THRUSH AIRCRAFT, INC – MODEL S2R-G10
AIRCRAFT MAINTENANCE MANUAL
3-4
BRAKE SYSTEM BLEEDING
Ref. Fig. 3-3
If weak or “spongy” brakes are
experienced, it most likely means that air
has gotten into the hydraulic system for
that side. Air in the brake lines
compresses as the master cylinder is
actuated, allowing less pressure to get to
the brake cylinders.
To eliminate this air the brakes must be
bled, as follows:
1. Ensure that the master cylinder
reservoir is full. Leave the filler cap off.
2. Have available a clean container of at
least a pint capacity, a length of 3/16”
ID clear plastic tubing, clean rags and
extra MIL-H-5606 hydraulic fluid.
3. Put the clear plastic tubing on one of
the bleeder valves at the bottom of the
brake calipers and open the bleeder
valve with a wrench. Direct the
hydraulic fluid into a clean container.
4. Have a helper in the cockpit actuate the
brake pedals slowly through a number
of full strokes, ensuring that the master
cylinder reservoir does not run dry.
Refill the master cylinder reservoir as
necessary.
5. Have the helper continue to operate the
brake pedal until the stream of
hydraulic fluid coming out of the
bleeder valve is completely free of air
bubbles.
Figure 3-3: Hydraulic Brakes
Page Effective 03/26/2010
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