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Home >> BMW >> 2004 >> 745Li >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> DISC - 745i, 745Li, 760i & 760Li >> Testing >> Service Brake >> Low-Pressure Test

Low-Pressure Test

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. Car 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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