I had similar when i had my 350Z as it had a LSD. found a local MOT center which used pressure plates to test the brakes. At first glance looked like a floor lift but the reversed the car off then drove on with a bit of speed. slammed on an the sensors calculated the brake bias etc. Very clever bit of kit. Will be taking the RR there come MOT time.

Most people would not be so familiar with the MOT procedure, I wonder how many 4x4 owners get stiffed for faulty breaks, and leave with damage to their 4WD components all because the tester does not follow the correct procedure.

The garage needs reporting, and their testers clearly need more training.

Thanks for posting Dan, as now all the FFRR readers (myself included) will look out for this in the future.

JustinP 
Gone - Range Rover Supercharged 2006

i had this discusion with my local tester about a range rover he had on the rollers (p38), he said they use the rollers but never run both wheels at once. he tested one brake then the other (same axle) and compared the readings but never ran both wheels at the same time.

surly you transfer box would be smashed to pieces now ? 2007 TDV8 Vogue SE

arron wrote:

i had this discusion with my local tester about a range rover he had on the rollers (p38), he said they use the rollers but never run both wheels at once. he tested one brake then the other (same axle) and compared the readings but never ran both wheels at the same time.

I hope you won't be taking your vehicle in there then!

There is only one correct way to do it and that's with the Decelerometer.
My local MOT garage hardly ever does 4x4s but they are well aware of the correct proceedure, and have done it correctly on my Defender.

I'm pretty sure drivetrain components are not designed for speed differences between back and front or left and right wheels.

arron wrote:

i had this discusion with my local tester about a range rover he had on the rollers (p38), he said they use the rollers but never run both wheels at once. he tested one brake then the other (same axle) and compared the readings but never ran both wheels at the same time.

I suppose an axle diff is easier and cheaper to repair than the centre diff at least.

The VOSA instructions speciffically say not to - so fail to understand why the testers do. 

Don't know what year the electronic handbrake came in but don't fancy the idea of this being activated at 20mph as stated in the VOSA guidelines. I tried engaging it at a couple of mph only and that was severe enough. Don't know if it would do the car any good either.

As long as it wasn't my pride and joy would take great pleasure watching the event though as the tester engages e-brake on road at 20 mph! Think it could be rather surprising and painful as seatbelt locks too...

Guys,

We have a top of the range MAHA MOT test lane which is used to test Range Rovers all the time, it is important that we set it up by clicking on the "pseudo 4wd" icon as this allows the 2 individual brake rollers to rotate in different directions at the same time, allowing the diff to work as normal, the braking load produced at each wheel can then be measured.

Unfortunately most simple brake testers will not allow you to do this.

Stephen

long way for me to go to get a mot test..  ... - .- -.




Y. O. L. O.
.

Scarey,

There's a cup of tea or a nice pint waiting for you, if you ever fancy visiting!

Stephen

...and a refund for the diesel ,ferry and the doughnuts i brought on the way.....see you soon stephen.

just noticed you have a very unusual white RR, any chance of some pics.  ... - .- -.




Y. O. L. O.
.

just a quick question from a long time lurker/short time member.are these vehicles vehicles equiped with lsd's in the front or rear or both axles as standard?.

Middle LS Diff - with 4 channel traction control.

The later models have a lockable rear diff. 

Hi all,

Newbie to the forum! Saw this post and thought and had to comment!!!

I have been going to Riverway MOT for years and have never had a problem. I have had a fair few range rover classics and discoverys 1+2 mot'ed there.

Not to mention my present L322 and previous mot'ed there with out an issue.

[quote="Fox"]

arron wrote:

I'm pretty sure drivetrain components are not designed for speed differences between back and front or left and right wheels.