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1. The problem could be a plugged or loose pilot orifice. The pilot orifice is a small pipe plug with a hole drilled through it, located behind the pilot port fitting on the brake valve. If it becomes plugged, it will prevent pilot pressure from the manifold, being available to open the brake valve. If it becomes loose, it will allow an unregulated amount of oil in to operate the brake valve which causes erratic brake valve operation.

   Remove the pilot hose and fitting from the brake valve, then use a wrench to remove the pilot orifice. Clean and install the pilot orifice tightly in the brake valve.

2. The friction brake may not be releasing as a result of a defective brake cylinder seal.
   
   
   1. Disconnect the swivel tee from the brake release port. Connect a hand pump with accurate 0-2000 psi ga
   
   Check brake cylinder seal as follows:uge and shut-off valve to the –4 J.I.C. fitting in the brake release port.
   
   
   1. Apply 1000 psi to the brake. Close shut-off valve and let stand for five (5) minutes. If there is any loss of pressure in five (5) minutes, the brake cylinder should be disassembled for inspection of the sealing surfaces and replacement of the seals. Refer to "Motor Support-Brake Cylinder Service" section of the service manual.
      
      NOTE: If the brake cylinder seal is defective you will usually find oil leaking from the winch vent plug.
   2. Friction brake will not release as a result of damaged brake discs.

      Disassemble brake to inspect brake discs. Check stack-up height as described in "Motor Support-Brake Cylinder Service" section of the service manual.