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:

• Aircraft brake master cylinders are prone to diverse failures, including internal defects (e.g., stuck bypasses, torn O-rings, contamination), mechanical breakage (e.g., sheared piston rods or cotter pins), and assembly issues (e.g., unthreaded glands).
• These malfunctions consistently lead to a reduction or complete loss of braking capabilities, requiring component replacement, extensive repair, or proper reassembly to restore safe aircraft operation.

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