Piper Arrow IV Turbo Maintenance Manual page 405

BRAKE MASTER CYLINDER. (Hand Parking Brake)
REMOVAL OF BRAKE MASTER CYLINDER. (Refer to Figure 32-17.)
1. To remove the brake master cylinder, first disconnect the inlet supply line from the fitting at the top of
the cylinder and allow fluid to drain from the reservoir and line into a suitable container.
2. Disconnect the pressure line from the fitting at the bottom of the cylinder and allow fluid to drain from
the cylinder line.
3. Disconnect the end of the cylinder rod from the brake handle by removing the cotter pin that safeties
the connecting clevis pin. Remove the clevis pin and spacer washers.
4. Disconnect the base of the cylinder from its mounting bracket by removing the attachment bolt
assembly.
5. The handle assembly may be removed by removing the attachment bolt assembly that secures the
handle to its mounting bracket.
DISASSEMBLY OF BRAKE MASTER CYLINDER. (Refer to Figure 32-18.)
1. Remove the cylinder from its mounting bracket as per Removal of Brake Master Cylinder.
2. To disassemble the cylinder, first remove the piston rod assembly by removing the snap ring from the
annular slot at the rod end of the cylinder. Draw the piston rod assembly from the cylinder.
3. The piston rod assembly may be disassembled by first removing the small snap ring securing the
retainer bushing, spring, piston, seal, gland and, if desired, the large return spring.
4. Remove the O-rings from the piston and gland.
CLEANING, INSPECTION AND REPAIR OF BRAKE MASTER CYLINDER.
1. Clean the cylinder parts with a suitable solvent and dry thoroughly.
2. Inspect the interior walls of the cylinder for scratches, burrs, corrosion, etc.
3. Inspect the general condition of the fitting threads of the cylinder.
4. Check the piston and valve for scratches, burrs, corrosion, etc.
5. Repairs to the cylinder are limited to polishing out small scratches, burrs, etc. and replacing valve
washer seal and O-rings.
ASSEMBLY OF BRAKE MASTER CYLINDER. (Refer to Figure 32-18.)
Use a small amount of hydraulic fluid (MIL-H-5606) on the O-
ring and component parts to prevent damage and ease of
handling during reassembly.
1. Install new O-rings on the inside and outside of the packing gland and on the outside of the piston.
(When installing teflon O-ring on piston, it is recommended that it be installed with the use of a cone
placed against the piston. The cone may be constructed of plastic or metal with dimensions shown in Figure
32-18.)
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—NOTE—
2F6
32-40-15
Page 32-47
December 1, 1978