# SDR 1SMA20260615001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 15, 2026
- Submitted: August 25, 2026
- Operation: Air carrier
- Aircraft: [N4599X](https://openairdocs.org/aircraft/N4599X), registered now
- Make and model: Piper PA-32-300
- Registry model: [Piper PA-32-300](https://openairdocs.org/model/piper-pa-32-300) (OpenAirDocs)
- Aircraft serial: 327640040
- Aircraft time: 11,503 hours
- Engine: Lyc IO540K1A5
- Engine time: 1,947 hours
- Propeller: Hartzl HCC3YR
- System (JASC): [3240 · Landing Gear Brake System](https://openairdocs.org/jasc/3240)
- Part: Brake
- Part number: 3083A
- Condition: Burned
- Location: Zone 700
- Stage of operation: TX
- How discovered: O
- Nature of condition: K, A
- Precautionary procedure: F
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/1SMA20260615001

## Discrepancy

DURING TAXI FOLLOWING CONSECUTIVE REJECTED TAKEOFFS, THE AIRCRAFT EXPERIENCED A LANDING GEAR BRAKE FIRE. INVESTIGATION REVEALED THAT THE HEAT GENERATED BY THE CONSECUTIVE ABORTS CAUSED THE CALIPER HYDRAULIC SEAL (P/N: MS28775-222 O-RING) TO MELT AND FAIL. THIS FAILURE ALLOWED HYDRAULIC FLUID TO LEAK DIRECTLY ONTO THE HOT BRAKE DISK. THE FLUID IGNITED UPON CONTACT, RESULTING IN A LOCALIZED FIRE, A LOSS OF LEFT BRAKE PRESSURE, AND THERMAL DAMAGE TO THE LANDING GEAR, WHEEL FAIRING, AND SURROUNDING WING STRUCTURE.

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