, 11:55 AM   #1
Chris1337
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PCV System, Noise under hard braking

I am fbo e50 n55 e92 and when I brake hard I hear some squeaking noise for a second or two then it goes away. I am going to replace the top piece of the pcv system that is known for failing. assuming this fixes the issue, is there any way to check if the rear/front main seals are still good? I don't hear the noise anywhere near as much as other people.

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      02-03-2019, 03:18 PM   #2
bluewater328
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Where do you hear the sound originating from? What other things happen: shuddering/vibrations; feedback on the brake/steering wheel; is it more of a whistle or a creak?
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      02-03-2019, 03:19 PM   #3
Chris1337
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Quote:
Originally Posted by bluewater328 View Post
Where do you hear the sound originating from? What other things happen: shuddering/vibrations; feedback on the brake/steering wheel; is it more of a whistle?
It sounds like a whistle going in and out almost like a dolphin. No feed back literally just the noise.
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