(b) Increase the tension on the left and right brake cables to 210 +/- 10 pounds.
NOTE: When you are adjusting the cable tension, maintain a gap
____ of approximately 1.33 inches between the inboard edge of the lower lever arm of the brake pedal bus crank assembly and the outboard edge of the stop. Note that this is a preliminary gap adjustment and it is not necessary to adjust the gap accurately at this time. A stop gap gage block may make this adjustment easier.
(c)
Remove the rig pins No. 3 and No. 4 of the left and right brake metering valve control quadrant.
(d)
Push the left and right brake pedals to the stops 25 times.
S 035-036
(2)
Remove the lock clips for the turnbuckle on the brake cables (AMM 20-11-02/401) if they are installed.
(a)
Loosen the cable at the turnbuckles.
S 835-069
(3)
Do the steps that follow for the left and right brake metering valve assemblies to adjust the brake metering valve control rods (Fig. 502 sheet 2):
(a)
Disconnect one end of each of the four bus crank assembly pushrods and allow them to hang free.
(b)
Pull the cable quadrant in the direction that rotates the brake metering valve assembly input lever in the clockwise or off direction.
NOTE: Make sure that the brake metering valve assembly is in
____
the fully off position.
(c) If it is necessary, adjust the brake metering valve input control rod to the necessary length to install the rig pins No. 3 and No. 4 with a loose fit.
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MAINTENANCE MANUAL
RIGGING LOAD (POUNDS)
140
130
120
110
100
90
80
70
60
50
AMBIENT TEMPERATURE (`F)BRAKE CONTROL CABLE LOAD VS. TEMPERATURE
Brake Control Cable Tension Requirements Figure 501
U22943
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747-400 MAINTENANCE MANUAL
RIGHT BRAKE METERING VALVE
SEE D
LEFT BRAKE METERING VALVE
SEE B
BRAKE PEDAL LINKAGE
SEE A
FIRST OFFICER'S BRAKE PEDALS
CAPTAIN'S BRAKE BRAKE CABLES PEDALS
PUSHRODBRAKE CONTROL QUADRANT RIG PIN
NO. 2 BRAKE CONTROL
PUSHROD QUADRANT
LOWER LEVER ARM FOR
STOP
THE BRAKE PEDAL BUS
BRAKE PEDAL
BUS RODS
STOP
LOWER LEVER ARM FOR BELLCRANKTHE BRAKE PEDAL BUS BRAKE CONTROL QUADRANT PUSHROD
BRAKE PEDAL LINKAGE
BRAKE CONTROL A QUADRANT
Brake Control Linkage Figure 502 (Sheet 1)
PARKING BRAKE LEVER
PARKING BRAKE LINKAGE
BUS CRANK ASSEMBLY PUSH ROD (4)
RIG PIN HOLE RIG PIN NO. 1
BRAKE PEDAL BUS ASSEMBLY
SEE F
BRAKE
CABLES
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747-400
MAINTENANCE MANUAL
CONTROL QUADRANT CONTROL LEFT BRAKE
FOR THE LEFT BRAKE QUADRANT METERING VALVE
METERING VALVE CONTROL ROD
RIG PIN
LEFT BRAKE FWD INPUT
METERING VALVE LEVER
C
SEE C
CONTROL QUADRANT FOR THE RIGHT BRAKE LEFT BRAKE
METERING VALVE METERING VALVE
RIG PIN
LEFT BRAKE METERING VALVE B
RIGHT BRAKE
CONTROL
METERING VALVE
QUADRANT CONTROL ROD
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