# SDR DJFA2011017

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 29, 2011
- Submitted: May 2, 2011
- Operation: Air carrier
- Aircraft: N454LX
- Make and model: Beech 400A
- Registry model: [Beech 400A](https://openairdocs.org/model/hawker-beechcraft-400a) (OpenAirDocs)
- Aircraft serial: RK327
- Aircraft time: 7,303 hours, 6,138 cycles
- System (JASC): [3243 · Master Cylinder/Brake Valve](https://openairdocs.org/jasc/3243)
- Part: Master Cylinder
- Part number: 45AS38401012
- Part serial: 975
- Condition: Failed
- Location: Mlg Brakes
- Part time: 101 hours, 75 cycles
- Stage of operation: TX
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DJFA2011017

## Discrepancy

DURING TAXI, CREW REPORTED BRAKES SPONGY AND PEDALS SLOWLY LOSING PRESSURE.  MX FOUND THE RT BRAKE MIXING VALVE AND PILOT RT BRAKE MASTER CYLINDER FAILED.  BOTH COMPONENTS WERE REPLACED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.