here is a wee snip, it will be the centre diff that brakes with this and i dont think it will damage 5th to R, just to not the garage i use to work at for 5/6 years we tested all permanent 4x4 on the road
Vehicles not to be tested on a roller brake tester
Certain vehicles should not be tested on a roller brake tester, eg vehicles
with
- More than one driving axle permanently engaged
- Limited-slip differential
- Belt-driven transmission
- Brakes for which the servo operates only when the vehicle is moving
These vehicles should be tested using a properly calibrated and maintained
decelerometer or a plate brake tester designated as acceptable for the
statutory tests, see Sub Section 3.7 B, page 25, and C, page 26.