HDC - Hill Descent Control questions

**irondoc** · 7th November 2013, 08:26 PM

Hi guys, a couple of questions re HDC on my 2011 D4 2.7:

-is the switch illuminated when HDC is on or the headlights are on? Mine is dark with both.
-what speed does it limit you to when it is on? The manual talks about different speeds for different gears, adjusted with the cruise control buttons, but I've had a play with it and it just doesn't seem to work as advertised.

Cheers
Lucas

**NavyDiver** · 7th November 2013, 08:51 PM

jump on a hill. Put it in low range 1st or 2nd. foot off brake and accelerator. You should see HDC indicated on your dash. You should hear the brakes engaging and disengaging on one or two wheels at a time- if is rather freaky the first time you feel and hear it!

Use the speed up/down control on your cruise control to increase/decrease speed.

How fast? Not sure- I only use it on very very steep slippery stuff at a snails pace if possible

HDC will automatically engage when you select some traction modes. Have a look at the FAQ. Play with it before you really need it.

**CaverD3** · 8th November 2013, 10:09 AM

The traction control sign comes up on the dash no light on the switch.

**WhiteD3** · 8th November 2013, 11:07 AM

HDC is enabled in some TR modes in high range and all modes (I think) in low range. You will see the green HDC lamp (downhill car symbol) on the dash. There is no lamp in the switch.

**Redback** · 9th November 2013, 05:25 PM

Originally Posted by WhiteD3

HDC is enabled in some TR modes in high range and all modes (I think) in low range. You will see the green HDC lamp (downhill car symbol) on the dash. There is no lamp in the switch.

Yeah, start the car and just put the car into Rock Crawl or Mud Ruts and the green symbol(car shape) will come up on the dash.

Baz.

JamesH · 10th November 2013, 09:20 AM

Speaking generally about off-road settings, you'll find the booklet put out by Green Oval Experience (gghaggis) very useful.

**connock** · 10th November 2013, 04:27 PM

In my opinion
Try putting it in 1st /2nd low and let the engine braking do its thing so you know you will have a set of nice cool brakes at the bottom if needed

connock

**rodjam** · 10th November 2013, 08:07 PM

I agree with Connick.
I regularly do a very steep and windy descent into a valley.
With my Kimberley Kamper attached, weighing 1.8 t with water etc.
The first few times with hill descent, the brakes lit up after 10 mins and had to wait some time to cool sufficiently.
That's even with the electric brakes turned up.
After about 10 descents trying various settings tried manual low and engine braking...
Works much better IMO!
Without the van, hill des is fine.
Just my experience!

**101RRS** · 10th November 2013, 08:34 PM

Originally Posted by JamesH

Speaking generally about off-road settings, you'll find the booklet put out by Green Oval Experience (gghaggis) very useful.

So is the car Handbook that outlines all of this.

Garry

**camel_landy** · 1st December 2013, 07:58 AM

Originally Posted by irondoc

Hi guys, a couple of questions re HDC on my 2011 D4 2.7:

-is the switch illuminated when HDC is on or the headlights are on? Mine is dark with both.
-what speed does it limit you to when it is on? The manual talks about different speeds for different gears, adjusted with the cruise control buttons, but I've had a play with it and it just doesn't seem to work as advertised.

Cheers
Lucas

OK... Testing HDC on the D4.

Firstly, give the HDC button a firm press and make sure the system is coming on (the green icon on the dash should come on). If it comes on, turn it off and go find yourself a long, straight slope (black top will be fine).

Position the car at the top of the slope, so it can start rolling down the hill. As HDC will work in Neutral on the D4, turn on HDC, slip it into Neutral, FEET OFF ALL PEDALS and let the car start to roll GENTLY down the hill.

If HDC is working, your speed shouldn't get more than approx 10km/h, with the rumbling of the ABS system working in the background. You can increase or decrease your speed by using the +/- buttons on the cruise control.

Once you've confirmed it's working OK, read up on 'HDC', 'target speeds' and 'engine braking'.

NOTE: The important thing is to not touch any of the pedals. Also, don't operate in Neutral for too long as the ABS pump will eventually overheat.

HTH

M

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