3. Ensure that right toe brake pedals have been pulled full aft.
4. Pull hand brake handle and slowly pump master cylinder approximately 50 times or until hydraulic
fluid is observed passing through plastic tube at brake bleeder.
—CAUTION—
Fluid level in reservoir must be maintained to prevent air from
entering system.
5. Pump right brake cylinder very slowly approximately 12 times. This will purge air from toe brake
cylinder system. Watch for any air forced through clear plastic tube during this operation to ensure air
has been forced from toe brake system.
6. Pump hand brake an additional 25 times or until no air is observed through clear plastic tube.
7. Tighten brake bleeder and remove plastic tube.
8. Repeat steps 1 through 6 for left main landing gear.
BRAKE BLEEDING PROCEDURE (PRESSURE)
1. Place a clean, clear plastic tube on vent fitting on top of brake fluid reservoir. Extend free end of tube
to a container partially filled with hydraulic fluid (MIL-H-5606). Ensure that end of tube is submerged
in fluid.
2. Attach another clear plastic tube to brake bleeder of right landing gear. Connect free end of tube to
pressure source. Open bleeder 1 to 2 turns and pressure fill system with fluid.
3. With fluid continually flowing through the system, slowly and simultaneously actuate hand brake and
toe brake pedal, of side being bled, several times to purge cylinders of air. On dual brake installations,
both pedals for brake being bled must be actuated.
—NOTE—
By watching fluid pass through plastic hose at fluid reservoir and
bleeder fitting on gear being bled, it can be determined whether
any air is left in system. If air bubbles are evident, filling of
system must continue until all the air is out of system and a
steady flow of fluid is obtained. Should brake handle remain
s p o n g y, it may be necessary to disconnect the bottom of the toe
brake cylinders (next to pedal) and rotating cylinder horizontally
or even above horizontal and use hand brake alone to purge air
from the system.
4. Close bleeder fitting. Do not remove tube from fluid reservoir until both brakes have been bled. Check
brakes on side being bled for proper pedal pressure. Replace cap on bleeder fitting.
—NOTE—
It may be necessary to remove any trapped air in the top of wheel
brake unit by applying pressure to the system with brake
handlever and slowly opening bleeder and release hand lever.
5. Repeat steps 2 through @. for left main landing gear.
6. Drain excess fluid from reservoir to fluid level with a syringe.
32 - 46 - 00
Page - 32-30
Reissued: August 1, 1986
2C18
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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