The load sensing valve varies the pressure applied to the rear brakes according to how low the vehicle is riding. It is very important to have it in good order, since Hymer chassis are permanently loaded. I have mine serviced yearly, and afterwards I always notice the difference. The back brakes work much harder than the fronts, which although they are discs, contribute much less to overall braking because there is less rubber on the road and much less weight at the front. This is less of an issue on the 5 series, but much more important on the double wheeled, rear heavy, 6 and 700 series.
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