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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 844-019
 (6)  Attach a DO-NOT-CLOSE tag and close the ANTISKID FAIL WARN & PARKING
 BRAKE circuit breaker on panel P6.
 S 874-020
 (7)  Push the brake pedals slowly and fully 6 times to bleed the system.
 NOTE:____ Stop a minimum of 5 seconds between each brake operation.

 S 844-021
 (8)  
Push the brake pedals, lift the parking brake handle, and release the pedals to set the parking brake.

 S 214-022

 (9)  
Make sure that the parking brake light on the captain's control stand comes on.

 S 724-023

 (10)
 Fully push the brake pedals fully and release them.

 S 214-024

 (11)
 Make sure the parking brake light is off.

 S 844-025

 (12)
 Set the parking brake.

 S 214-026

 (13)
 Do a check on the shutoff valve connections for leaks.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
OVERHEAD 
FLOW  FLOW 
FUSE  FUSE 
AUTOBRAKE 
CONTROL 
ANTISKID  ACCUMULATOR ISOLATION VALVE  MODULE  ALT BRAKE SELECTOR VALVE  ANTISKID 
SHUTTLE  BRAKE METERING  SHUTTLE 
RIGHT ALTERNATE  VALVES  VALVE ASSY (2 PLACES)  LEFT  VALVES  LEFT ALTERNATE ANTISKID CONTROL 
ANTISKID CONTROL  ANTISKID  VALVE 
VALVE  OUTBD CONTROL 
AUTOBRAKE  INBD  VALVES 
SHUTOFF VALVE PARKING BRAKE  FLOW BRAKE  SHUTTLE VALVES  FLOW BRAKE 
SEE  A  INBD  FUSES RIGHT ANTISKID  WHEEL WELL  FUSES 
OUTBD CONTROL VALVES  AFT BULKHEAD 
STA 727 
SERVICING GAGE 
ACCUMULATOR 
BRAKE PRESS 
TRANSMITTER 
BL 0 
VIEW LOOKING AFT 

STRUCTURE O-RING
REDUCER (REF) HYDRAULIC
LINE
MANUAL OVERRIDE LEVER AND VALVE POSITION INDICATOR
UNION
ATTACHMENT BOLTS (3 LOCATIONS) BRACKET
PARKING BRAKE SHUTOFF VALVE
ELECTRICAL
REDUCER CONNECTOR
O-RING UNION
A
Parking Brake Shutoff Valve Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
737-300/400/500MAINTENANCE MANUAL
 TIRES AND WHEELS - DESCRIPTION AND OPERATION
____________________________________________
General
_______
 A.  Each gear (nose and main) has two tire and wheel assemblies designed to withstand high rolling speeds. All wheels have provisions for attaching balance weights for dynamic balance. After takeoff, spinning of main gear wheels and nose gear wheels is stopped by main gear brakes and nose wheel snubbers respectively.
 B.  Each outboard main gear wheel and tire is covered with a fairing attached to the outboard main wheel hubcap. Each inboard wheel is provided with a small hubcap. The wheel and tire assemblies are designated Nos. 1, 2, 3 and 4, counting from the left looking forward.
Main Gear Wheel and Tire (Fig. 1)
________________________
 A.  The main gear wheel assembly is made of forged aluminum. To facilitate tire installation the assembly consists of two halves which are bolted together at 18 places around the wheel. The outside half contains a large bore pneumatic tire valve to service tubeless tires.
 B.  A pressure relief valve, which will rupture at 375 to 450 psi, is provided to protect against overinflation. Air loss between the wheel halves is prevented by a preformed packing located in an annular groove of the inside wheel half.
 C.  The wheel rotates on tapered roller bearings located in the end of the hubs. A molded rubber grease seal retains grease in the inside bearing area and keeps out dirt. The outside bearing area is protected by a cover assembly. Eight rotor drive keys on the inside circumference of the inside wheel half are used to key the wheel to the rotating elements of the brake. Heat shields consisting of thin steel plates mounted between the rotor drive keys protect the tire against excessive heat build up during braking. Four thermal fuses located on the inside wheel half will protect the tire against explosion due to excessive heat build up during abnormal braking conditions.
　
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