[firefish]

After fitting the brake cooling hose adapters from Lindsey I have developed a sound from what seems to be the left front wheel. The noise is a best described as whining and it is accompanied by a sligth buzz in the steering wheel. Sharp right turn makes it worse, sharp left makes it go away. It is speed related and has nothing to do with engine rpm.
Since fitting the adapters involved removing the hubs I naturally assumed that I had f**ked up and hence I checked and reset the play in the wheel bearing on the left front wheel as per the manual, thinking that I had set it to tight. It didn't help. When turning the hub with rotor off there is nothing to indicate something is amiss.
Today I took both hubs off again, gave 'em a good cleaning, checked them thoroughly and applied new grease (the expensive kind). I also lifted the rear up to check if I have a problem in the rear that could cause this but everything is turning nice and smooth.
I have yet to test drive the car after my last fix but I somehow doubt that I have fixed the problem. Any ideas of what could be the cause of this?

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[flash]

sounds like maybe tire flex under load is causing something to rub

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[firefish]

<!--quoteo(post=80038:date=Sep 14 2009, 07:48 PM:name=flash)-->QUOTE (flash @ Sep 14 2009, 07:48 PM) <{POST_SNAPBACK}><!--quotec-->sounds like maybe tire flex under load is causing something to rub<!--QuoteEnd--><!--QuoteEEnd-->

No sign of any rub that I can find. It sounds as a bad bearing but I cannot see anything wrong with them, could they go bad and make noise but still look good and spin freely and feel ok? I'd rather not just throw parts at the car without knowing what the problem is.

When I took the hubs off the first time I dropped the outer bearing on the floor, can't remember which side. It was coated in greased and the floor was clean so I didn't think much of it but maybe one of the rollers is out of round from the impact?

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[flash]

they can make noise but still be good, especially if something got in there

not likely you dinged or harmed the bering by dripping it - they are very hard steel - but, you could have picked something up in the grease and not seen it

also, if they are too tight, they will howl - unfortunately, by the time you usually figure that out, the finish surface of the bearing is ruined

these things are a pain in the butt to adjust - dumb design - i would take it apart and check it out as soon as i could

but first, i would smear something on the inside shoulder of the tire and then drive it, make the noise, and make sure the stuff didn't rub off - i really tend t suspect that the hose setup is somehow making contact with the tire

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[firefish]

I doesn't take much turn to increase the noise, it's more about transferring the load. I had them apart and cleaned them spotless and used new grease - no change. I guess that it is bad and that I have to replace it.

The hose is OEM and it sits where it is supposed to and shows no sign of contact with tire.

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[flash]

i was referring to the lindsey brake cooling thingy - i presumed there was a hose that went to that which fed it cool air from the front of the car

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[DaveN]

Totally not Porsche related but when I did my pad on my Buick (gack!) I had the exact same noise. Tried all kinds of things to find the rubbing/howling noise as I couldn't figure out what I could possible screw up changing pads. Exact same symptoms, turn one way gets bad, turn another and it geos away - feel it in the stearing wheel as well. Turned out to be a hub bearing. Somehow I got/knocked something in there while just changing the pads. Of course you have to buy the whole hub as the bearings are not replacable - but that's another GM story!

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[firefish]

I haven't put the hose for the cooling in yet, only the bracket (I'm kinda slow).

Anyway, I fitted the S4 brakes the other day and after removing the old rotor and caliper I spun the hub - CRUNCH! - and the source of the previously whining but now grinding noise has been identified. I have ordered a new set of bearings and I'll remove the hub today and inspect the mess.

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[flash]

bummer - i hate it when stuff like that happens

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[firefish]

Bearings fitted and problem SOLVED!

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[flash]

glad that's fixed

want to come find my squeak?

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[firefish]

will work for food [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

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