32-44-00
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 ú  03  Page 7
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (4)  
The pressure on the HYD BRAKE PRESS gauge can decrease quickly after you set the parking brake and remove the hydraulic power. This is because the antiskid surge accumulators fill with hydraulic fluid. This condition is satisfactory if the pressure does not decrease to less than 1700 psig.

 (5)  
With the parking brake set and the parking brake valve (V23) closed, the parking brake lever switch also powers the Parking Brake Closed Relay (R7514) to allow a PARKING BRAKE SET indication on EICAS, and the PARK BRAKE SET (L1539) light on the P37 panel to come on. The relay will also permit the flight deck voice recorder to be erased.

 (6)  
The parking brake lever returns to its original (off) position automatically when both brake pedals are fully depressed and then released. The return lever operates the parking brake lever switch to the off position. This cycles the parking brake module to the open position which permits the flow of hydraulic fluid through the normal antiskid modules to hydraulic system 4 return lines. This permits the antiskid system to function. Brake pressure is released through the brake metering valves.

 (7)  
The parking brake module cycles to the open position the Parking-Brake-Valve-Open Relay is energized. This suppresses the PARKING BRAKE VALVE and the ANTISKID OFF message on EICAS.

 B.
Control

 (1)  
Set the parking brake.

 (a)  
Make sure that hydraulic system No. 4 is pressurized (AMM 29-11-00/201).

 (b)  
Push both of the captain's or both of the first officer's brake pedals to the stops.

 (c)  
Pull the parking brake lever.

 (d)  
Release the brake pedals.

 (e)  
Keep hydraulic system No. 4 pressurized for 30 seconds minimum.

 NOTE: It is necessary to keep hydraulic system No. 4
____ pressurized for 30 seconds minimum for satisfactory parking brake system pressure. You can keep hydraulic system No. 4 pressurized more than 30 seconds to get more pressure.
 (f)  
Remove hydraulic system No. 4 pressure if it is not necessary (AMM 29-11-00/201).

 (2)  
Release the parking brake.

 (a)  
Push both of the captain's or both of the first officer's brake pedals to the stops.

 NOTE: This will cause the parking brake lever to return
____ to the off position automatically.
 (b)  Release the brake pedals.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 FAULT ISOLATION/MAINT MANUAL
PARKING BRAKE SYSTEM
COMPONENT  102 FIG. SHT  QTY ACCESS/AREA  REFERENCE 
BRAKES - (REF 32-41-00, FIG. 101) CABLES - (REF 32-41-00, FIG. 101) CHECK VALVE - (REF 32-41-00, FIG. 101) ACCUMULATOR - (REF 32-41-00, FIG. 101) HYDRAULIC BRAKE 
CIRCUIT BREAKERS - 2  FLT COMPT, P6 
BRAKE PRESS IND, C7  1  6D23  * 
HYD BRAKE PRESS, N120 DIRECT READING PRESSURE GAGE - (REF 32-41-00, FIG. 101) PARK BRAKE, C345 1  6L18  * 
LEVER - PARKING BRAKE 2  1  FLT COMPT, CONTROL STAND  32-44-01 
LIGHT - 4  NOSE GEAR, P37  * 
PARK BRAKE OFF (L1540)  1
PARK BRAKE ON (L1541)  1 
PARK BRAKE SET (L1539)  1 
LINKAGE - PARKING BRAKE  1  1  PEDALS FLT COMPT, FORWARD OF BRAKE  32-44-02 
LEVER - MANUAL OVERRIDE  3  1  RIGHT BODY GEAR WHEEL WELL 32-44-08 
PARK BRAKE VALVE OPEN, R732 PARK BRAKE VALVE CLOSED, R7514 RELAY - (REF 31-01-39, FIG. 101) BRAKE, CAPT AND F/O PEDALS - (REF 32-41-00, FIG. 101) MODULE - PARKING BRAKE  3  1  RIGHT BODY GEAR WHEEL WELL  * * 32-44-04 
　
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