Hi, can someone explain HOW this works, does it utilise brakes or something else?
When I switch mine on it holds the car on an incline allowing slow travel.. BUT it makes groaning noises like something binding??
Do they all do this or have I a problem? Thanks.  2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?

I think the noise you have is the system using the brakes etc. to control the car's rate of progress. It appears to pulse the brakes quickly (or not quickly), seeming like it's not at all well.

I've tried mine on a snowy/icy road decent and that's what it sounded like. Left it do it's own thing and the wife was rather apprehensive. Me, of course not . No doubt someone will be along shortly to put us right. Cheers
Richard

(there are no such things as an ordinary FullFat, an ordinary cat or too many tools)
2011 TDV8 Vogue Santorini Black
Gap IIDBT

Sound is normal. Brakes doing their job  2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
New Defender D300 90 on order so "Rory" will be going to a new home....!
1974 Series 3 Lightweight = "Millie"
My preferred specialist: www.glenrands.co.uk
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Mmm? I wasn't sure if it was using brakes or a kind of telmar system as used on some buses/trucks where electromagnets are energised on the propshafts to create a "drag" to reduce speed.. OK as long as the sound we hear is the norm then, fine, thanks. 2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?

We've got enough electrickery on ours without the prop brake system. Hope no one from JLR reads this or we will have more things they can engineer to go up  Cheers
Richard

(there are no such things as an ordinary FullFat, an ordinary cat or too many tools)
2011 TDV8 Vogue Santorini Black
Gap IIDBT

Mine used to make an awful grinding sound when HDC was selected just as you describe, However, the target descent speed can be adjusted using the cruise control + or - buttons on the steering wheel. I adjusted mine relative to the gradient while HDC was in operation and was able to greatly reduce the grinding and banging noises.
Hope this helps.

Well ya learn something new everyday! I'll give it a go, ta!  2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?

Use mine when descending out of a multi-story car park in Warrington. Reassured with all the creaking and juddering, as know that the system is working correctly! Previous cars:
S-Max 2007-2013 (only diesel I've had, good car but expensive when diesely bits go wrong, so what's the point?)
Galaxy 2001-2007
Mondeo Estate 1997-2001
Sierra Estate 1993-1997
Uno Turbo 1987 -1993
Fiesta 1984 - 1987
Fiat 127 1982 - 1984

I have to say that mine is silent in operation! I'm sure its working though. 2010 4.4 TDV8 Vogue SE

If its merely using the brakes, how is that better than me using the brake pedal?  2008 L322 Vogue 3.6 TDV8 in Java Black with parchment and Navy interior. 125000mls.

I used to be indecisive and have a split personality... but we are ok now...I think?

It will be calculating the variation between each wheel speed against perhaps the measured acceleration of the car and applying differing retardation to each wheel via the brakes. (I think) It will be likely more complicated than that but you get the idea. Cheers
Richard

(there are no such things as an ordinary FullFat, an ordinary cat or too many tools)
2011 TDV8 Vogue Santorini Black
Gap IIDBT

You can’t brake each individual wheel at varying levels to keep the car straight, using information from the sensors around the body.

I might be making an assumption there of course, you could have become fully assimilated..... Borg style.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

HDC is really for decent of slippery/difficult terrain decent where just using the brake pedal would result in a side slip, the HDC as above has been said uses each wheel retardation individually to balance the braking effort keeping the vehicle in a controlled decent, basically it’s not really for your multi story car park  David

Please let me know if my comments upset you, I may wish to upset you again.

Rapiscan wrote:

If its merely using the brakes, how is that better than me using the brake pedal?

get yourself on a 1:4 snow/mud covered hill and you will see the benefits, bloody noisy but does a great job

MJ

Me assimilated, I'm more likely to be exterminted by those pesky beasts with toilet plunger arms . And anyway, the steering is always done by the most dangerous nut on the car, the one holding the steering wheel

Rapiscan,

This is probably the only time we're happy the the FF making an unusual noise. As Rosco says, get to a hill, with lots of no grip and go  Cheers
Richard

(there are no such things as an ordinary FullFat, an ordinary cat or too many tools)
2011 TDV8 Vogue Santorini Black
Gap IIDBT