90-380001-25 - Marsh Brothers M-03-1000-3 - King Air Brake Master Cylinder Kit - OEM 90-380001-29 & 90-380001-33
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The 90-380001-25 is a specific part number of the series Marsh Brothers Aviation M-03-1000-3. For more generalized information on this item series or for more options, click here.
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| Alternate Models | |
|---|---|
| 90-380001-25 | OEM Part # |
| 90-380001-33 | OEM Part # |
| General Information | |
|---|---|
| Part # | 90-380001-25 |
| 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 | 300 - King Air , Beech 1900 , King Air |
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QUESTIONS & ANSWERS
The kit is compatible with OEM part numbers 90-380001-23, 90-380001-29, and 90-380001-33. These are specific to certain King Air and Beech 1900 brake master cylinders, so it’s important to verify your part number before installation.
Yes, the kit is approved by multiple aviation authorities: the FAA (SAO4634NY), Transport Canada (SA21-5), and ANAC Brazil (2024S08-04). These Supplemental Type Certificates (STCs) allow legal installation in U.S., Canadian, and Brazilian-registered aircraft.
Yes, the proprietary Thorseal® included in the kit replaces both the OEM O-ring and the rod wiper. This helps reduce leak points and simplifies the assembly while improving performance.
The piston rod seal is made from AeroLas™-Flex, a proprietary elastomeric polymer developed by Marsh Brothers. This material offers superior cold-weather flexibility and enhanced wear resistance compared to traditional rubber seals.
No, AeroLas™-Flex is not compatible with phosphate ester hydraulic fluids, such as Skydrol. Using this seal with Skydrol will cause degradation and failure, so it's important to verify your fluid type before installation.
No, the piston is not included in the Marsh Brothers King Air Brake Master Cylinder Kit. If the piston is damaged or worn, it must be sourced separately before completing the upgrade.
