688 Self-Aligning Series
Master Cylinder
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• Outlet Ports: 1/8" NPT
• Max Pressure = 1,000 psi
• For use with MIL-H-5606 Fluid
  • Spherical bearings at both upper and lower attachments
    allow the master cylinder to self-align which eliminates the side load on the piston shaft.

  • Ideal for brake pedal installations with
    non-parallel geometry.
Click on Part Number for
Dimensional Data
Our standard master cylinder has a piston bore of 5/8" and is recommended for most aircraft. For aircraft with oversized tires, poor brake pedal geometry, etc. you may wish to use a master cylinder with a piston diameter of 9/16" which produces 19% more brake fluid pressure.

Part Number
688-1 shown

Piston Stroke = 1.4"

Displacement of master cylinders with a piston bore of 5/8" is 0.429 cu-in.
Displacement of master cylinders with a piston bore of 9/16" is 0.348 cu-in.
Part No.
5/8" Bore
Part No.
9/16" Bore
Pin-to-Pin
Length
Upper
Attachment
Lower
Attachment
Weight Price
688-1 688-901 7.5" Rodend Spherical Bearing Inline 7.2 oz. $299.00
688-2 688-902 8.0" Rodend Spherical Bearing Inline 7.4 oz. $299.00
688-3 688-903 7.5" Rodend Shperical Bearing 90° Offset 7.2 oz. $299.00
688-4 688-904 8.0" Rodend Shperical Bearing 90° Offset 7.4 oz. $299.00