Piper Cherokee LANCE, Service Manual

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PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
03/27/08 VI - LANDING GEAR AND BRAKE SYSTEM
(PA-32-260/300)
2B21
6-44. INSTALLATION OF BRAKE CYLINDER. (Refer to Figure 6-13.)
a. Position the cylinder (14) at its mounting points and attach with clevis pins. Safety the pins with
cotter pins.
b. Connect the brake lines to the cylinder fittings.
c. Bleed the brakes per Paragraph 6-45.
6-45. BLEEDING BRAKES.
6-46. BRAKE BLEEDING PROCEDURE (Gravity). (Refer to Figure 6-16.)
a. On both main landing gear wheel brake assemblies, attach a clear plastic hose to the brake bleeders
and extend into container partially filled with hydraulic fluid, MIL-PRF-5606. The ends of this hose
should be submerged in the fluid. Open both bleeders approximately one and one-half to two turns.
b. Fill the brake reservoir on the fire wall with hydraulic fluid, MIL-PRF-5606.
c. Disconnect the toe brake cylinders from the pedal connection by removing clevis pin, washer and
cotter pin.
d. Invert toe brake cylinder to aid in releasing trapped air in the top of the cylinder.
e. Check toe brake pedals in the cockpit to insure pedals are pulled full aft.
f. Pull the hand brake handle, pumping the master cylinder very slowly approximately 25 times until
fluid is observed passing through the clear plastic hoses at the wheel cylinder.
NOTE: Fluid level in the reservoir must be maintained to prevent air from entering in the line.
g. Tighten both wheel bleeders.
h. Pull hand brake until a firm handle is maintained.
6-47. BRAKE BLEEDING PROCEDURE (Pressure). (Refer to Figure 6-17.)
a. Place a small clear plastic hose on the vent tube of the brake reservoir and place a second small
clear plastic hose on the bleeder fitting on one main landing gear. Place the open ends of these tubes
in a suitable container to collect the fluid overflow. Open the bleeder fitting one or two turns.
b. On the other main gear, slide the hose of the pressure unit over the bleeder fitting then open the
fitting one or two turns and pressure fill the brake system with MIL-PRF-5606 fluid.
c. With fluid continually flowing through the brake system, SLOWLY and together actuate the hand
brake and the toe brake pedal of the side being bled, several times, to purge the cylinders of air. On
dual brake installations, both right and left pedals must be actuated.