Bora 4 Motion needs a Haldex coupling.

[gator3535]

hmm could it be ??? I have the car back now and have taken it though some u-turns and reverse u-turns and .. NO MORE noise .. Could it be the VW expert was wrong ?? hmmm could it be the dealer who said they fixed actualy packed the diff with bannanas and it will explode the day the warranty runns out hmm

I am so confused ..

[WhO]

To the OP, Definitely try the controller first. Mine shat itself leaving me in FWD and everybody under the sun from VW to vwvortex told me that the haldex unit itself was at fault. I had this dreaded fault come up on vagcom:

1 Fault Found:
01155 - Clutch
04-10 - Mechanical Malfunction - Intermittent

From that everybody was convinced the whole rear haldex unit had bitten the dust. Cut a long story short i thought it wasnt the clutch packs as if i turned the car on from cold, and quickly gave it a bootfull on grass / dirt it sometimes had 4wd for a brief moment so they were still capable of transferring torque.

Anyway i ended up buying a complete rear diff/haldex assembly 2nd hand at a reasonable price (because the diff apparently has a shot bearing) from an Audi TT out of the UK just incase, swapped the haldex controller over first just to be sure and voila, 4wd working like a charm again Should've just bought a haldex blue controller dammit, with the prices i've seen them at it mightnt have been much more expensive!

[WhO]

is there specific oil cited for haldex and diff? or can the diff oil be snuck into the haldex coupling?

Diff oil will quickly kill the haldex coupling! There are cases of haldex units having died from apparent fluid migration from the diff into the haldex unit. So whatever you do make sure you use the right oil, its not cheap but considering it dosn't really get changed that often its a bargin compared to a broken haldex!

[Bora Sport]

As I mentioned in my much earlier post I had severe noises coming from the rear in my Bora. It was fine starting off cold but after say a one hour drive any forward motion while turning ie when the diff would be called into play because of the different rotation speeds of the rear wheels it would make a ugly noises. I had to take it to the dealer twice to get it diagnosed. I went to school with the service manager so I told him to take the car home so he could hear the noise.

They diagnosed it as the diff, not the Haldex. They changed the oil and i have not heard a peep from the diff since and that was around 50,000k's ago.

When I told my mate who is a very good mechanic/engineer he said that it was quite common with Commodores also. Change the diff oil and all is good.

[poozey]

just cost me small packet to replace my haldex unit. some bozo in the past used the wrong oil and it stuffed the clutch system. I had either 0% or 100% drive through the haldex, so tight corners were like a 4WD with diff lock on, lots of bouncing and poor steering. was cheaper to replace the haldex and diff with a 2nd hand unit than get a new haldex clutch pack from VW.

[goodfella]

Where did you get the used unit from?? These parts a PITA to find at wreckers!