Brake Wear Check; Removal And Disassembly Of Brake System - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
7-76. BRAKE WEAR CHECK. (Refer to Figure 7-28.)
a.
Apply and release the brakes twice; then apply the parking brake.
b. Using the small hole in the snow shield (16), measure the distance from the inside surface of the
snow shield to the back of the pressure plate (8); note the dimension.
NOTE
A simple modification to the snow shield will simplify the wear
check. Refer to Figure 7-28 for modification details. Compliance
with this modification does not alter the FAA TSO conformance.
c.
Release the parking brake and rotate the wheel 120 degrees and recheck in accordance with step "b."
Perform this step again to obtain dimension from three different wheel positions; note the dimensions.
d.
When the dimensions obtained are 0.348 of an inch or more at any given check, remove the brake
assembly for overhaul.
7-77. REMOVAL AND DISASSEMBLY OF BRAKE SYSTEM. (Refer to Figure 7-27.)
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Remove the main wheel assembly in accordance with paragraph 7-70.
c.
Disconnect and cap the hydraulic brake line at the brake assembly and remove the six bolts securing
the brake assembly to the landing gear strut.
d.
Place the brake assembly with the housing down on a clean flat surface.
e.
Remove the six self-locking nuts (2), bolts (3), and countersunk washers (4) holding the assembly.
NOTE
Do not use impact or power wrenches to remove the brake bolts
or nuts.
f. Remove the back plate (5), rotating discs (6), stationary disc (7), pressure plate (8), torque tube (17),
and snow shield (16) from the brake housing sub-assembly (15).
g.
Remove the bleeder valve (12) from the bleeder adapter (13).
h. Remove the piston insulators (9) from the pistons (10).
i.
Remove the pistons (10) and O-ring packings (11) from the cylinder cavities in the housing
sub-assembly (15).
j.
Unscrew the bleeder adapter (13) from the housing sub-assembly (15) and remove the O-ring
packing (14), completing the disassembly.
Reissued: 9/23/80
LANDING GEAR AND BRAKE SYSTEM
2F22