32-40-00 Page 32-76 Revised: December 6, 2002
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THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

32-40-00 Page 32-77 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

CLEANING, INSPECTION AND REPAIR OF PARKING BRAKE VALVE.
1.  
Clean the valve parts with a suitable solvent and dry thoroughly.

2.  
Inspect valve and seat surfaces of valve body for excessive wear and corrosion.

3.  
Inspect the cam assembly for burrs, scratches, excess wear, loose operating lever, etc.

4.  
Check general condition of valves and springs.

5.  
Repair to the valve is largely limited to smoothing burred or scratched surfaces and replacing O-rings.

ASSEMBLY OF PARKING BRAKE VALVE. (Refer to Figure 32-21.)
1.  
Install O-rings on valve cam.

2.  
Lubricate O-rings with fluid (MIL-H-5606), insert cam into valve body and secure with spring, bushing, washer and self-locking nut.

3.  
Install O-ring on the valve, insert valve in hole of out port, install valve spring and secure with outlet fitting.

INSTALLATION OF PARKING BRAKE VALVE.
1.  
Attach the valve to the bulkhead mounting bracket with screws.

2.  
Connect the fluid lines to the valve.

3.  
Connect the control cable to valve lever and determine that when valve lever fits in the closed detent, parking brake handle is .03 to .06 inch of being full in against stop.

32-40-00 Page 32-78 Revised: December 6, 2002
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THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

BRAKE MASTER CYLINDER. (TOE BRAKE)
REMOVAL OF BRAKE MASTER CYLINDER. (Refer to Figure 32-24.)

1.  
Disconnect the upper and lower lines from the cylinder to be removed and cap the lines to prevent fluid leakage or drain the fluid from the brake reservoir and master cylinder.

2.  
Remove cotter pins and clevis pins securing brake cylinder in position, then remove brake cylinder.

DISASSEMBLY OF BRAKE MASTER CYLINDER.
1.  Gar-Kenyon master cylinder number 17000. (Refer to Figure 32-22.)
A.  Remove the master cylinder from its mounting bracket.
B.  To disassemble the master cylinder, first remove the piston rod assembly by unscrewing the fitting from the master cylinder.
C.  The piston rod assembly may be disassembled by first removing the retaining ring securing the sleeve and then removing the spring, piston, seal, fitting, and, if desired, the large return spring.
D.  Remove the O-rings from the piston and fitting.
2.  Cleveland master cylinder number 10-30. (Refer to Figure 32-23.)
A.  Install new O-rings on the inside and outside of the packing gland and on the outside of the piston.
B.  To assemble the piston rod assembly, install on the rod, in order, the roll pin, washer, spring, washer, packing gland with O-rings, seal, piston assembly with O-ring, spring and roll pin.
C.  Insert the piston rod assembly in the master cylinder and secure with the retaining ring.
D.  Install the master cylinder.
CLEANING, INSPECTION AND REPAIR OF BRAKE MASTER CYLINDER.
1.  
Clean master cylinder components with a suitable solvent and dry thoroughly.

2.  
Inspect interior walls of master cylinder for scratches, burrs, corrosion, etc.

3.  
Inspect general condition of fitting threads.

4.  
Inspect piston for scratches, burrs, corrosion, etc.

5.  
Repairs to the master cylinder are limited to polishing out small scratches and burrs, and replacing seal and O-rings.

ASSEMBLY OF BRAKE MASTER CYLINDER. (Refer to Figures 32-22 and 32-23.)
— Note —
Rub a small amount of hydraulic fluid (MlL-H-5606) on all O-rings and component parts for ease of handling during reassembly and to prevent damage.
1.  Gar-Kenyon master cylinder number 17000. (Refer to Figure 32-22.)
A.  Install new O-rings on the inside and outside of the fitting and on the outside of the piston.
B.  To assemble the piston rod assembly, install on the rod, in order, the roll pin, return spring, retainer washer, return spring, fitting with O-rings, seal, piston with O-ring, spring and sleeve. Secure these pieces with the retaining ring on the end of the rod.
32-40-00 Page 32-79 Revised: December 6, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL

32-40-00 Page 32-80 Revised: December 6, 2002
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THE NEW PIPER AIRCRAFT, INC.
PA-44-180
　
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