High-Pressure Test

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2005 BMW 760i, 2005 BMW 760Li, 2005 BMW 745i, 2005 BMW 745Li, and 2004 BMW 760i. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Perform test on both brake circuits, front and rear.

Unscrew vent plug, connect pressure tester and vent. See Fig 1.
Load brake pedal with a force of approximately 112 lbs. (500 N), and block pedal with pedal support.
After 2 minutes, pressure must not drop by more than 8 percent.
Perform low-pressure test. See LOW-PRESSURE TEST .

Fig 1: Connecting Pressure Tester

Courtesy of BMW OF NORTH AMERICA, INC.