D.  
Two one-way check valves allow flow of system B hydraulic fluid into the accumulator but prevent the back flow of hydraulic pressure.

 E.  
An accumulator isolation valve is positioned with the check valves to block the flow of hydraulic fluid from the accumulator when system A pressure is applied to the alternate brake system. Low pressure in system A opens the accumulator isolation valve to allow accumulator pressure to the normal brake metering valves for use in an emergency (where System A and B are unpressurized) or for parking brake operation. System A pressure would operate the alternate brake system and close the accumulator isolation valve should system B fail (Fig. 6).

 F.  
A pressure relief valve is installed between the accumulator and the return line on the left outboard antiskid valve. This protects the system from pressure build up caused by the warming of a cold soaked accumulator during airplane descent. The valve opens when pressure in system exceeds 3500 psi and passes fluid to the hydraulic system B return lines until pressure drops back to 3500 psi or below.

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 ALL  ú ú 17 Page 9 ú Mar 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PRESSURE PORT  TORQUE TUBE BACKING PLATE LINING BLOCK 
ROTOR (4 PLACES) 
RELINE INDICATOR PIN (2 PLACES) SEE B  RIVET (TYPICAL) STATOR (5 PLACES) PISTON (6 PLACES) 
BLEEDER VALVES 
CARRIER  TORQUE TUBE 
PRESSURE CYLINDER (6 PLACES) 
MOUNTING FLANGE  PRESSURE PLATE 
AUTOMATIC ADJUSTER ASSEMBLY (4 PLACES) SEE A 
RECESSED WASHER  NUT  RETAINING RING 

ADJUSTER BALL  CARRIER  L 
SPRING  CARRIER 
RELINE INDICATOR PIN 
TUBE  ADJUSTER PIN PRESSURE PLATE  PRESSURE PLATE  RETAINING PIN RETAINER 
RIVET 
A  B 
Main Gear Brake - Bendix Figure 5 

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 ALL  ú ú 06 Page 10 ú Feb 25/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SYSTEM B
SYSTEM B AND

SYSTEM A ACCUMULATOR
VALVE POSITION FOR HYDRAULIC SYSTEM A AND B OPERATIONAL OR SYSTEM A AND B FAILURE

SYSTEM B AND
SYSTEM A
ACCUMULATOR
VALVE POSITION FOR HYDRAULIC SYSTEM B FAILURE
Accumulator Isolation Valve
Figure 6

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 ALL  ú ú 01 Page 11 ú Jul 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 7.  Main Gear Brake Swivel Assemblies (Fig. 7)_________________________________
 A.  The hydraulic brake lines mounted on the structure and on the landing gear of the airplane are connected by main gear brake swivel assemblies. The swivel assemblies permit continued flow in the hydraulic lines during retraction or extension of the landing gear. Swivel assemblies are mounted on the trunnion link of each gear.
 B.  The swivel assembly consists of two main parts. One is the rotating part or housing mounted on the trunnion link and the other is the stationary part or body. There is an individual swivel for each brake line.
 8.  Brake Hydraulic Fuses (Fig. 8)_____________________
 A.  A volumetic hydraulic fuse is located on the output line of each antiskid valve. The purpose of the fuse is to prevent loss of hydraulic fluid in event of a line rupture downstream of the fuse. The fuse will shut off flow after 40 cubic inches of fluid has passed through.
 B.  The fuse contains a bypass valve with a release lever which is lockwired in the closed position. Releasing the lockwire and holding the lever in the open position will equalize pressure on both sides of the fuse so that it can reset. It will also allow fluid to flow through to the brakes without setting the fuse during brake bleeding.
　
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