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GAP BETWEEN PARKING PICK-UP BOLT IS TOO CONTROL BELLCRANK BRAKE PAWL AND BRAKE LARGE.  DO A CHECK ON THE PAWL ADJUSTMENT ON THE LOCKSHAFT.  REQUIREMENTS ADJUST PER 
NORMAL SYSTEM BRAKE PLUNGER GAP IS TOO METERING VALVE ROLLER/ LARGE (AMM 32-41-00/ 503).  MEASURE GAP  ADJUST GAP TO WITHIN LIMITS. 
EITHER OF 2 CHECK VALVES LEAKS INTER-NALLY (FIG. 101) OR ACCUMULATOR PRESSURE RELIEF VALVE (IF INSTALLED) (AMM 32-41-71/401).  PERFORM BRAKE ACCUMULATOR BLEED-___DOWN TEST WITH PARKING BRAKE NOT HIGH, ONE OF THE TWO CHECK VALVES SET. IF THE BLEED-DOWN RATE IS OR THE ACCUMULATOR PRESSURE RELIEF VALVE (IF INSTALLED) MAY BE LEAKING.  REPLACE BOTH CHECK VALVES OR ACCUMULATOR PRESSURE RELIEF VALVE (AMM 32-41-71/401). 
___ BRAKE SET (LEVER PARKING BRAKE SHUTOFF TION 2 WITH PARKING VALVE MANUAL OVERRIDE SHOULD BE IN POSI-TION 2). LEVER IS NOT IN POSI- MAKE SURE THAT THE PARKING BRAKE CHECK ON THE PARKING BRAKE SWITCH FLIGHT COMPARTMENT IS OFF, DO A IF THE PARKING BRAKE LIGHT IN THE LIGHT IN THE FLIGHT COMPARTMENT IS ON WITH THE PARKING BRAKE SET. ACTUATOR (AMM 32-44-00/501).  IF THE PARKING BRAKE OK, REPLACE THE PARK-IF THE ADJUSTMENT IS THE PARKING BRAKE LIGHT IS ON, REPLACE ING BRAKE SWITCH. SHUTOFF VALVE. 
INTERNAL LEAKAGE OF THE FOLLOWING VALVES: OFF VALVE PARKING BRAKE SHUT-NORMAL SYSTEM BRAKE (EITHER OF 2 VALVES) METERING VALVE VALVES) VALVE (EITHER OF 2 AUTO BRAKE SHUTTLE SYSTEM BRAKE NORMAL/ALTERNATE SHUTTLE VALVE (ANY OF 4 VALVES). . . . .  LINE TO THE ALTERNATE ANTISKID BRAKE SHUTTLE VALVES, BLOCK THE MODULE. FOR THE NORMAL/ALTERNATE LINE TO THE AUTOBRAKE CONTROL BRAKE SHUTTLE VALVES, BLOCK THE RETURN LINE BLOCKED. FOR THE AUTO BLEED-DOWN TEST WITH SUSPECT VALVE DO THE PARKING BRAKE SYSTEM CONTROL VALVE.  THE TEST, REPLACE THE IF THE SYSTEM PASSES SUSPECT VALVE. 

Parking Brake Accumulator System - Parking Brake Set - Troubleshooting Figure 102
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 32-44-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE  PROBABLE CAUSE  ISOLATION PROCEDURE  REMEDY 
BRAKE ACCUMULATOR SYSTEM PRESSURE BLEED-DOWN RATE IS TOO HIGH.  TURNING ON PUMPS TO 10 MINUTES AFTER WAITING LESS THAN START TEST  ALLOW 10 MINUTES WITH PUMPS RUNNING FOR ACCUMULATOR TEMPERA-TURES TO STABILIZE. 
INCORRECT ACCUMULATOR PRECHARGE  CHECK PRECHARGE WITH BRAKE SYSTEM DEPRESSURIZED.  (AMM 12-51-11/301) SERVICE ACCUMULATOR 
BRAKE ACCUMULATOR CHECK VALVE LEAKING (CHECK VALVE UPSTREAM OF ACCUMULATOR)  REPLACE CHECK VALVE. 
PRESSURE RELIEF VALVE LEAKING (FOR AIRPLANES EQUIPPED WITH THIS VALVE) BRAKE ACCUMULATOR  BLEED-DOWN TEST. PLUG RELIEF VALVE AND DO THE  REPLACE BRAKE ACCUMU-LATOR PRESSURE RELIEF VALVE (AMM 32-41-71/ 401). 
BRAKE METERING VALVE LEAKING INTERNALLY  PLUG A AND B SYSTEM PRESSURE INPUTS TO SUSPECT BRAKE METERING VALVE AND DO THE BLEED-DOWN TEST.  REPLACE BRAKE METERING VALVE (AMM 32-41-21/ 401). 

Parking Brake Accumulator System - Parking Brake Released - Troubleshooting Figure 103
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E86577
A
737-300/400/500MAINTENANCE MANUAL
 PARKING BRAKE SYSTEM - ADJUSTMENT/TEST
______________________________________
 TASK 32-44-00-825-001
 1. Parking Brake System Adjustment
_______________________________
 A. Standard Tools and Equipment
 (1)  
Chocks - Wheel

 (2)  
Rigging pins - 0.309/0.311 inch diameter by 6.8 inches long (one required)

 NOTE: These rigging pins are part of F70207-69 or F70207-78
____
 B. Access
 (1)  
Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right

 C.
Adjust the Parking Brake System (Fig. 501)

 S 495-002
 (1)
Install the chocks on the wheels and release the parking brake.

 S 825-003

 (2)  
Adjust the pawls on the lockshaft:

 (a)  
Extend the pawls one turn at a time until the parking brake can not be set.
　
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