(5)
Disconnect the electrical connector from the pressure switch.

 S 034-007

 (6)  
Disconnect the hydraulic lines from the selector valve and seal the lines with caps.

 S 024-008

 (7)  
Remove the unions from the ports of the valve, discard the O-rings and backup rings, and seal the ports with plugs.

 S 034-006
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-93
 ALL  ú ú 01 Page 401 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 024-009
 (8)  Remove the 3 bolts and remove the selector valve.
 TASK 32-41-93-404-040
 3. Install the Alternate Brake Selector Valve (Fig. 401)
__________________________________________
 A. Consumable Materials
 (1)  
D00007 Fluid - Hydraulic for testing, BMS 3-11

 (2)  
D00054 Lubricant - Hydraulic System Fittings, MCS 352

 B.
References

 (1)  
AMM 29-15-00/201, Hydraulic Systems

 C.
Access

 (1)  
Location Zone
 101 Left Control Cabin
 102 Right Control Cabin
 216 Left Main Wheel Well
 217 Right Main Wheel Well

 D.
Procedure

 S 164-011
 (1)  
Clean the selector valve and the mating surfaces of the mounting bracket.

 S 424-012

 (2)
Attach the selector valve to the mounting bracket with 3 bolts.

 S 644-013

 (3)  
Lightly apply hydraulic fluid or lubricant to the unions, the backup rings, and the O-rings.

 S 434-014

 (4)  
Install new O-rings and backup rings on the valve unions.

 S 424-015

 (5)  
Install the unions in the valve ports.

 S 434-016

 (6)  
Connect the hydraulic lines to the valve.

 S 434-017

 (7)  
Attach the electrical connector to the pressure switch on the valve and install the lockwire.

 (8)  
Supply electrical power (Ref 24-22-00/201).

 (9)  
Pressurize hydraulic system A and B (AMM 29-15-00/201).

 S 844-018
 S 844-019
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-93
 ALL  ú ú 01 Page 402 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 874-020
 (10) Push the brake pedals slowly and fully six times to bleed the system.
 NOTE: Stop a minimum of 5 seconds between each time you push the
____
 brake pedals.

 TASK 32-41-93-704-041
 4. Alternate Brake Selector Valve Test
_______________________________________
 A. References
 (1)  
AMM 24-22-00/201, External Electrical Power

 (2)  
AMM 29-15-00/201, Hydraulic Systems

 (3)  
AMM 32-00-01/201, Ground Locks

 B.
Access

 (1)  
Location Zone
 101 Left Control Cabin
 102 Right Control Cabin
 235 Left Main Wheel Well
 236 Right Main Wheel Well
 310 Left Main Landing Gear
 410 Right Main Landing Gear

 C.
Prepare for the Test for the Alternate Brake Selector Valve

 S 844-035
 (1)
Make sure that you install the ground locks (AMM 32-00-01/201).

 S 844-036

 (2)  
Put chocks on the main gear wheels and release the parking brakes.

 S 844-034

 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 844-037

 (4)  
Pressurize hydraulic system A and B (AMM 29-15-00/201).

 D.
Alternate Brake Selector Valve Operation Test (B Hydraulic System)

 (1)
Push the brake pedals many times to apply and release the brakes.

 S 724-023

 (2)  
Make sure that the brake stacks move to show that the brakes operate correctly.
　
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