Piper Comanche PA-24 Service Manual page 384

6-88a. Hand Brake / Master Cylinder Control Cable Inspection. (See Figure 6-33.)
(PA-24, PA-24-250, S/N's 24-1 thru 24-2298, less 24-2175.)
The hand brake / master cylinder control cable idler bushing (P/N 80022-096) may wear and/or cause
the master cylinder control cable (P/N 21077-000) (6) to wear. Accordingly, each 100 hours or annually,
whichever comes first, inspect:
a. the idler bushing for condition and security. Especially look for excessive wear or jamming of the
bushing; and,
b. inspect the master cylinder control cable (P/N 21077-000) (6) where it passes under the idler
bushing for condition. Especially look for excessive wear and fraying of the cable.
Brake Master Cylinder.
6-89.
(PA-24-180, PA-24-250, Serial Nos. 24-1 to 24-2174 incl. and 24-2176 to 24-2298 incl.)
Removal of Brake Master Cylinder.
6-90.
a. Access to the brake cylinder is gained through a removable portion of the floorboard, located in
front of the pilot's seat.
b. Remove attaching screws and roll back the carpet from in front of the seat.
c. Remove the panel located to the left of the nose wheel housing by removing the attaching screws.
d. Disconnect the inlet supply line at the top of the cylinder and drain the fluid from the reservoir into
a suitable container.
e. Disconnect the pressure line at the bottom of the cylinder and allow the fluid to drain from the cylinder.
f. Disconnect the cylinder rod from the bellcrank by removing the cotter pin, washer, and pin.
g. Remove the master cylinder from its bracket by removing the attaching cotter pin, washer, and pin.
Disassembly, Cleaning, Inspection, and Repair of Brake Master Cylinder. (Refer to Figure 6-35.)
6-91.
a. Disassemble the master cylinder by removing the snap ring (3) at the top of the cylinder and
extracting the plunger assembly from the housing.
b. Remove the piston head (11), spring pin (13), and bushing (8) from the rod (7) by driving out the
roll pin (9).
c. Slide cap from piston rod.
d. Clean all parts in a suitable solvent.
e. Replace all worn parts.
Assembly of Brake Master Cylinder. (Refer to Figure 6-35.)
6-92.
a. Lubricate with hydraulic fluid and install the inner and outer "O" rings (4 and 6) on cap and slide
assembly on piston rod (7).
b. Slide the bushing (8) over the rod and the piston head (11) over the spring pin (13).
c. Install "O" ring (10) on end of piston rod.
d. Insert the spring pin (13) into the rod and secure with roll pin (9).
e. Install spring (14) on end of spring pin.
f. Slide the plunger assembly into the cylinder housing and secure with snap ring (3).
VI - LANDING GEAR AND BRAKE SYSTEM
PIPER COMANCHE SERVICE MANUAL
1K18
04/01/09