Rear differential lock always on
rossato.qlist at gmail.com
Mon Apr 26 04:07:33 PDT 2010
Maybe it's a short wheelbase thing. All I can say is that I've never
experienced that on any of the C4 chassis quattros I've driven. With tires
ranging from snows to 255/40-17s. Radek's problem could still be a locked
From: Huw Powell [mailto:audi at humanspeakers.com]
Sent: Monday, April 26, 2010 2:17 AM
To: Robert Rossato
Cc: 'Cody Forbes'; 'Radek'; quattro at audifans.com
Subject: Re: Rear differential lock always on
ABS, haha, long dead. Relay pulled, switch gone. The rear is not
locked, everything is different when I do that.
Robert Rossato wrote:
> Hmmm, I wouldn't expect it to be a Torsen thing. My S6 is essentially the
> same setup as the 90Q - Torsen center diff and lockable rear diff. The
> time I have had shuddering from the rear wheels was when I locked the rear
> diff on dry pavement on purpose - just to make sure it was engaging.
> Otherwise she's quiet. Full lock or not.
> Sounds like the rear diff is stuck in the locked position. Is the "ABS
> light on by chance? That comes on when you engage the rear diff lock,
> should disengage on its own at 15 mph. If the light is on and it's not
> disengaging at 15 mph then it sounds like there might be something foofed
> with the vacuum switch. If the light is not on, then it's possible that
> rear diff lock is internally stuck. Try crawling under there and see if
> can engage/disengage manually.
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