Just reading through the Nissan Patrol Manuals and thought this might benefit others, the following document- Nissan Patrol Reference Document discusses a bit of everything, but, the bit I found useful and which I have just performed is to do with the BSPV.
It states, if you have a lift on your vehicle (whatever the lift) the BSPV needs to be raised to meet that lift. If this is not done, you won't have any assistance from the back brakes when pulling up, especially if vehicle is heavily loaded. It gives you spring measurement, angles(showing relation of spring to arm) and pictures, eg, I have a 2" lift, so raised the arm 2". Just took it for a brake test run and could not believe the difference it made, I don't think my rear brakes have been working properly since the lift went in about 8 years ago.
It was simply a matter of undoing the arm and putting a bit of flat metal in and therefore raising the arm up, assuring the spring measurement and angle were correct.
I hope this helps others
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