# SDR GLBA2015010200489

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 1, 2015
- Submitted: January 2, 2015
- Operation: Air carrier
- Aircraft: [N184UX](https://openairdocs.org/aircraft/N184UX), registered now
- Make and model: Beech 1900D
- Registry model: [Beech 1900D](https://openairdocs.org/model/beech-1900d) (OpenAirDocs)
- Aircraft serial: UE184
- Aircraft time: 39,699 hours, 49,228 cycles
- System (JASC): [3243 · Master Cylinder/Brake Valve](https://openairdocs.org/jasc/3243)
- Part: Master Cylinder
- Part number: 9038000133
- Part serial: 4112
- Condition: Leaking
- Location: Cockpit
- Part time: 10,143 hours, 11,893 cycles
- Stage of operation: TX
- How discovered: C
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/GLBA2015010200489

## Discrepancy

THE LT BRAKE PEDAL IS MUSHY & IT MUST BE FULLY DEPRESSED TO ACTIVATE THE BRAKES.  FOUND EVIDENCE TO SUSPECT THAT THE CAPTAIN'S LT BRAKE MASTER CYLINDER, SN 4112, WAS BYPASSING INTERNALLY.  THE CAPTAIN`S BRAKE MASTER CYLINDER WAS R & R IAW BMM 32-40-06.  DURING TROUBLESHOOTING, FOUND THAT THE FIRST OFFICER`S RT BRAKE MASTER CYLINDER, SN 3923, WAS LEAKING.  THE FIRST OFFICER`S RT MASTER CYLINDER WAS R & R IAW BMM 32-40-06.

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