EFFECTIVITY:
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PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
B. BrakeAssemblies(continued)
and Disassembly -
3. Removal of Brake and Disc Carrier Assembly (referto 32-40-00 Figure404)
(a)
Place airplane on jacks (referto 7-10-00).
(b)
Removeappropriatewheel.
(c)
Ifonly removal or inspection of the lining and disc-carrier assemblyis required, proceed with thefollowing instruction; proceedtostep (d) for entire brake assembly removal.
(1.) Make sure all hydraulic pressureis off brakes.
(2.) Remove tenanchor bolts retaining pistonhousingassemblyin alignment with the brake torqueplate.Be careful not to let the disc-carrier and spacer platedrop out and be damaged.
Piston -Piston Tapped
HoleHousing\
ApplyMIL-T-5544Compound
To These Surfaces
ViewA ViewB Lubetorque Requirement CorrectPistonInstallation
NOTE: Forfurther Information on servicing B.F.G. Brake, refer to the manufacture's
service manual forthe 2-1435-2 brake.
B. F. Goodrich Brake Installation
Figure 404 (Sheet 1 of 2)
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32-40-00 PAGE
13
Jan 10/90
PIPER AIRCRAFT
PA-42720 (Advanced Trainer)
MAINTENANCEMANUAL
B. Brake Assemblies (continued)
Piston Housing
Carrier Liningand Max. Torque Button Assembly
B. F. Goodrich Brake Installation Figure 404 (Sheet 2 of 2)
3. Removal and Disassembly of Brake and Disc -Carrier Assembly (refer to 32-40-00 Figure 404) (continued)
(3.) Make sure the piston housing and hydraulic lines are not damaged. Remove six torque
bolts fastening the brake torque plate to the axle torque plate. (4.) Withdraw brake torque plate and disc-carrier from the axle. (5.) Inspect linings and disc-carrier for excessive wear, scoring, corrosion, warpage,and
cracks. If possible, corrosionmustbe removed byhand using a medium grit carbide or
wet/dry sandpaper.
CAUTION: BE SURE TO CLEAN OFF THE DISC-CARRIER AND ALL LINING AFTER WORKING ON THESE PARTS, PREVENTINGANY CHANGE OF SCORING AFTER REASSEMBLY.
(6.) Inspect grooved areas of the wheel accepting the brake disc-carrier. If any part of the casting is crackedor excessively corroded,replacethe wheel half.
WARNING: BE SURE TO RELEASE ALL AIR PRESSURE BEFORE DISMANTLING ANYWHEEL.
(7.) Any small nicks or gouges must be blended out with 400 grit carbide paper (wet/dry). Areas exhibiting light corrosion mustbe thoroughly cleaned and repainted with one coat of zinc chromate primer and one coat of aluminum paint.
polyurethane (8.) Inspect the torque plate/piston housinganchor bolts for cracks, corrosion, and thread damage. Replace if necessary.
EFFECTIVITY: 040-999
Jan 10/9032-40-00
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
B. BrakeAssemblies(continued)
3. Removal and Disassembly of Brake and Disc -Carrier Assembly (refer to 32-40-00 Figure 404) (continued)
(d) To remove entire brake assembly, proceedas follows:
(1.) Be sure no pressureexists in the brake system.Removeand cap the hydraulic brake lines. (2.) Removesixhigh shear torquebolts. Withdraw the brake assembly.
4. Assemblyand Installation of Brake and Disc -Carrier Assembly (refer to 32-40-00Figure 404)
(a) If piston housing, disc-carrier,spacerplate,and torque plate have beenassembled,proceedas follows:
(1.) Lay piston housing assembly on a clean, flat surface with the piston housing's open side
up.
(2.) Install carriers with linings on their pistons.
(3.) Lay disc-carrier assembly over and linings onto the piston housing.
(4.) With carriers and linings installedon torque plate,align spacer plate on piston housing
and install torque plate onto piston housingwith anchor bolts.
(5.) Lubetorque the anchor bolts to 350 -370 inch-pounds.
(b)
With the brake assembled, position piston housingtoward the inboard side of the gear with the openend up. Install brake assemblytorqueplate onto the axle torque plate using high shear torquebolts.Torqueto 170 ± 10 inch-pounds.
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