7-45. INSTALLATION OF BRAKE CYLINDER. (Refer to Figure 7-12.)
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 paragraph 7-46.
7-46. BLEEDING BRAKES.
7-47. BRAKE BLEEDING 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 f to the left main landing gear.
7-48. BRAKE BLEEDING 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 landing 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.
THIS SPACE INTENTIONALLY LEFT BLANK
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
LANDING GEAR AND BRAKE SYSTEM
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