PREVOST H3-45 VIP Owner's Manual page 142

5-20 Other Features
2. Air leakage Monitor
The Air Leakage check allows the driver to accurately measure the amount of air
pressure drop in the front and rear brake air systems. After selecting this test from
the DID, you are prompted to apply the service brake for 60 seconds. After
applying and holding the service brake for 60 seconds, the DID will display the
amount of pressure drop in the brake system.
Before starting the test through the DID, complete the following:
A. Chock the wheels to prevent the vehicle from rolling.
B. Start the engine and check that the brake systems air pressure is greater
than 100 psi.
C. Turn engine off.
D. Release the parking and service brakes and allow the system to settle (air
gauge needle stops moving).
E. Press the ENTER button to start the test.
F. If the air tanks pressure is too low to perform the test (pressure must be
greater than 100 psi), the following messages will appear.
G. You must press and hold brake pedal for 60 seconds, as instructed.
H. Once the brake pressure test is completed the pressure leak test results are
displayed.
PA-1619 Owner's Manual H3-45 VIP