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      10-25-2017, 01:11 PM   #1
Jai
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Soft whirring noise on braking, where to search

Hi guys,

So I have something weird and I don't know how to diagnose it as it's not present with the car standing still

When driving (without braking) there is no problem but when I am driving and I start braking a little I hear a whirring sound coming from the front. It's not the brakes I think and it doesn't sound like metal.

It started doing this only after long high speed trips but now also does it if I would drive 10 meters and brake.

Any idea where to start searching? Would debris in the blower motor be possible on a 2005 N52 330i e90?

Thanks!

Last edited by Jai; 10-25-2017 at 01:18 PM.
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      10-25-2017, 01:36 PM   #2
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My guess is a bearing on one of the wheels is starting to go bad, but I could be wrong. We can't help you without an audio or video clip. Or, take it to a BMW specialist and have them ride in your car.
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      10-25-2017, 01:43 PM   #3
Jai
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Before summer a mechanic from the BMW specialist I goto did check for bad bearings for 'another' problem which turned out to be the tyres... He drove I sat next to him and he said there was nothing wrong with the bearings. He did some hard driving steering left and right and braking. But who knows, I'll put it on my list!
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      10-25-2017, 01:57 PM   #4
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Quote:
Originally Posted by Jai View Post
Before summer a mechanic from the BMW specialist I goto did check for bad bearings for 'another' problem which turned out to be the tyres... He drove I sat next to him and he said there was nothing wrong with the bearings. He did some hard driving steering left and right and braking. But who knows, I'll put it on my list!
Did the mechanic check each wheel thoroughly by lifting the car and spinning the wheel to ensure it spins freely, not tight, and there is no strange grinding sound? Also, he should have checked for any play (which there should not) by giggling the tire left and right and up and down.
If he did this and found nothing unusual, then the bearings are good and would have to be one of the tires. Since you have an older model BMW, you should have a compact spare. Replace one tire with the spare and do the same braking and see if the noise occurs. Rotate the compact spare to the next tire and repeat the same. If the sound at braking no longer occurs at one of those swapped tires then you'll know whether its the tires or not.
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      10-25-2017, 02:27 PM   #5
Jai
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I do not have a spare, I have 4 RFT's and no room for a spare in the back!
Also, it has done the exact same noise on the previous tyres as well so I think we can really forget the tyres.

I've done exactly that test myself last time I did the oil. It spins freely and up down left right is also fine no play at all. Not sure if the mechanic did that afterwards of the driving together but I think so as they got payed to check the problem and see if anything else was up with the car.

I'm beginning to think more and more it's debris in the blower motor or maybe a pulley that has some play front and back when I brake or is that an insane thing to think about?
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      10-25-2017, 02:49 PM   #6
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This thread is almost painful to read.
Wheel bearing issues would be heard braking or not braking, and especially when putting increased weight (during turns for example) on the affected side. I'd say it's not a wheel bearing, especially after a mechanic already ruled it out.

You sure it's a "whirring sound"? Take a video or audio recording from inside the car and next to it when you begin braking so we can at least rule out your earlobe-to-brain interface possibly being miscalibrated for recognizing "whirring sounds".

Yes, I believe you're getting close to insanity when you start guessing a "blower motor" or "pulley" could be causing a whirring sound only when braking, especially just slight braking. But hey, maybe someone spliced a "blower motor" to your brake light wiring as a practical joke. Just how likely is that, Jai? Ask your friends if they did it. Record their reactions and show us for the LOLs.
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Last edited by MysticRob; 10-25-2017 at 02:58 PM.
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