Checking For Hydraulic Pressure

When the engine is stopped (vacuum 0 kPa {0 mmHg, 0 inHg} and the fluid pressure is within the specification, the unit is operating.

Fig 1: Pedal Force & Fluid Pressure Specifications (Engine Stopped)
Courtesy of MAZDA MOTORS CORP.
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 the specification, the unit is operating.
- If the fluid pressure is not within the specification, inspect for damage on the check valve or vacuum hose, and fluid leakage of the brake hydraulic line. Repair as necessary, and inspect it again.
  
  Fig 2: Pedal Force & Fluid Pressure Specifications (Engine Running)
  Courtesy of MAZDA MOTORS CORP.