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#1
12th November 2014, 07:45 PM
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Grinding noise from rear
Hi,
Just noticed my 2001 2.8QS (103k) making an odd grating grinding noise when pulling away. Doesn't happen all the time but does seem to happen more often when going round a bend. Sounds like a piece of metal dragging against the road but checked and can't see anything obvious. Pretty sure it's coming from the rear. Could it be rear dif? Thanks 
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#2
12th November 2014, 08:09 PM
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Or a seized rear calliper? They are prone to that
__________________
2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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#3
12th November 2014, 08:44 PM
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I'd agree with that sounds like a seized rear caliper, which would also affect your handbrake operation too on at least the one side. I've just replaced the OSR one on my D2 with a new caliper
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Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#4
12th November 2014, 09:05 PM
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Oddly, so did I, well a bit earlier this year. New NSR caliper, not exactly cheap!
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#5
13th November 2014, 08:15 AM
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Sorry maybe I didnt describe the noise well enough. I have had a stuck caliper before and I take it the noise your talking about is the worn break pad (down to metal) grinding against disc? I have checked both calipers afer a journey and they are pretty cool to the touch.
The noise is more like a very loud mechanical clicking sound, similar to what I'd imagine two cogs slipping would sound like coming from the rear area. Any ideas? is the rear dif a weak link?
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#6
16th November 2014, 11:56 AM
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I have never heard of a read diff going, either on this forum, or the US forums (quattroworld, audiworld). So I guess they are quite strong.
You may want to check oil level in the rear diff, I believe it should be level with with bottom of the oil plug hole. Also, non worn brake pads will make a noise for the first few yards if the car is kept outside due to rusting on the disc, mine does every time it sits for a few days. Rear calipers are not seized. Also, sometimes a slightly dented or lose gearbox heat shield may catch a drive shaft or wheel at full lock only and produce a metal scraping sound, if you have access to a lift may be worthwhile looking under the car to see if any moving parts touch anything at full lock. Last edited by Goran; 16th November 2014 at 11:59 AM.
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#7
17th November 2014, 08:49 AM
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Similar to you I have never heard of dif's going but everything currently seems to point to it...
I read on a US forum that you can test if its the dif by ever so slightly applying the handbreak which disengages the dif (or haldex?not sure) as your moving and this, for me, kills 90% of the noise. Im pretty sure its not the breaks as I have just recently had new calipers, disks and pads. They breaks arent rubbing as they are cool to touch after most journeys & I have heard dodgy breaks many a time. Its more of a fast 'clack clack clack' noise, similar to a draw bridge being lowered for want a better description. Only happens when accelerating round a corner. I have it booked into autohaus in Edinbugrh on wednesday to get it checked over. Last edited by rory_pamphilon; 17th November 2014 at 11:57 AM.
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#8
17th November 2014, 10:14 AM
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CV joint?
__________________
Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#9
17th November 2014, 10:36 AM
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Quote:
I had the loose rear pads noise once. The pad clips hadn't been correctly refitted so the pads were clattering against the discs. Took a while to realise what it was. It sounded more like something loose underneath the car. If it's pad rattle though, you can usually diagnose it by lightly braking while driving to stop the rattling.
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#10
17th November 2014, 12:01 PM
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Its less of a tiny clatter and more of heavy machine gun, I was shocked how loud it was when I opened the windows, just shows how good the sound insulation is in an A8!
Will check if brakes kill the noise but i dont think they do, bar using the handbreak ever so slightly. That definately works. So is it true that with the handbreak applied, even slightly, a quatrro becomes a FWD?
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