rear near side scrape scrape scrape!!

O

OdysseyHal9000

Member
 Warton, Lancashire
Hi everyone, I'm new to the forum and new to Z4's (but not BMW it's my 3rd one). Bought my dream car 3 weeks ago, 2008 3.0si Sport coupe from a BMW main dealer with 12 months extension on warranty. I have fallen victim to the dreaded rear wheel scrape scrape scrape syndrome, and the car is back at the dealers for the second time since I picked her up. There are no stones trapped, the rear plate/shield is not touching and they have assured me that they have checked all the braking system and handbrake and nothing is wrong there. I accepted this the 1st time, then when I got home and it was still doing it I booked it straight back and so they've had it since yesterday. I'm fully expecting the "sorry we can't find anything wrong" call anytime soon. I kust wondered if anyone has any other experience of this, or knows where I stand as I really don't want the car back till it's right, I hate driving it it's embarrassing! But I understand the nightmare of the "intermittent fault", I'm an engineer by trade.
Cheers,

AL.
 
does this happen with motion.. like the wheel is catching something? So jack it up and spin the wheel by hand to reproduce it.

Probably just the broken spring.... or maybe an exhaust bracket/ headshield?
 
Yes, with motion. Speeds up and slows down as the car does. Unaffected by applying brakes (foot or handbrake). BMW have checked pads, calipers, discs, hubs, shoes, heat/dust shield. As the noise is unaffected by applying the brakes (apart from it slows down as the car slows down) I was fairly confident that it was nothing to do withthe brakes. Was hoping it for the bent dust shield/ trapped stone scenario but it's definitely not either. Since the techs at BMW have now heard the noise, it would appear to be more of a "squish squish" noise. It does sound like a scraping sound from inside the car, but I'm hearing it from the wrong side of the car through an open window so it must distort the sound. I've never heard it from outside but 2 different people have now confirmed it to be a "squish squish" kind of sound. Sort of metal on rubber I suppose. But we've checked the obvious and there's no way the tyre is catching on anything whilst driving in a straight line, no scuff marks, nothing, nada. This fault just gets weirder!!!!!!!!! :headbang:
 
Just picked car up. Latest theory is that, since the car has just had 4 brand new star spoke wheels under warranty, the rear tyre was not set correctly on the rim and also slightly under inflated (but not enough to trigger the runflat warning) and consequently was moving slightly against the rim in one spot with each rotation of the wheel!

It did sound like a scrape from inside the car - honest!

But BMW have assured me that from outside the car it is more of a squish noise.

Hope that's the end of it anyway and I can get on with enjoying the car now.
 
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