THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 13
Jun 1/03
3G7
32-40-00
(f) Pull hand brake handle, pumping master cylinder very slowly approximately 25 times until
fluid is observed passing through clear plastic hoses at wheel cylinder.
NO
TE: Maintained fluid level in reservoir to prevent air from entering line.
(g) Tighten both wheel bleeders.
(h) Pull hand brake until a firm handle is maintained.
(2) Pressure Procedure
(a) Place a small clear plastic hose on vent tube of brake reservoir and place a second small
clear plastic hose on bleeder fitting on one main landing gear. Place open ends of these
tubes in a suitable container to collect fluid overflow. Open bleeder fitting one or two turns.
(b) On other main gear, slide hose of pressure unit over bleeder fitting then open fitting one or
two turns and pressure fill brake system with MIL-H-5606A fluid.
(c) With fluid continually flowing through brake system, SLOWLY and together actuate hand
brake and toe brake pedal of side being bled, several times, to purge cylinders of air. On
dual brake installations, both right and left pedals must be actuated.
NO
TE: To determine if any air is left in system, watch fluid passing through the plastic
hose at fluid reservoir and bleeder fitting on gear being bled . If air bubbles are
evident, continue filling system until all air is out of system and a steady flow of
fluid is observed. If brake handle remains spongy, disconnect bottom of toe brake
cylinders (next to pedal) and rotate cylinder horizontally, or above horizontal, and,
by use of hand brake alone, purge air from system.
(d) Close open bleeder fitting on gear being bled. Close open bleeder fitting to which
pressure hose is attached; then close pressure unit and remove hoses from bleeder
fittings. Check brakes for proper pedal pressure. Replace caps over bleeder fittings.
NOTE: It may be necessary to remove any trapped air in top of wheel brake unit by
applying pressure to system with hand brake lever, slowly opening bleeder, and
releasing hand lever.
(e) Repeat this procedure, if necessary, on other gear.
(f) Drain excess fluid from reservoir to fluid level line with a syringe.
(3) After a Unit Has Been Changed
CAUTION: TO PREVENT AIR FROM ENTERING SYSTEM, DO NOT ALLOW PRESSURE
TO BLEED OFF BEFORE CLOSING BLEEDERS. REPEAT PUMPING AND
BLEEDING APPROXIMATELY 10 OR MORE TIMES OR UNTIL ALL AIR IS
RELEASED FROM SYSTEM. MAINTAINED RESERVOIR FLUID LEVEL
DURING ALL BLEEDING.
(a) Actuate hand brake handle until some pressure builds up in system. At this time, crack
attaching B nuts at any of hose connections of replaced unit. Most of handle sponge
feeling should be displaced by this action. Retighten B nuts.
(b) Actuate master cylinder and toe brake cylinder of side on which unit was changed. Bleed
fluid through brake assembly on wheel by pumping pressure and cracking bleeder until
pressure drops.
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