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

 (b)  
Make sure the pressure on the gages at the brakes is
 3000 |100 psi.

 S 845-018
 (2)  
Push the brake pedals fully and release them.

 (a)  
Make sure the parking brake releases and the pawls are clear of the lockwire on the brake cable turnbuckle.

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

 S 845-019
 (3)  Set the parking brake and remove the pressure from hydraulic System B (AMM 29-15-00/201)
 NOTE: This step keeps the brake system pressurized with the
____
 accumulator.

 S 725-020
 (4)  Make sure the parking brake light on the captain's control stand comes on.
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 32-44-00
 ALL  ú ú 03 Page 503 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
PARKING BRAKE LEVER
SEE B
SEE A
A
PARKING BRAKE LEVER 
PUSHROD BELLCRANK  SEE  D 
PUSHROD  BRAKE PEDAL PUSHROD 
PIVOT BOLT 
JACKSHAFT NUT  JACKSHAFT MICROSWITCH PUSHROD  LOCKSHAFT 
FWD  RUDDER PEDAL RIGGING PIN B  BEARING HOUSING LEVER  SEE  C 
Parking Brake Linkage Adjustment Figure 501 (Sheet 1) 

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 32-44-00
 ALL  ú ú 01 Page 504 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Parking Brake Linkage Adjustment
Figure 501 (Sheet 2)

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 ALL  ú ú 02 Page 505 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 725-021
 (5)  Do a check of brake pressure at the end of any of the time periods that follow. If the necessary pressure drop for one time period is not within the limits, you can use the next time period:
 NOTE: It is permitted to read the brake pressures from the brake
____ pressure gage in the cockpit, the brake accumulator gage in the wheel well, or the brake pressure gages installed on the brakes.
 (a)  
After 10 minutes, the pressure drop should be less than 150 psi.

 (b)  
After 30 minutes, the pressure drop should be less than 500 psi.

 (c)  
After 1 hour, the pressure drop should be less than 700 psi.

 (d)  
After 8 hours, the pressure should be greater than the accumulator precharge pressure (approximately 1000 psi).

 S 785-035
 (6)  
If the brake accumulator pressure bleeds down faster than is allowed, do the Parking Brake Troubleshooting Procedure (AMM 32-44-00/101).

 S 715-036

 (7)  
The troubleshooting of the parking brake system can be delayed until the next convenient maintenance period if the conditions that follow are met:

 (a)  
With the parking brake set, the brake accumulator pressure drop must be less than 800 psi in the first 30 minutes.

 (b)  
The system passes the Accumulator Bleed Down Test - Parking Brake Released.

 F.
Accumulator Bleed Down Test - Parking Brake Released

 (1)  
Pressurize hydraulic System B (AMM 29-15-00/201)

 S 865-029
 NOTE: It is necessary to supply hydraulic power for at least
____ 10 minutes before the test starts to let the accumulator temperature stabilize.
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