32-44-00
ALL ú ú 01 Page 6 ú Nov 12/01
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A 737-300/400/500MAINTENANCE MANUAL
V11 PARKING BRAKE VALVE (MAIN WHEEL WELL, AFT BULKHEAD)
Parking Brake Electrical Diagram Figure 3 (Sheet 1)
H26358
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32-44-00
ú ú 02 Page 7 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
V11 PARKING BRAKE VALVE (MAIN WHEEL WELL, AFT BULKHEAD)
Parking Brake Electrical Diagram Figure 3 (Sheet 2)
H26365
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32-44-00
ú ú 01 Page 8 ú Mar 15/98
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A
737-300/400/500MAINTENANCE MANUAL
PARKING BRAKE SYSTEM - TROUBLE SHOOTING
_______________________________________
1. General_______
A. You should do the trouble shooting procedure when the brake accumulator pressure decreases below the limit shown in the parking brake system test (AMM 32-44-00/501).
2. Do a Check on the System_________________________
A. References
(1)
AMM 12-15-11/301, Hydraulic Accumulator Servicing
(2)
AMM 32-41-00/201, Hydraulic Brake System - Maintenance Practices
(3)
AMM 32-41-00/501, Hydraulic Brake System - Adjustment/Test
B.
Procedure
(1)
Make sure that the hydraulic brake system is bled and operates correctly (AMM 32-41-00/201 and 32-41-00/501).
(2)
Make sure that the hydraulic accumulator is correctly filled (AMM 12-15-11/301).
(3)
Make sure that you put chocks on all the wheels.
3. Parking Brake System Trouble Shooting_____________________________________
A. References
(1)
AMM 29-15-00/201, Hydraulic System
B.
Procedure
(1)
Do the parking brake system accumulator bleed down test - parking brake set or parking brake released (AMM 32-44-00/501).
(2)
If the bleed down rate is too high, do the troubleshooting from the troubleshooting charts (Fig. 102 or 103).
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32-44-00
ALL ú ú 01 Page 101 ú Jul 12/00
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A
737-300/400/500
MAINTENANCE MANUAL
CHECK VALVES SEE A
RBL
30
INBD FWD WHEEL WELL OVERHEAD RBL 20 TO ACCUMULATOR
RBL 10
TO BRAKE METERING VALVES
CHECK VALVECHECK VALVE
TO AUTO BRAKE VALVE (REF)
SYSTEM B PRESSURE
ACCUMULATOR ISOLATION VALVE (REF)
SYSTEM A PRESSURE
A
Parking Brake Trouble Shooting - Check Valve Locations Figure 101
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32-44-00
ALL ú ú 02 Page 102 ú Mar 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
PRESSURE BLEED-DOWN PARKING BRAKE SYSTEM RATE IS TOO HIGH. BLEED-DOWN TEST WAITING LESS THAN 10 MINUTES AFTER TURNING ON PUMPS TO START PARKING BRAKE ACCUMULATOR TEMPERA-ALLOW 10 MINUTES FOR TURE TO STABILIZE.
LOW ACCUMULATOR PRE-CHARGE DO A CHECK ON THE PRE-CHARGE WITH BRAKE SYSTEM DEPRESSURIZED (AMM 12-15-11/301). SERVICE ACCUMULATOR (AMM 12-51-11/301)
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