Landcruiser AWD L6-4.5L (1FZ-FE) (1997)
Brake Proportioning/Combination Valve: Pressure, Vacuum and Temperature Specifications
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With front pressure @ 3,434 kPa (498 psi), rear pressure should be 3,434 kPa (498 psi).
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With front pressure @ 5,396 kPa (783 psi), rear pressure should be 3,630 to 4,218 kPa (527 to 612 psi).
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With front pressure @ 9,810 kPa (1,424 psi), rear pressure should be 4,513 to 5,494 kPa (655 to 797 psi).