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Home >> BMW >> 1985 >> 528e Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc & Drum >> Testing >> Brake Master Cylinder >> Low Pressure Test

Low Pressure Test

  1. Test both brake circuits. Set pedal force meter to have a testing pressure of 28-70 psi (2-5 BAR) in brake system. Vehicle and meters must remain still, since any motion would produce the wrong readings.
  2. Pressure should remain constant for at least 5 minutes. If pressure drops considerably, check all rubber components in brake system for leakage (wheel calipers). Bleed calipers after finishing test.