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Connect a pressure gauge, vacuum gauge, and pedal depression force gauge as shown in figure below. After Use commercially available gauges and pedal depression force gauge. 1. Checking for vacuum loss (1) Unloaded condition A. Start engine. B. Stop engine when vacuum gauge reading reaches 19.7 inHg (500 mmHg). C. Observe vacuum gauge for 15 seconds. If gauge shows 18.7~19.7 inHg (475~500 mmHg) unit is operating. (2) Loaded condition A. Start engine. C. With brake pedal depressed, stop engine when vacuum gauge reaches 19.7 inHg (500 mmHg). operating. 2. Checking for hydraulic pressure (1) If fluid pressure is within specification(vacuum 0mmHg). When engine is off, the unit is operating properly. |