Maintenance at the organizational level consists of removal and replacement of the master brake cylinder. Maintenance at the intermediate level consists of disassembly, cleaning, inspection, repair and replacement of seals and parts, lubrication, reassembly, and testing.

Before disassembly, the "Intermediate Repair" section of the MIM or 03 manual should be used to make sure that all parts, material, equipment, and facilities required during repair are available.

Before any removal, install an AN350-4 nut on the threaded end of the piston rod to bottom against the shaft bearing. This will eliminate the possibility of injury to personnel during disassembly because of spring preload.

Disassemble the cylinder according to the proce-dures provided in the "Intermediate Repair" section of the MIM and/or 03 manual. Place spring-loaded subassemblies in an arbor press or other device designed to restrain parts while relieving the tension.

Wash all reusable parts of the Gladden master brake cylinder with P-D-680 cleaning solvent. Use a bristle brush to remove caked dirt from exterior surfaces. Use a piece of soft, copper wire to remove obstructions from ports and passages. Thoroughly dry all parts with a clean, lint-free cloth or 20-psi compressed air.

Conduct the inspection of parts under a strong light and preferably with a means of magnification. Make the following checks:

1. Check all parts for nicks, cracks, scratches, and corrosion.

2. Check threaded parts for crossed or damaged threads.

3. Check all packing grooves for surface defects that might cut packings during installation or cause failure during operation.

4. Check the bearing on the suspension rod at the reservoir port end of the cylinder for freedom of rotation and evidence of nut spots.

5. Check all springs for specified load at given length. There should be no permanent set from test loading, and springs should not wobble when they are rolled across a hat surface.

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