Assembly And Installation Of Wheel Brake Assembly; Brake Master Cylinder; Disassembly Of Brake Master Cylinder - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
NOTE
Replacement brake lining should be conditioned by performing
three consecutive hard braking applications from 45 to 50 mph.
Do not allow the brake discs to cool substantially between stops.
This conditioning procedure will wear off any high spots and at
the same time generate sufficient heat to glaze the surface of the
linings. Once the linings are glazed, they will provide many hours
of maintenance free service.
7-52. ASSEMBLY AND INSTALLATION OF WHEEL BRAKE ASSEMBLY. (Refer to Figure 7-16 or
7-16b.)
a.
If anchor bolts have been removed, they should be reinstalled as follows:
1.
Support anchor bolt in a holding fixture. (Refer to Figure 7-16a, Step B.)
2. Align cylinder body over anchor bolt. (Refer to Figure 7-16a. Step C.)
3.
Using a suitable arbor press, apply pressure on the spot face directly over the anchor bolt.
(Refer to Figure 7-16a, Step D.)
4. Install washer and nut; torque nut to 60 inch-pounds.
b.
Lubricate O-rings with fluid MIL-H-5606 and install. Slide the pistons in cylinder housing until
flush with surface of the housing. Ascertain that the insulators (5) are cemented to the pistons.
c. Apply a small amount of thread lube to the threaded area of the inlet and outlet fittings and
install in cylinder.
d. Slide the pressure lining plate (6) onto the anchor bolts (16) of the housing.
e. Slide the housing assembly on the torque plate (1 1) of the gear.
f.
Install the backing plates (10) and secure with self-locking cap bolts (1); torque to 60
inch-pounds.
g. The wheel should rotate freely, if binding occurs, check axle nut to insure proper seating. If rubbing
occurs check back plate assembly and pressure plate assembly linings to be sure that linings are fully seated.
h. Connect the brake line to the housing and bleed brakes.
7-53. BRAKE MASTER CYLINDER.
7-54. REMOVAL OF BRAKE MASTER CYLINDER.
a. Disconnect the brake lines from the cylinder and place a protective cover over the line openings
to prevent contamination of the system.
b.
Remove the cylinder from the pedal assembly by removing the clevis pin at the piston rod and
the bolt at the top of the cylinder body.
7-55. DISASSEMBLY OF BRAKE MASTER CYLINDER. (Refer to Figure 7-17.)
a. The internal parts of the brake master cylinder (1) may be removed by removing the snap ring
(16) from the annular slot at the lower end of the cylinder. Pull the complete piston assembly from the
cylinder.
b. Slide the packing gland (15), "O" ring (13), washer (11), and spring (10) from the piston rod
(12).
c. The piston valve assembly may be removed by first removing the self-locking nut (2) from the
piston rod (12). This will allow the piston (8) with component parts to be removed.
Revised: 3/11/81
LANDING GEAR AND BRAKE SYSTEM
2G7