Low-Pressure Test
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 BMW M5, 2003 BMW 540i, 2003 BMW 530i, 2003 BMW 525i, and 2002 BMW M5. 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 30-72 psi (2-5 bar), and block pedal with pedal support. Vehicle and measuring equipment must remain perfectly still as vibrations will distort the result.
- Pressure should remain constant during five minute test.
- Check all rubber parts in case of excessive pressure drop.
- Bleed brake calipers and wheel brake cylinders after finishing test.