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Thread: HDC and Trailer Brakes

  1. #1
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    HDC and Trailer Brakes

    Does anyone know with certainty if a correct installation of a trailer brake controller would activate the trailer brakes when using hill descent control?

    Our D4 had a red arc unit installed when we bought it, and it applies the brakes as expected when driving on road, however I noticed nothing happened back there when using HDC on a steep track. Confirmed, by pressing the foot brake mid way, and feeling the trailer pull up.

    Iíve never bothered checking the wiring because it works on road just fine, and I live by the Ďif it ainít broke, donít fix ití mantra :-)
    2010 TDV6 3.0L Discovery 4 SE, Alaska White, GME XRS-330c, IIDTool BT, Traxide D3-DU Dual Battery Kit, Apple CarPlay, Power and Heated Seat retrofit, Rhino Rack Batwing Awning (Part time install), BFG KO2 for play

  2. #2
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    Quote Originally Posted by veebs View Post
    Does anyone know with certainty if a correct installation of a trailer brake controller would activate the trailer brakes when using hill descent control?

    Our D4 had a red arc unit installed when we bought it, and it applies the brakes as expected when driving on road, however I noticed nothing happened back there when using HDC on a steep track. Confirmed, by pressing the foot brake mid way, and feeling the trailer pull up.

    Iíve never bothered checking the wiring because it works on road just fine, and I live by the Ďif it ainít broke, donít fix ití mantra :-)
    It should do as the brake lights operate when HDC is active (I tested this once).
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)

  3. #3
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    I think it does Veebs , the operative word is Ď thinkí , however on some steep descents I just use the button on the redarc and rely more on the van brakes.

    Must add this is on dirt or gravel tracks

    dave

  4. #4
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    If the brake controller is wired to the D4 brake lights then yes it will activate the trailer brakes when HDC applies the D4 brakes. At least it does with my MY14 D4, it also worked the same way with my MY03 D2.
    2014, MY14 Discovery TDV6, Fuji White (2018-Now)
    2003, Discovery 2a, Td5 Manual, Zambezi Silver (2012-2018)
    2007, Adventure Offroad Campers, Grand Tourer (2015-Now)

  5. #5
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    Hdc is LOTs of small pulses, to get the trailer to assist more - wind up the redarc controller

  6. #6
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    Thanks all - Iíll wind the level up next time and see if it makes a difference.

    Iíve noticed the brakes on the trailer are pretty sluggish, coming on and off slower than the car. Not sure if thatís normal, but if we are talking fast pulses, I doubt it would react in time. Would love to be wrong :-)
    2010 TDV6 3.0L Discovery 4 SE, Alaska White, GME XRS-330c, IIDTool BT, Traxide D3-DU Dual Battery Kit, Apple CarPlay, Power and Heated Seat retrofit, Rhino Rack Batwing Awning (Part time install), BFG KO2 for play

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