R

RobCavendish

New Member
Does anyone know whether a RRC viscous coupling is likely to be damaged by an MOT rolling road brake test, if a two wheel road is used, as this is all that most garages have? My MOT is due shortly and I really don't want the brake test to damage my new viscous coupling. On a similar vein, is it important to keep the diameter of all tyres similar in order to keep the VC happy?
Thanks again for your interest, I hope that all these transfer box questions are not too boring, I'll move on to something else soon:D
 
Yes tyres must be within 2mm of each other to prevent wind up.

Volvo v70R has viscous.(and has this problem 1200quid job)

same as Xc90 volvo.

I wouldnt take a chance on the rollers myself.
 
As far as I am aware the range rover is not that critical on Tyres yes you can use a 2 wheel rolling road as long as it is a very new double clutch rollers but not many have them unless it is a very new test station
 
i have only been to the tessting station once with our range rover, they did a manual brake test with a device they put in the footwell and drove the car up the road>

Believe that is fairly normal for a car with permanaent 4 wheel drive

Our local testing station is fairly switched on as we are a rural area and he runs a 4 x 4 himself
 
I have always been told, that you can't test a permanant 4x4 on a set of 2 rollers, they either need 4 rollers or use the footwell device.

Was also told that you cat put a car with an LSD ona 2 roller system
 
i would want all four wheels turning even if vc is protected theres still diff thats not going to like sudden spinning
 
when i took my p38 dse for test (ireland) they didnt put it on the rolling road thats a while back but im being tested tomorrow so will post tomorrow evening/night
 
a modern rolling road will have a "4 wheel drive" mode,basically one wheel rotates in the opposite direction to the other on the same axle.
 
Thanks everyone for your thoughts on this issue, I'll be asking my local MOT station to carry out a road test rather than risk the rollers!
The idea of contra rotating wheels sounds like a good one though, I've not heard of that idea before.
 
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