King Air Beech Brake Master Cylinder Upgrade/Repair Kit

M-03-1000


Category: King Air

Type: Kit



Marsh Brothers’ Brake Master Cylinder upgrade & repair kit is a proactive solution that will eliminate the risk of failure due to leaks at the piston rod seal. By eliminating typical O-ring failure modes, this upgrade kit will increase mean time between unscheduled maintenance events keeping your aircraft in the air longer, while reducing maintenance costs associated with your brake master cylinder. Like all Marsh Brothers products, our glands and seals are developed to last for the long haul.

Installation of the Marsh Brothers brake master piston rod seal offers the opportunity to practice preventative maintenance, by eliminating the risks associated with the typical failure modes of traditional O-rings used in dynamic seal applications.

The Marsh Brothers Aviation King Air brake master cylinder upgrade kit contains all of the hardware to repair/upgrade your King Air brake master cylinder. Additionally, the kit also includes tooling to aid in the re-assembly. The piston rod seal (Thorseal®) provided is a Marsh Brothers Aviation proprietary lip seal design and is manufactured from a proprietary elastomeric polymer. The Marsh Brothers Aviation Thorseal® replaces both the OEM O-ring and rod wiper. The kit also includes installation instructions, instructions for continuing airworthiness and an authorized release certificate.

Caution: Thorseal® is made from Marsh Brothers proprietary material known as AeroLas™-Flex. AeroLas™-Flex is not compatible with phosphate ester hydraulic fluid, commercially known as Skydrol. Exposure to phosphate ester hydraulic fluid contamination will damage the seals.


  • Applicable to OEM P/N 90-380001-( ) series brake master cylinder.
  • Piston Rod Lip Seal eliminates risk of typical failure modes associated with traditional O-rings used in dynamic applications.
  • The proprietary elastomeric polymer offers improved lower pressure sealing performance and overall cold weather performance.
  • Installation Tooling included - Seal compression ring, thread sleeve, and push tube.
  • Delivery documentation includes copies of all STC certificates and a Transport Canada Form One (authorized release certificate) to keep your logbook up-to-date.

King Air Beech 1900 Model 99

TCCA SA21-5

FAA  SAO4634NY

65-90  1900  99
65-A90  1900C 99A
C90  1900D  A99
C90A    A99A
E90    B99
F90    C99
C90GT    
H90    
100    

TCCA SA21-5

FAA  SAO4634NY

A100

B100

200

200C

200CT

200T

B200

B200C

B200CT

B200T

B200CGT

B200GT
300

300LW

B300

B300C





Brake Master Cylinder Kit Picture

Item#  MBA Part # Description Quantity OEM Cross Reference Part #
1 AN316-5R NUT ROD END JAM 1 AN316-5R
2 MS16625-1100 INTERNAL RETAINING RING 1 MS16625-1100
3 MBA-03-10000 PISTON ROD GLAND SEAL 1 A57G401 / AN6227B6
4 MS28775-117 O-RING (STATIC GLAND) 1 01-117
5 MS28775-210 O-RING (PISTON HEAD) 1 01-117
6 MS28774-019 BACK-UP RING (PISTON HEAD) 1 N/A
7 MS24665-132 COTTER PIN 1 AN380C2-2
8 MS16624-1037 EXTERNAL RETAINING RING 1 N/A

 

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