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High Pressure Leak Test

WARNING: This page is about a different car, the 1994 BMW 525iT. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check brake system for proper operation and leaks. Remove front wheel and caliper bleeder screw. Attach Pressure Tester (32-4-000) to one side of brake circuit.
  2. With engine off, apply about 150 lbs. (67 kg) of pressure to brake pedal.
  3. On all models, the hydraulic line pressure should increase to 710 psi (50 kg/cm2 ). After 2 minutes, pressure should not drop more than 57 psi (4 kg/cm2 ). Repeat test on other side of brake circuit.
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