Piper PA-28-161, Maintenance Manual

Page: 526 / 1104

PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 12
Nov 30/06
3E22
32-40-00
(5) Installation (Refer to Figure 6.)
(a) Position the cylinder 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 Bleeding Brakes, below.
E. Bleeding Brakes
(1) Procedure (Gravity)
(a) Attach a clean, clear plastic tube to the brake bleeder of the right landing gear. Extend
the free end of the tube to a container partially filled with hydraulic fluid (MIL-H-5606).
Determine that the end of the tube is submerged in the fluid. Open the bleeder 1/2 to 1
turn.
(b) Fill the brake fluid reservoir located on the firewall with hydraulic fluid.
(c) Check to determine the right hand toe brake pedal(s) in the cockpit have been pulled full
aft.
(d) Pull the hand brake handle and slowly pump the master cylinder approximately 50 times
or until hydraulic fluid is observed passing through the plastic tube at the brake bleeder.
NOTE: Fluid level in the reservoir must be maintained to prevent air from entering the
system.
(e) Pump right brake cylinder very slowly approximately 12 times. This will purge air from the
toe brake cylinder system. Watch for any air forced through the clear plastic tube during
this operation to insure air has been forced from the toe brake system.
(f) Pump the hand brake an additional 25 times or until no air is observed through the clear
plastic tube.
(g) Tighten brake bleeder and remove the plastic tube.
(h) Repeat steps a through g to the left main landing gear.
(2) Procedure (Pressure)
(a) Place a clean, clear plastic tube on the vent fitting on top of the brake fluid reservoir.
Extend the free end of the tube to a container partially filled with hydraulic fluid
(MIL-H-5606). Be certain the end of the tube is submerged in the fluid.
(b) Attach another clear plastic tube to the brake bleeder of the right landings gear. Connect
the free end of this tube to the pressure source. Open the bleeder 1 to 2 turns and
pressure fill the system with fluid.
(c) With fluid continually flowing through the system. SLOWLY and simultaneously actuate
the hand brake and toe brake pedal, of the side being bled, several times to purge the
cylinders of air. On dual brake installations, both pedals for the brake being bled must be
actuated.
NOTE: By watching the fluid pass through the plastic hose at the fluid reservoir and the
bleeder fitting on the gear being bled, it can be determined whether any air is left
in the system. If air bubbles are evident, filling of the system shall be continued
until all the air is out of the system and a steady flow of fluid is obtained. Should
the brake handle remain spongy, it may be necessary to disconnect the bottom of
the toe brake cylinders (next to the pedal) and rotating the cylinder horizontally or
even above horizontal and by use of the hand brake alone, purge the air from the
system.