Checking For Hydraulic Pressure

If fluid pressure is within specification (vacuum 0 mmHg) when engine is off, the unit is operating properly.

Fig 1: Hydraulic Pressure Chart Engine Off

Fig 2: Testing Hydraulic Pressure Engine Off
Start engine. Depress brake pedal when vacuum reaches 19.7 inHg (500 mmHg). If fluid pressure is within specification, unit is operating.

Fig 3: Hydraulic Pressure Chart Engine On

Fig 4: Testing Hydraulic Pressure Engine On