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Starduster
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BrakesMaster Cylinder
Replaced the plunger O-ring with MS28775-110, INTSE3 N432, MIL-P-25732. Replaced the dyna-seal with 800-001-6. Filler Plug 140-01900, vented 140-02000
Had trouble with leaking master cylinders. I ended up replacing the 90 elbow with a bulkhead connector and a new O-Ring. Calipers and O-Ring LeakingCleveland 93D
Probably once the master cylinders were tight they blew out the seals on the calipers because it started leaking. What I thought was going to be a pain turned out to be very simple. I removed the two bolts from the calipers and one half of the disk brake pad fell on the floor. The whole assembly slides off the landing gear. The plunger is removed with a shot of air from the air hose and the rest of the hydraulic fluid comes out. Take some iron wool and remove all the corrosion in the cylinder. Clean the unit and slip the new O-Ring over the plunger. The 0-Ring number was MS28775-224 ... PO 00036395 LN 2 When ready to re-install, fill the unit with hydraulic fluid and install on the landing gear. Bleeding the Brakes
What could be easier? They want $47 for a special tool in one of the catalogs I have. The oil can and plastic tube are a couple of bucks. |
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A couple of tiny seals will do wonders for spongy brakes. Cylinders
were off a 67-69 Cessna Skyhawk 10-21, 10-21a. 
I grabbed an oil can, filled it with hydraulic fluid, and attached a 12"
piece of clear plastic tubing on the end with a tie wrap. The inside diameter of the tubing
was just big enough to go over the bleed screw. Loosening the bleed screw
and attaching the plastic tubing over it was very easy. Then all I had to
do was pump the oil can and watch the top of the master cylinder until the fluid
ran out. 