B.  
The hydraulic brake disconnect assembly contains two halves. The outer half is connected to the hydraulic line, and the inner half is installed in the brake.

 TASK 32-41-17-004-001
 2.  Hydraulic Brake Disconnect - Removal (Fig. 401)____________________________________
 A.  References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 32-00-30/201, Landing Gear Door Locks

 (5)  
AIPC 32-41-17 Fig. 1

 B.  
Access

 (1)  
Location Zones
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH
 735 Wing Landing Gear, LH
 745 Wing Landing Gear, RH

 C.  
Prepare for the Removal

 S 494-002
 (1)  Make sure the landing gear ground locks are installed (AMM 09-11-00/201).
 S 494-003
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 494-020

 (3)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-17
 ALL  ú ú 01 Page 401 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 844-019
 (4)  
Make sure the wheel chocks are installed.

 S 844-021

 (5)  
Release the parking brake.

 S 864-005

 (6)  
Make sure hydraulic systems No. 1, 2, and 4 are not pressurized (AMM 29-11-00/201).

 S 034-028

 (7)
Do these steps to remove the hydraulic fluid from the accumulator:

 (a)  
Look at the pressure indication of the HYD BRAKE PRESS gage on the Captain's Main Instrument Panel, P1.

 (b)  
Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Do this cycle again 10 times. 1) Make sure the pressure indication of the HYD BRAKE PRESS

 gage decreases during manual brake operation.
 2)  After 10 cycles of the manual brake operation, make sure the HYD BRAKE PRESS gage does not continue to decrease in pressure.
 D.  Remove the Hydraulic Brake Disconnect
 S 024-007
 (1)  
Do these steps to remove the hydraulic brake disconnect:

 (a)  
Do these steps to disconnect the hydraulic line from the brake: 1) Do the steps that follow:

 a)  Push the barrel on the hose half toward the brake and turn clockwise to disengage the locking pin on the brake half from the slot on the hose half.
 b)  Pull the barrel on the hose half of the brake disconnect away from the brake until the threads of the two halves of the brake disconnect are engaged.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 05 Page 402 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE  A  SLOT 
LOCKING PIN  (ENGAGES LOCKING PIN) 

BARREL (PART OF BRAKE DISCONNECT)
BRAKE DISCONNECT (BRAKE HALF)
2
WASHER (4 LOCATIONS)
BOLT
BRAKE
(4 LOCATIONS) BRAKE DISCONNECT (HOSE HALF) BACKUP RING
O-RING
BACKUP RING
BRAKE DISCONNECT (BRAKE HALF)
DETENT PIN
1 BOLT (4 LOCATIONS)
WASHER
(4 LOCATIONS) BRAKE DISCONNECT (HOSE HALF)
HYDRAULIC LINE
A
1
AIRPLANES WITH THE DETENT PIN RELEASE TYPE BRAKE QUICK-DISCONNECT COUPLING
2
AIRPLANES WITH THE THREADED TYPE BRAKE QUICK-DISCONNECT COUPLING
Hydraulic Brake Disconnect Installation Figure 401
　
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