How does the Haldex AWD work?
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    1. #1
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      How does the Haldex AWD work?

      Mj__Smith's question concerning his Haldex got me thinking. How does Volvo's Haldex system actually work? I mean mechanically. With the ABS system? Clutch pac? If so, is it electronically or fluid activated? What does it take to engage the rear wheels? How much slippage or is it a true AWD system? Are the rear wheels along for the ride unless needed?

      Can torque be transferred between the rear wheels (side to side)? How is this done? Between the fronts?

      Several years ago the Haldex systems was suppose to be improved. What, exactly, did that mean? Quicker engagement? How?

      I understand 4x4 and AWD systems in general, but not Volvo's system. I'd like a 101 primer, or a place to look for the answer. Thanks.


    2. #2
      Global Moderator GrecianVolvo's Avatar
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    3. #3

      Re: How does the Haldex AWD work? (GrecianVolvo)

      Quote, originally posted by GrecianVolvo »
      http://www.billswebspace.com/HALDEX.pdf

      That's interesting reading. Thanks for posting it Yannis. So, I'm puzzled about something. If the Haldex guide (the pdf file) has a "Mr Exclamation" icon on page 3 indicating how important it is to change the oil and filter in the unit every 20k miles, why doesn't Volvo indicate this in it's scheduled maintenance ?

      2005 XC90 V8 AWD, Silver / Oak, IPD Sways and Endlinks, Shod with Nokians
      CB-shaft failure at 36k miles - thankful for 7yr-100k VIP extended warranty.
      Head-on collision at 49k miles - thankful for being in a Volvo.

    4. #4

      Re: How does the Haldex AWD work? (safetyfirst)

      I saw the same requirement and looked through the manual, no mention....

      2005 XC90 2.5T AWD (car)
      2000 F350 4x4 diesel (truck)

    5. #5
      Global Moderator GrecianVolvo's Avatar
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      Re: How does the Haldex AWD work? (safetyfirst)

      Quote, originally posted by safetyfirst »

      That's interesting reading. Thanks for posting it Yannis. So, I'm puzzled about something. If the Haldex guide (the pdf file) has a "Mr Exclamation" icon on page 3 indicating how important it is to change the oil and filter in the unit every 20k miles, why doesn't Volvo indicate this in it's scheduled maintenance ?

      That is not an OFFICIAL page...I am not sure and every manufacturer has tailored Haldex to their own needs, etc. I did not have the time to look for anything more official.

      2001 Volvo V70 T5 M SR, Classic Red/Graphite Lthr, TME Stage II ECU, 3" Downpipe w/ Cat-back exhaust from MTE, Volvo Roadholding & Lowering Kit w/ Nivomats, 17" PEGASUS, Rear Spoiler, Dolby Surround Sound
      2015.5 S60 T6 Drive-E, Crystal White Pearl w/ Beechwood/Black Sport leather Climate/Platinum/BLIS/Park Pilot/Sport w/ 19" BOR

    6. #6

      Re: How does the Haldex AWD work? (GrecianVolvo)

      I used to own an Audi TT quattro, and it did require the a Haldex service every 20K miles. The pdf above mentioned uses a graphic of a TT so I believe that service reference is based on the first generation of TTs. I also have an A4 but no Haldex service is needed either. So again I guess that reference was only written based on the TT haldex application and it doesn't apply for all haldex systems.

    7. #7
      The A4 does no use a Haldex AWD but a Torsen based unit.

    8. #8

      Re: How does the Haldex AWD work? (Asfalto)

      The PDF describes Haldex gen I, which launched on the first generation Audi TT. Generation II (launched with the XC90) and later Haldex couplings require no oil or filter change. New Volvos use the latest Haldex gen IV units.


    9. #9
      Global Moderator GrecianVolvo's Avatar
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      Re: How does the Haldex AWD work? (Calhon)

      Quote, originally posted by Calhon »
      The PDF describes Haldex gen I, which launched on the first generation Audi TT. Generation II (launched with the XC90) and later Haldex couplings require no oil or filter change. New Volvos use the latest Haldex gen IV units.

      I believe that only the XC60 uses a 4th generation Haldex. Rest of cars use 3rd generation.

      2001 Volvo V70 T5 M SR, Classic Red/Graphite Lthr, TME Stage II ECU, 3" Downpipe w/ Cat-back exhaust from MTE, Volvo Roadholding & Lowering Kit w/ Nivomats, 17" PEGASUS, Rear Spoiler, Dolby Surround Sound
      2015.5 S60 T6 Drive-E, Crystal White Pearl w/ Beechwood/Black Sport leather Climate/Platinum/BLIS/Park Pilot/Sport w/ 19" BOR

    10. #10

      Re: How does the Haldex AWD work? (GrecianVolvo)

      That may be true for the S40 and V50, but all other models use Haldex IV from MY 2009 on, according to Haldex company reports.