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 C.  AIRPLANES WITH DECOTA HYDRAULIC FUSES; The lever is not lockwired. If you hold the lever in the open position, the pressure on both sides of the fuse will equalize so the fuse can be reset. Also, this will allow the fluid to flow through to the brakes during brake bleeding. When the lever is released, it will return to the closed position.
WALKING BEAM
MAIN GEAR
ACTUATOR
MAIN GEAR BRAKE SWIVEL ASSEMBLY
SEE  A
TRUNNION LINK
SHOCK STRUT
A
Main Gear Brake Swivel Assembly
Figure 7

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A

737-300/400/500MAINTENANCE MANUAL
ANTISKID
VALVE

TO BRAKES
FUSES SHOWN) (PNEUDRAULIC FUSE SEE A  FUSES SHOWN) (PNEUDRAULIC BYPASS VALVE LEVER SEE A 
FUSE  LOCKWIRE  CLOSED POSITION LEVER IN 1  LEVER IN OPEN POSITION  CLOSED POSITION LEVER IN 2  OPEN POSITION LEVER IN 
FLOW  FLOW 
PNEUDRAULIC FUSE  DECOTO FUSE 
A 
2 1  Figure 8 Brake Hydraulic Fuses LEVER DOES NOT HAVE TO BE LOCKWIRED CLOSED LEVER HAS TO BE LOCKWIRED CLOSED 

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A 737-300/400/500MAINTENANCE MANUAL
 9.  Operation
_________
 A.  When the captain or first officer depresses the brake pedals, the brake metering valves are opened and hydraulic fluid is directed to the brakes through antiskid valves (Fig. 9). The intensity of pressure established in the brakes varies directly with the amount of pedal force maintained. Feel at the brake pedals depends on brake metering valve return springs, brake pressure diverted to oppose metering valve position, and feel augmentor feedback. Depressing left or right brake pedals gives independent left or right brake operation on the main landing gear. When pedal force is reduced, fluid in the brakes is released to the hydraulic system return. The normal brake system and autobrake system are pressurized by hydraulic system B. In the event that hydraulic system B is lost, the alternate brake select valve opens to apply hydraulic system A pressure to the alternate brake system, and the accumulator isolation valve closes to prevent the accumulator from discharging into the normal brake system. If both hydraulic system A and hydraulic system B are lost the accumulator isolation valve opens and provides accumulator pressure to the normal brake system. The accumulator is precharged with compressed air or nitrogen and contains sufficient fluid for approximately six full brake applications.
 B.  When the automatic braking system is operating, the brake metering valves are bypassed and autobrake control module modulates brake pressure as commanded by circuit cards in the antiskid control module. Refer to 32-43-01 for automatic braking operation.
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A 737-300/400/500MAINTENANCE MANUAL
SENSE LINEA SYSALT
PRESSUREP/S
SOURCE
ACCUM
ACCUM-
SELECT
ISOLATE
ULATOR
UP LINE VALVE
VALVE
PRESSURE SENSE LINE
B SYS
PRESSURE

A SYS RETURN
BRAKE FEEL METERINGALTERNATE AUGMENTORDUAL BRAKE BRAKE FEELVALVE RIGHT BRAKE
CABLES AUGMENTOR NORMAL
(TYP) NORMAL CONTROL METERING
METERING MECHANISM VALVE
VALVE
LEFT BRAKE
CONTROL
MECHANISM

AUTO BRAKE
ALTERNATE

CONTROL VALVE
METERING
VALVE

P/S P/S
AUTOBRAKE
SHUTTLE
VALVE
ALT
ALT
(2 PLACES)
ANTISKID VALVEANTISKID VALVE NORMAL NORMAL
NORMAL NORMAL ANTISKID ANTISKID
B SYS
ANTISKID ANTISKID
RETURN
　
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