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Thread: D4 Suspension Problem

  1. #1
    Join Date
    Feb 2016
    Location
    Melbourne
    Posts
    263

    D4 Suspension Problem

    Hi
    i have an issue of front passenger side being lower than driver side, around 15mm on average.
    It can be more in the morning.
    After driving it comes up to within 10-15mm difference.
    To me the front looks like its sitting low.
    If it was losing air, wouldnt the whole car drop?

    One suggestion has been a height sensor.
    I did damage one a few years ago and was replaced, massive pot hole.
    Im wondering if another is faulty also.

    Following the car on the freeway it looks like it is leaning down to front corner.

    Any thoughts would be greatly appreciated.

    cheers

    Vin
    2016 SDV6SE D4
    Mitch Hitch, Llams, IID Tool, Traxide, Tow Pro, GME UHF,
    Rhino Traddie Rack, 18 Tuff Ants, BFG KO2, ARB Bull Bar, Runva 11XP, APT Sliders & Underbody Guards, Long Ranger Aux Tank

  2. #2
    Join Date
    Jan 1970
    Location
    NSW SW Slopes
    Posts
    10,670
    Leave overnight with the 20A suspension system fuse removed. This will prevent periodic levelling which will then allow a leaking corner to lower by itself. Leaking can be from an air-spring or the corner valve in the valve block.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  3. #3
    Join Date
    Feb 2016
    Location
    Melbourne
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    263
    Thanks Greame
    So you think a sensor, more likely air leak.
    Looking at it today and comparing to other D4s I see around, the whole front is sitting low.
    Very frustrating.
    I think its been that way for a while, now that I think about it.
    Vin
    2016 SDV6SE D4
    Mitch Hitch, Llams, IID Tool, Traxide, Tow Pro, GME UHF,
    Rhino Traddie Rack, 18 Tuff Ants, BFG KO2, ARB Bull Bar, Runva 11XP, APT Sliders & Underbody Guards, Long Ranger Aux Tank

  4. #4
    Join Date
    Jan 1970
    Location
    NSW SW Slopes
    Posts
    10,670
    An air leak is easy to confirm or rule out and needs to be ruled-out before considering sensor calibration.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  5. #5
    Join Date
    Feb 2016
    Location
    Melbourne
    Posts
    263
    Hi
    Last night I measured both sides of car, 4mm difference for the record.
    Pulled the fuse.

    This morning the car had not dropped at all, mm perfect.

    I monitor as I drive it today.

    The front still seems too low compared to back.
    I will compare against friends D4 today.

    Thanks
    2016 SDV6SE D4
    Mitch Hitch, Llams, IID Tool, Traxide, Tow Pro, GME UHF,
    Rhino Traddie Rack, 18 Tuff Ants, BFG KO2, ARB Bull Bar, Runva 11XP, APT Sliders & Underbody Guards, Long Ranger Aux Tank

  6. #6
    Join Date
    Mar 2016
    Location
    Perth
    Posts
    3,140
    Quote Originally Posted by rhinosm View Post
    Hi
    Last night I measured both sides of car, 4mm difference for the record.
    Pulled the fuse.

    This morning the car had not dropped at all, mm perfect.

    I monitor as I drive it today.

    The front still seems too low compared to back.
    I will compare against friends D4 today.

    Thanks
    Take measurements from the wheel arch to the hub centre. Front should be 466mm, rear 485mm. That will tell you if its sitting low.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  7. #7
    Join Date
    Sep 2014
    Location
    Baldivis WA
    Posts
    1,502
    Re calibrate the height sensors now that you've established there's no leak.

  8. #8
    Join Date
    Feb 2016
    Location
    Melbourne
    Posts
    263
    Thanks
    whats involved in Re calibrating sensors?
    vin
    2016 SDV6SE D4
    Mitch Hitch, Llams, IID Tool, Traxide, Tow Pro, GME UHF,
    Rhino Traddie Rack, 18 Tuff Ants, BFG KO2, ARB Bull Bar, Runva 11XP, APT Sliders & Underbody Guards, Long Ranger Aux Tank

  9. #9
    Join Date
    May 2014
    Location
    Point Cook, VIC
    Posts
    1,572
    Quote Originally Posted by DiscoJeffster View Post
    Take measurements from the wheel arch to the hub centre. Front should be 466mm, rear 485mm. That will tell you if its sitting low.
    And unless you are in Tight Tolerance Mode, individual heights can vary by up to 10mm. So it is possible to see a 20mm difference across the front or rear.

  10. #10
    Join Date
    Feb 2016
    Location
    Melbourne
    Posts
    263
    So heights front-end rear look good on driver side, 465 & 485
    Passenger side 10mm both front and back.
    Would that be considered normal?
    Vin
    2016 SDV6SE D4
    Mitch Hitch, Llams, IID Tool, Traxide, Tow Pro, GME UHF,
    Rhino Traddie Rack, 18 Tuff Ants, BFG KO2, ARB Bull Bar, Runva 11XP, APT Sliders & Underbody Guards, Long Ranger Aux Tank

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