Towpack
Well-Known Member
Testing any permanent 4x4 on rollers shouldn't be a problem as they all have a center diff of some sort. So long as the diff remains open it will behave just as though the front or back wheels have lost traction. That's the whole point of having a diff lock. The only 'complication' would be a VC in the CD as fitted to later 80's which means the diff is never fully open but acts in effect like a LSD but, personally, I can't see it being an issue for the short duration of the brake test and hasn't been for the last 10 years I've had mine tested. JMO