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This is from the HJ service manual. The pressure switch is set the same for all brakes but discs have the proportion valve to prevent rear lock up.
You can't read it but it says
A brake differential switch is fitted to all models and illuminates a light on the instrument panel if pressure differential between front and rear brake circuits exceeds 120-170psi. On disc brake models the pressure switch is combined with a brake pro portioning valve.
So no doubt there many updates in the 10 years of production after this.
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