S 764-026
(4)
Supply electrical power (AMM 24-22-00/201).
S 844-005
(5)
Remove the pressure from hydraulic systems No. 1, 2 and 4
(AMM 29-11-00/201).
S 844-006
(6)
Do these steps to remove the hydraulic fluid from the brake
accumulator:
(a)
Look at the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1.
(b)
Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Do this cycle again 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS
gage decreases during the manual brake operation.
2) After 10 cycles of manual brake operation, make sure the HYD BRAKE PRESS gage does not continue to decrease in pressure.
E. Remove the Brake Pedal Bus Crank Assembly (Fig. 401)
S 014-007
(1)
Remove the fourth middle ceiling panels in the passenger compartment, forward of the No. 1 entry door (AMM 25-22-01/401).
S 024-008
(2)
Do these steps to remove the bus crank assembly:
(a)
Disconnect the control quadrant pushrod from the bus crank assembly.
(b)
Disconnect the horizontal pushrods from the bus crank assembly.
(c)
Disconnect the two bus rods from the forward side of the bus crank assembly.
(d)
Remove two screws from the lower end of the plastic strap, which is around the bus rods.
NOTE: Removal of the screws will make it easier to remove
____
the bus crank assembly.
(e) Disconnect the top mounting bracket from the structure.
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A
747-400
MAINTENANCE MANUAL
UPPER DECK FLOOR
BRAKE PEDAL
LINKAGE NO. 1 ENTRY DOOR
SEE A
UPPER MOUNTING
BRACKET
BUS
RODS HORIZONTAL BRAKE PEDAL
PUSHRODS BELL CRANK
ASSEMBLY
PLASTIC
STRAP
A
RIG PIN HOLE
STOP
BRAKE PEDAL BUS
CRANK ASSEMBLY
LOWER BEARING
INBD ASSEMBLY RETAINER
BRAKE CONTROL
QUADRANT PUSHROD
FWD
A
BRAKE PEDAL LINKAGE
A
Brake Pedal Bus Installation
Figure 401 (Sheet 1)
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A 747-400 MAINTENANCE MANUAL
UPPER MOUNTING
BRACKET
A-A
ASSEMBLY
Brake Pedal Bus Installation Figure 401 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
(f)
Remove the nut and washer from the bottom of the bus crank assembly.
(g)
Do the step that follows to lift the bus crank assembly out of the lower bearing retainer: 1) Turn the bottom of the bus crank assembly up and then pull
it forward.
(h)
Disconnect the top mounting bracket from the crank assembly.
(i)
Remove the bearing from the top mounting bracket. 1) Discard the bearing.
(j)
Disconnect the lower bearing retainer from the structure.
(k)
Remove the bearing from the lower bearing retainer. 1) Discard the bearing.
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