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6.  Hydraulic Brake Accumulator
A.  Two hydraulic brake accumulators are mounted on the aft wall of the main wheel well. The hydraulic brake system is made up of two independent systems with separate pressure sources and requiring individual accumulators (Fig. 1). The air precharge is 1000 + 50 psi. A charging valve, a pressure gage and a pressure transmitter for each accumulator is mounted on the aft wall also.
B.  The brake accumulator stores energy for brake operation, dampens pressure fluctuations, and assures instantaneous flow of fluid to the brakes. When fully charged, the accumulator holds a reserve of fluid under pressure sufficient for approximately three brake applications and for maintaining parking brake pressure.
7.  Main Gear Brake Swivel Assemblies
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 (Fig. 6).
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8.  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 and brake hydraulic fuses (Fig. 7). 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 spring, brake pressure diverted to oppose metering valve piston and brake pressure acting on head ends of piston in brake valve feel augmentation actuator. 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. Energy for brake operation in event of normal hydraulic system failure is stored in the brake accumulators. The accumulators are precharged with compressed air or nitrogen and contain sufficient energy for approximately three full brake applications.
B.  When the automatic braking system is operating, the brake metering valves are bypassed and antiskid valves modulate brake pressure as required by the automatic braking system. Refer to 32-43-0 for automatic braking operation.

531  Main Gear Brake Swivel Assembly 
Oct 20/91  Figure 6  32-41-0 
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H80004
Hydraulic Brake System Schematic  591 
32-41-0  Figure 7  Aug 15/80 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

HYDRAULIC BRAKE SYSTEM - TROUBLE SHOOTING
1.  General
A.  The following precheck items should be performed before trouble shooting the hydraulic brake system:
(1)  
Perform brake system operation test (Ref Hydraulic Brake System - Adjustment/Test). If system malfunctions, see Hydraulic Brake System Trouble Shooting Chart.

(2)  
Provide System A and B hydraulic power (Ref 29-11-0, Hydraulic System A - Maintenance Practices and 29-12-0, Hydraulic System B - Maintenance Practices).

(3)  
Check that antiskid system is functioning normally (Ref 32-42-0).

(4)  
Check that automatic braking system is functioning normally (Ref 32-43-01).

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HYDRAULIC BRAKE SYSTEM - MAINTENANCE PRACTICES
1.  Bleed the Hydraulic Brake System
A.  General
(1)  
The brake hydraulic system must be bled when a hydraulic line of the brake system is opened or if a component connected to the system is replaced. When the system is bled, the air in the brake lines or a component of the brake system is transmitted to the reservoir by the return lines or released to the atmosphere.

(2)  
The quantity of time to bleed the system will be kept to a minimum if the brakes are filled and bled on the bench.
　
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