GrumpyGel
Well-Known Member
...and snaps off ...usually.
freelandy2004
Active Member
hi when you do the ''one wheel up test'' does it matter if it has been driven before or not
will this affect time results
cheers
will this affect time results
cheers
Nodge68
Well-Known Member
It doesn't really matter if the vehicle has been driven or not. The times are slightly different for a warm VCU compared to a cold one, but not much. A few seconds difference is all you'll see between them.
Nodge68
Well-Known Member
Possibly, the last test was done before I had rebuilt the rear brake assembly. I'm not going to complain though as my VCU is better than I thought.
kwondo
Member
Hi Nodge68 I also have replaced my rear brake shoes just before my recent MOT, passed with no advisories at 140k miles 2005 td4 , prior to all the recent snow just done owut with a time of between 120 to 130 seconds. yes that's over 2 minutes. Been out in the snow today and 4x4 seems to work fine up a steep hill and down, full lock forward and reverse. no strange noise, apart from when I tried using hdc control, seems to really control the speed of decent, as if brakes are applied momentary, presume this is normal?Possibly, the last test was done before I had rebuilt the rear brake assembly. I'm not going to complain though as my VCU is better than I thought.
question? should I be worried about my vcu damaging my ird or is it too late ?....all seems to work fine at the moment. thanks
Nodge68
Well-Known Member
Banging when HDC is active is normal, and yes it grabs the brakes on each corner to maintain the speed.
I'd change your VCU asap and hope it hasn't completely trashed the IRD. Definitely change the oil in both the IDR and rear diff.
kwondo
Member
would t be worth changing the both oils before changing the vcu to see if it makes a difference? if when driving the ird or vcu fails what would happen? is it dangerous?
Nodge68
Well-Known Member
Changing the oils in the IRD or diff won't fix the VCU. The VCU needs to be replaced or at least removed until you can obtain a functioning replacement. Leaving a stiff VCU will cause the IRD to fail and often explode to pieces. This renders the vehicle undriveable and normally impossible to move without being winched onto a lorry. The IRD is expensive to replace, so it's very sensible to replace the VCU before damage is done.
kwondo
Member
thanks for the advice, I better get a vcu and oils and have a go, cheers
Alibro
Well-Known Member
When I buy a Freelander (I've had 5) the first thing I always do is the OWUT and if it is bad (over 1.5 minutes) I take the prop shaft off while waiting to get it sorted. The car will drive fine without it for 95% of normal driving. Todays snow being the exception.
I spent a sizeable part of today ploughing through snow drifts and my Freeby was brilliant.
kwondo
Member
yes mine drove great and didn't let me down, its the first freelander ive owned and bought it in 2014 , will still have to use it through the snow, will try and do the vcu after all the snow l goes, fingers crossed that landy will lasts that long !When I buy a Freelander (I've had 5) the first thing I always do is the OWUT and if it is bad (over 1.5 minutes) I take the prop shaft off while waiting to get it sorted. The car will drive fine without it for 95% of normal driving. Todays snow being the exception.
I spent a sizeable part of today ploughing through snow drifts and my Freeby was brilliant.
Alibro
Well-Known Member
It'll be fine so long as your tyres are all the same and the correct pressures. My current Freeby had a OWUT time close to three minutes when I bought it and no sign of damage.
Probably more due to good luck than good judgement by the previous owner.
kwondo
Member
thanks for the optimism Alibro and yes 2 new tyres fitted to the rear and 2 year olds on the front, also had the 4 wheel alignment done at the same time, all four Pirelli scorpions.
GrumpyGel
Well-Known Member
I take it you are not a Professor in an engineering field?
davidsmith1307
Well-Known Member
Yes. The two halves rotate at different speeds for the large majority of the time.
Alibro
Well-Known Member
LOL, ya grumpy auld bu@@er
It's a common mistake for Newbies to completely misunderstand what "fail" means for a VCU. When they fail they become stiffer so become more like a solid prop. This is bad for the same reason you don't have a solid rear axle, ie the wheels need to be able to rotate at different speeds or bad stuff happens. Failure happens over time and mileage.
