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The bis valve is linked to the axle, it increases braking effort to the rear as the rear sits down, i.e. if you have passengers.
When you lower the car it artificially thinks that there is more load on the rear and more effort is biased to the rear. THis will cause the rears to lock.
To adj it, get under the car, undo the locking nut on the bias valve (attatched to the axle via a spring/rod) and undo it. If you dont have a pressure gauge, which not many do, then best thing to do is just to test it and keep unwinding it until the fronts lock just before the rears.
When you lower the car it artificially thinks that there is more load on the rear and more effort is biased to the rear. THis will cause the rears to lock.
To adj it, get under the car, undo the locking nut on the bias valve (attatched to the axle via a spring/rod) and undo it. If you dont have a pressure gauge, which not many do, then best thing to do is just to test it and keep unwinding it until the fronts lock just before the rears.
