Piper COMANCHE PA-24-180 Service Manual page 253

PIPER COMANCHE SERVICE MANUAL
6-81. Removal and Disassembly of Wheel Brake Assembly. (Cleveland) PA-24-180. PA-24-250. Serial
Nos. 24-3296 and up and PA-24-260 and PA-24-400 (Refer to Figure 6-29 )
a To remove the brake assembly, first disconnect the brake line from the brake cylinder and cap it
to prevent contamination.
b Remove the four cap bolts (I) that join the brake cylinder housing (3) and the lining back plate
assemblies (12) Remove the back plates from between the brake disc and wheel.
c. Slide the brake cylinder housing from the torque plate (13).
d. Slide the pressure plate (7) and lining (8) off the anchor bolts (14) of the cylinder housing.
e. The pistons (5) may be removed by injecting low air pressure in the cylinder fluid inlet and forcing
the pistons from the housings.
f The lining (8 and I ) can be removed by prying it from the pressure plate and back plates
6-82. Cleaning, Inspection And Repair Of Wheel Brake Assembly.
a. Clean the assembly with a suitable solvent and dry thoroughly
b.
Check the walls of the cylinder housing and pistons for scratches. burrs. corrosion. etc.. that may
damage "0" rings.
c. Check the general condition of the brake bleeder screw and lines.
d. Check the brake disc for grooves. scratches or pits. A single groove or isolated grooves up to 031
of an inch deep would not necessitate replacement. but a grooving of the entire surface would reduce lining
life and should be replaced Should it be necessary to remove the wheel disc, refer to Paragraph 6-87
e The old lining can be removed by prying it from the back plate and pressure plate and a new lining
snapped into place.
NOTE
Linings should be replaced when the thickness of any one segment is
3/32 inch or less. or the lining is worn uneven.
6-83 Assembly And Installation Of Wheel Brake Assembly. (Cleveland) PA-24-180. PA-24-250. Serial Nos.
24-3296 and up. PA-24-260 and PA-24-400 (Refer to Figure 6-29.)
a. Lubricate the piston "O" rings (4) with fluid M IL-H-5606 and install on piston (5). Slide the pistons
in cylinder housing (3) until flush with surface of housing.
b Slide the lining pressure plate (7) onto the anchor bolts (14) of the housing.
c. Slide the cylinder housing assembly on the torque plate ( 13) of the landing gear.
d Position the lining back plates (12) between the wheel and brake disc. Insert the spacer block (9)
between the back plates and cylinder housing, and install the four bolts ( I ) to secure the assembly and safety.
NOTE
Install a shim (10) between the spacer block and line backing plates
on PA-24-400 only.
REVISED: 4/10/81
3
LANDING GEAR AND BRAKE SYSTEM