Haldex Service VW Audi (GEN 4 Filter replacement & Torque specs)

How to service a Haldex coupling, change the fluid G055175A2, used on most VW and Audi rear differentials. How to identify the Haldex fitted = GEN 4 units have the filter above the haldex pump and Gen 5 omitted this filter.

How to service the differential side of the Haldex unit
   • Differential Service - Audi / VW (Hal...  

This is a useful video which shows you both ways of completing a Haldex service on your Audi / VW / Skoda car. The tools required are fairly basic from a nose plier, flat screw driver, Groove Joint Plier also called monkey pliers. Ratchet set with different sockets, Hex Bit Socket Set or allen keys, a torque wrench, oil pan, oil pump or syringe. The parts can be seen in the video, main thing is the Haldex service kit.

It is critical that the vehicle is level during the whole process, especially when filling in the new fluid either using ramps, jack stands, a jack or even a hoist which would be ideal. Vaico, Febi, Liquid Moly, genuine VW, Borg Warner all make the haldex oil / fluid. Borg Warner is the creator of the Haldex system. The process is almost similar to a standard differential service with the key difference being the temperature of the fluid which has to be between 20°C to 40°C (68F = 104F). As seen in the video this can be monitored with VCDS (Vag com) or a probe type thermometer.

Service schedule is 60,000kms under normal driving conditions. If the vehicle is used in harsh environments, towing or race conditions this will bring the service interval down significantly.

---- Time stamps Haldex Service ----
0:00 - Start of Haldex Service Generation 4
4:09 - Opening fill bolt & filter bolts
6:04 - Turning on the pump using VCDS
8:32 - Removing Drain & fill bolt
9:32 - Removing filter & cleaning
12:04 - New VS Old Filter
12:52 - Installing new haldex filter
13:43 - Torque specs / settings for bolts
14:07 - How to Fill Haldex fluid
14:45 - Check Haldex Fluid level
15:50 - Tightening / Torque fill bolt

Pump bottle used in the video is similar to one one below:
https://www.ebay.com.au/itm/302843253804

Disclaimer: This video was created for informational and educational purposes only. I cannot guarantee against the improper use or unauthorised modifications of this information. No liability for property damage or injury incurred as a result of any of the information contained in this video is assumed. Use this information at your own risk. I recommend safe practices when working on vehicles and with tools seen or implied in this video. You are using the information and automotive parts shown in this video solely at your own risk. It is not intended to be a substitute for the professional advice of a service centre or mechanic.