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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 516 (Conventional Brake System) >> Power Brake Unit Inspection >> Power Brake Unit Function Inspection (Inspection using gauges) >> Checking for hydraulic pressure

Checking for hydraulic pressure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the engine is stopped (vacuum 0 kPa {0 mmHg, 0 inHg}  ) and the fluid pressure is within the specification, the unit is operating.
    Pedal force Fluid pressure
    196 N {20 kgf, 44 lbf} 740 kPa {7.55 kgf/cm2,107 psi}
  2. Start the engine. Depress the brake pedal when the vacuum reaches 66.7 kPa {500 mmHg, 19.7 inHg}  .
    • If the fluid pressure is within specification, the unit is operating.
    Pedal force Fluid pressure
    196 N {20 kgf, 44 lbf} With ABS (BP with TC (vehicle equipped with 17 inch wheel)):4,700 kPa {48 kgf/cm2, 683 psi}
    With ABS (vehicle equipped with 15 and 16 inch wheel):7,200 kPa {73 kgf/cm2, 1,038 psi}
    Without ABS (vehicle equipped with 16 inch wheel):4,700 kPa {48 kgf/cm2, 683 psi}
    Without ABS (vehicle equipped with 15 inch wheel):7,200 kPa {73 kgf/cm2, 1,038 psi}