Low-Pressure Test
WARNING: This page is about a different car, the 2004 BMW Z4 and 2003 BMW Z4. 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 bleeder screw, connect pressure tester and bleed. See Fig 1 .
- Load brake pedal with a force of 30-72 psi (2-5 bar), and block pedal with pedal support. Car and measuring equipment must remain perfectly still as vibrations will distort 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. See BLEEDING BRAKE SYSTEM .