forum.audiv8.com Foren English Audi V8 Forum Locking rear wheels

Hello,

I have a 1990 3.6L V8 that I am currently repairing. It has not been driven on the road for about 4 years now and I'm noticing every time I drive it out of my shop and make a tight turn the rear wheels seem to be locking up. The wheels will spin and jerk, has anyone ever noticed anything like this? The rear differnetial has a little leak from the seal, could this low fluid cause the problem maybe?

Thanks,

Kristian

90 V8 (75,000 km)
89 200Q (183,000km)
90 100 (182,000km)

Hi,
That is probably because you have too little oil in it or the oil is wrong. V8 lock is not a torsen and to my understanding it needs different oil.

Perttu

Hello Kristian,
try to clean the sensors of the abs-system. the locks of the quattrosystem get input from these sensors.
good luck!

Kristian, mine does exactly the same thing! Did you manage to find out what was causing it?

Is the diff the same as a 200tq?

Richard, I finally fixed the problem, although it could have been one of the two things I did that stopped my wheels from locking on tight turns. First my differential fluid was about 300 ml low from the leaking seal. I then proceeded to drain the differential fluid and fill it up with new fluid, the factory synthetic stuff. Secondly I removed and cleaned out both ABS sensors on the rear wheels. Next I took the car for a test drive and the jerking was there for a bit intially, but then as I drove it around a little more it went away. I only wish I had done one repair then tested it instead of doing both repairs and then testing it, now I don't know which repair fixed the problem, hope this helps.

Thanks to everyone that responded to my original post!

Kristian.

Finally fixed the problem about 3 months ago. The left front ABS sensor was not porperly installed and was causing the binding of the rear diff. Check you ABS senosors!

The problem will be caused by the ABS system. Either a faulty sensor or some other problem. I had a ABS sensor damaged and replaced by a dodgy "Audi specialist" and had the same problem. The ABS system is also used as a reference for the electronic control on the centre differential as if any wheelspin is detected the centre diff will lock up 100%. I went through 2 sets of tyres before I got to the bottom of it and found a decent engineer who set up the ABS sensors properly for £30. Also I read the V8 manual and realised that to stop the diff locking you just have to apply the brake very slightly which switches the diff lock off completely. This function also stops above 20-30 mph.