T100 Extra Cab Pickup 4WD V6-3.4L (5VZ-FE) (1997)
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Brake Proportioning/Combination Valve: Pressure, Vacuum and Temperature Specifications
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With the front pressure @ 1,960 kPa (285 psi) the rear pressure should be 1,960 kPa (285 psi).
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With the front pressure @ 3,920 kPa (570 psi) the rear pressure should be 2,352 kPa ± 196 (342 ± 28.5 psi).
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With the front pressure @ 6,860 kPa (997.5 psi) the rear pressure should be 2,940 kPa ± 343 (427.5 ± 50 psi).