Brake Master Cylinders

After a brake master cylinder was installed, the technician was unable to bleed the brake system. Fluid pulled from reservoir would return to reservoir through the same line as the internal bypass was not functioning properly. Master cylinder was disassembled and bypass was found stuck and unable to move. Metal shavings were found inside, and an O-ring was torn, with black specks mixed in with the shavings. Part replaced with new master cylinder.

Key Takeaways:

• Brake master cylinders are a frequent point of failure, experiencing issues ranging from internal contamination, torn seals, and stuck components to manufacturing defects and improper assembly.
• Mechanical failures, such as sheared piston rods or retaining pins, also lead to brake system malfunctions, sometimes due to inadequate component strength or improper installation/adjustment.
• These diverse issues across various aircraft types consistently result in compromised braking capability, from spongy pedals to complete loss of brake function.

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