The brake pressure regulator is adjusted with the vehicle unladen. "Unladen" means: the weight of the vehicle ready for the road (full tank, spare wheel, vehicle tools, vehicle jack, driver in vehicle).
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Raise vehicle and connect the pressure gauges to front left brake caliper and to the rear right wheel brake cylinder/brake caliper, and bleed both pressure gauges.
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Lower vehicle and bounce the rear of the vehicle several times.
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Depress brake pedal and measure pressures at both axles.
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Compare figures attained with specifications → Chapter and if necessary adjust.