A
757 MAINTENANCE MANUAL
S 825-021
(8)
Adjust the brake metering valve linkage.
(a)
Manually rotate the input lever crank of the brake metering valves until the levers will not rotate any further and hold.
NOTE: This makes sure that the lever has turned the input
____ shaft till it has contacted the BRAKE OFF stop on the valve.
(b)
Install rig pins LGB3 and LGB4 through the metering valve quadrants and support structure (Details A and B, Fig. 503).
(c)
Adjust the metering valve control rods for length and install.
(d)
Remove rig pins LGB3 and LGB4.
S 825-022
(9)
Do a check of the parking brake adjustment (AMM 32-44-00/501).
S 825-023
(10)
Do a check of the Brake Pedal Stop Adjustment (Hydraulic Pressure Off).
(a)
Install a protractor on the Captain's brake/rudder pedal housing.
(b)
Push the brake pedals until they are at an angle of 18.5 to
19.5 degrees.
(c)
Make sure the Captain's brake pedal bellcranks touch the pedal stops (Fig. 502, Detail C).
(d)
If one or both of the brake pedal bellcranks do not touch the pedal stop(s), do the steps that follow: 1) Remove the stop(s) that do not touch the bellcrank. 2) Replace the shim with a new shim. Adjust the shim so that
the bellcrank touches the shim and stop combination when you push the brake pedals in 18.5 to 19.5 degrees. 3) Install the stop and shim with a bolt, nut and washer.
(e)
Install the access cover on the aft face of the Captain's and First Officer's brake/rudder pedal housing (Fig 502).
TASK 32-41-00-705-087
7. System Test - Hydraulic Brake System
____________________________________
A. General
(1)
This test gives a check of the hydraulic brake system and includes all system adjustment specifications and tolerances necessary to give the best system performance.
B.
Equipment
(1)
Pressure Gage - 0-4000 psig - one per brake
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C.
D.
E.
A
757
MAINTENANCE MANUAL
(2) Brake Pedal Measuring Equipment - J32001-39
NOTE: This equipmemnt can be used instead of the protractor
____ assembly and spring scale to measure brake pedal forces and brake pedal angles.
(3)
Spring Scale - 0-100 pounds - commercially available
(4)
Protractor, A27021-29 or 4MIT65B80307.1
(5)
Door Lock, Landing Gear - (AMM 32-00-15/201)References
(1)
AMM 06-41-00/201, Fuselage (Major Zones 100 and 200) Access Doors and Panels
(2)
AMM 12-12-01/301, Hydraulic Systems
(3)
AMM 12-15-04/301, Parking Brake Accumulator
(4)
AMM 24-22-00/201, Electrical Power - Control
(5)
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(6)
AMM 29-11-00/501, Main (Left, Right and Center) Hydraulic Systems
(7)
AMM 32-00-15/201, Landing Gear Door Locks
(8)
AMM 32-00-20/201, Landing Gear Downlocks
(9)
AMM 32-44-00/501, Parking Brake SystemAccess
(1)
Location Zones 211 Control Cabin, Left 212 Control Cabin, Right 731 Landing Gear Left 741 Landing Gear Right
Prepare for Test
S 495-078
(1) Make sure that landing the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
S 495-079
WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR
_______ LOCKS. DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
(3)
Put chocks on the landing gear wheels.
(4)
Install a 0-4000 psig pressure gage in each brake bleed fitting.
S 865-026
(5)
Move the landing gear control lever, on panel P3-1, to DN and attach a DO-NOT-OPERATE tag.
S 845-024
S 485-025
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