Rockwell Commander 112 - Page 141

SECTION VI
LANDING GEAR,
WHEELS AND BRAKES
MAINTENANCE MANUAL
ROCKWELL
COMMANDER
112/B/TC /TCA
NOI.
If transparent line is not kept
submerged in fluid in collector
pan, at all times, air will be
drawn into brake lines.
o. Remove transparent line from pilot master cyl-
inder and install filler cap.
p. Wrap master cylinder filler port cap with shop
towel
to prevent hydraulic fluid from squirting on
aircraft upholstery when pumping brakes.
q. Pump brakes until pressure builds up.
r. If brake is still soft, repeat steps a. through q. ,
until all air bubbles are removed from brake lines.
s. Remove shim installed in step c. 6.
t. Reinstall left (or right) brake on wheel.
u. Repeat steps a. through s., for bleeding right
brake lines.
Vo After both left and right brake lines have been
bled, remove drip pan and collector pan.
w.
Reinstall items removed in steps c. 1. and c. 2.
x. Functional test brake system.
y. Functional test landing gears by performing
a gear retraction test to assure brake lines in wheel
wells are clear of gear during operation.
:Mixed Bleed. MODEL 112 (Serial numbers 381 and
subsequent) and MODEL 112TC (Serial numbers thru
13149) .
a. Place drip pan under pilot's master cylinders
to protect aircraft interior, wipe off top of master
cylinders and remove left (or right) master cylinder
filler plug.
b.
Loosen cap on bleed tee in left (or right) wing
wheel well.
c. Remove
left brake (or right brake) assembly
from landing gear as follows:
6-22
NOI.
Do not disconnect hydraulic hoses
from brake assembly.
1. Disconnect clamp holding hydraulic hose
on landing gear yoke.
2. Remove
screws holding pressure plate
against brake disc.
3. Remove bolts holding brake housing and
remove brake assembly from wheel.
NOI.
Do not allow brake piston to fall out of
brake housing.
4. Reinstall pressure plate on brake housing.
5. Fabricate a 1 inch by 2 inch shim from
1/4 inch plate stock.
6. Insert fabricated shim in brake assembly
to prevent brake piston from falling out of brake
assembly when actuating brake.
7. Allow brake assembly to drop down, on flex
hose, so brake assembly bleed port is pointing
straight down.
d.
Connect a transparent line to brake assembly
bleed port.
e. Connect a· manual hydraulic pump to transparent
line and force bleed brake assembly up to bleed tee in
wing wheel well.
f.
After all air bubbles have been removed from
brake assembly and brake line up to bleed tee in wing
wheel well, retighten cap on tee.
g. Put parking brake control in OFF position.
h. USing manual hydraulic pump, still connected
to brake assembly, continue to force bleed brake line
up to bleed tee at firewall. Bleed tee (forward of co-
pilot's master cylinder) until air bubbles are removed.
i. Pull parking brake valve to ON pOSition captiva-
ting hydraulic fluid from brake assembly bleed port
to park brake valve.
j. Fill pilot's master cylinder reservoir. Use
caution to maintain reservoir "brim full" while
"pumping" master cylinder.
k. Loosen cap on firewall bleed tee and pump
master cylinder until there are no bubbles at tee.
1. Retighten cap on firewall bleed tee.
NOI.
Keep master cylinder reservoir full
at all times.
It may be necessary to actuate co-pilot
brake pedal to dislodge air bubbles.
m. When assured that all air bubbles are removed
from brake line, remove transparent line from brake
assembly and install cap on brake assembly bleed port.
n. Place parking brake control in OFF pOSition.
o. Wrap master cylinder filler port cap with shop
towel
to prevent hydraulic fluid from squirting on
aircraft upholstery when pumping brakes.
p. Pump brakes until pressure builds up.
q. If brake is still soft, repeat steps a. thru p.
until air bubbles are removed from brake lines.
r. Reinstall left (or right) brake on wheel.
s. Repeat steps a. thru r. for bleeding right
brake lines.
t. After both left and right brake lines have been
bled, remove drip pan.
u. Reinstall items removed from main gear.
v. Functional test brake system.
w. Functional test landing gear by performing
a gear retraction test to assure brake lines in wheel
wells clear gear during retraction and extension.
Brake Bleeding Procedure. MODEL 112B. MODEL
112TC (Serial numbers 13150 and Subsequent)
MODEL
112TCA.
a. Use a manual pump and MIL-H-5606 hydraulic
fluid.
b. Install return line for manual system to top of
hydraulic reservoir.
c • Install supply line to bleed tee at Wing Station
66.00 left side (see Figure 1-2 for station locations.
d. Parking brake - OFF.
e. Using manual pump, bleed brake system to
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