Marsh Brothers Aviation M-03-1001-3 - Bonanza/Baron Brake Master Cylinder Kit - OEM 96-380034-23
Increase the operational reliability and performance of your aircraft's braking system with the Marsh Brothers Brake Master Cylinder Upgrade/Repair Kit. This FAA and TCCA-approved solution addresses a common issue with brake master cylinders – leaking piston rod seals caused by wear and tear on traditional O-rings.
Key Features
- Upgraded Piston Rod Seal: Marsh Brothers replaces the O-ring with a specially designed lip seal constructed from a high-performance polymer. This material offers superior wear resistance and sealing capabilities compared to the original equipment manufacturer (OEM) design.
- Enhanced Cold Weather Performance: The upgraded lip seal maintains greater flexibility at low temperatures, eliminating leaks that can occur with O-rings when the aircraft is parked in cold environments.
- Complete Rebuild Kit: The kit includes everything needed for a comprehensive master cylinder rebuild, including tooling, seals, a thread sleeve for protecting the inner lip during installation, a push tube (installation tool), a cotter pin, washers, static O-rings, and a circlip.
- Reduced Downtime: By proactively addressing potential leaks and wear, the Marsh Brothers Brake Master Cylinder Upgrade/Repair Kit helps minimize unscheduled maintenance occurrences, keeping your aircraft operational.
OEM Part #: M-03-1001-3
| Alternate Models | |
|---|---|
| M-03-1001-3 | OEM Part # |
| General Information | |
|---|---|
| Part # | M-03-1001-3 |
| Manufacturer | Marsh Brothers Aviation |
| Shipping Information | |
|---|---|
| Product Weight | 0.5 lbs. |
| Product Dimensions | 7 x 5 x 3 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Hawker Beechcraft | 56TC - Turbo Baron , 58 - Baron , 95-55 - Baron , 95-A55 - Baron , 95-B55 - Baron , 95-B55A - Baron , 95-C55 - Baron , 95-C55A - Baron , A56TC - Turbo Baron , Beech Baron , Beech Bonanza , C55 - Baron , D55 - Baron , D55A - Baron , E55 - Baron , E55A - Baron , Twin-Bonanza |
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QUESTIONS & ANSWERS
The kit is designed for brake master cylinders with OEM part numbers 96-380034-25 and 96-380034-23, manufactured by Commercial Aircraft Corp. It is not compatible with brake master cylinders made by Gerdes or Paramount, so it’s essential to confirm your master cylinder manufacturer before ordering.
The kit uses the AeroLas™-Flex piston rod lip seal, a proprietary Marsh Brothers design. This lip seal replaces both the traditional O-ring and rod wiper, offering improved performance, especially in cold weather and lower-pressure conditions.
No, AeroLas™-Flex is not compatible with phosphate ester-based hydraulic fluids, such as Skydrol. Exposure to these fluids can damage the seals, so it's important to ensure your system uses compatible fluid types before installation.
No, the piston is not included in the Marsh Brothers Brake Master Cylinder Kit. This kit is focused on upgrading the seals and related installation hardware. If a new piston is needed, it must be sourced separately.
Yes, the kit is approved by the FAA (SA04634NY), Transport Canada (SA21-5), and ANAC in Brazil (2024S08-04). This ensures it is authorized for use in registered aircraft in these jurisdictions, simplifying documentation and logbook entries.
Leaks can develop unexpectedly, and traditional O-rings degrade over time. Upgrading proactively with the Marsh Brothers kit helps eliminate common failure points, enhances system reliability, and reduces the risk of future maintenance issues—saving time and expense down the road.
