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Home >> BMW >> 2009 >> 650i 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 131 (DISC - 525i, 530i & 545i) >> Testing >> Service Brake >> Low-Pressure Test

Low-Pressure Test

WARNING: This page is about a different car, the 2005 BMW 545i and 2004 BMW 545i. 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.
  1. Unscrew vent plug. Connect pressure tester and vent. See Figure.
  2. 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 result.
  3. Pressure should remain constant during five minute test.
  4. Check all rubber parts in case of excessive pressure drop.
  5. Bleed brake calipers and wheel brake cylinders after finishing test.
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