It should be fairly obvious how the thing works, just work out what's not connected and which way the ''load sensing valve'' rod should move, usually they are mounted up on the chassis out of harms way with a simple rod connecting to the rear axle, as the rear springs compress the rod pushes the valve lever upwards.

A search online might produce some pics so you could make some temporary adjusting rod up, if that proves impossible then if it were me i'd cable tie the lever into the position it should be for the journey, and don't forget to alter this when the weight changes, i'd err on the side of less braking at the rear than more, but if you are fully loaded then minimal rear braking would not be good, possibly leading to front brake fade under heavy or polonged braking if loaded well.

If you have a quiet slippery road nearby you could do a quick experiment to see how moving the lever affects braking, better an hour sorting this than have an easily avoidable accident.

I've had to resecure load sensing fitments on lorries on the road during journeys to keep them working correctly, i used to keep a stock of large elastic bands which were in fact oversize bands cut from old inner tubes, which were the staple securing device for lorry trailer number plates of yore, these make good temporary felixible bindings.

Edited by gordonbennet on 26/08/2017 at 10:43