THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 7
Jun 1/03
3G1
32-40-00
(d) Check brake disk for wear, grooves, scratches, or pits. Minimum disk thickness of disk
used on Wheel Assembly 40-120C is 0.405 (see Figure 1). A single groove or isolated
grooves up to .030 of an inch deep would not necessitate disk replacement. A grooving of
entire disk surface would reduce lining life and should be replaced. If necessary to remove
wheel disk, refer to Removal and Disassembly of Main Wheel.
(e) Check lining expansion groove. If groove is not showing replace linings. Remove linings by
prying loose with a screwdriver or a thin flat wedge. To install linings:
1 Position linings onto pins
2 Apply pressure to snap into position.
NOTE: After installation, condition new linings by performing two (2) consecutive full stop
braking applications from 30 to 35 kts. Do not allow brake discs to cool
substantially between stops.
(3) Assembly and Installation
(a) Lubricate piston O-ring(s) with fluid MIL-H-5606A and install on piston(s). Slide piston(s)
in cylinder housing until flush with surface of housing.
(b) Slide lining pressure plate onto anchor bolts of housing.
(c) Slide cylinder housing assembly on torque plate of gear.
(d) Position lining back plate between wheel and brake disc. Install bolts and torque to 40
inch -pounds to secure assembly.
(e) Connect brake line to brake cylinder housing.
(f) Bleed brake system as described in Bleeding Brakes.
C. Hand/Parking Brake Master Cylinder (See Figures 5 and 6.)
(1) Removal
(a) To remove brake master cylinder, first disconnect inlet supply line from fitting at top of
cylinder and allow fluid to drain from reservoir and line into a suitable container.
(b) Disconnect pressure line from fitting on cylinder and allow fluid to drain from cylinder line.
(c) Disconnect end of cylinder rod from brake handle by removing cotter pin that safeties
connecting clevis pin. Remove clevis pin and spacer washers.
(d) Disconnect base of cylinder from its mounting bracket by removing attaching bolt
assembly.
(e) Handle assembly may be removed by removing attaching bolt assembly that secures
handle to its mounting bracket.
(2) Disassembly
(a) Remove cylinder from its mounting bracket as per Removal of Brake Master Cylinder.
(b) To disassemble cylinder, first remove piston rod assembly by removing snap ring from
annular slot at rod end of cylinder. Draw piston rod assembly from cylinder.
(c) Piston rod assembly may be disassembled by first removing small snap ring securing
retainer bushing, spring, piston, seal, gland, and, if desired, large return spring.
(d) Remove o-rings from piston and gland.
(3) Cleaning, Inspection and Repair
(a) Clean cylinder parts with a suitable solvent and dry thoroughly.
(b) Inspect interior walls of cylinder for scratches, burrs, corrosion, etc.
(c) Inspect general condition of fitting threads of cylinder.
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