32-44-00
ALL ú ú 01 Page 1 ú Mar 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PARKING BRAKE
SHUTOFF VALVE
SEE B
PARKING BRAKE SEE A HANDLE
CAPTAIN'S BRAKE PEDALS
JACKSHAFT
VERTICAL AXLE PUSH ROD PARKING BRAKE LIGHT SWITCH
BELL CRANK
HORIZONTAL BELL CRANK TIE ROD LOCKSHAFT PARKING BRAKE PAWLS DUAL BRAKE CABLES PARKING BRAKE ADJUSTABLE STOP SEE C
HORIZONTAL QUADRANT HORIZONTAL BELL CRANK
A
Parking Brake System Figure 1 (Sheet 1)
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32-44-00
ALL ú ú 01 Page 2 ú Feb 25/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TO RETURN
AFT WHEEL
FILTER MODULE
WELL BULKHEAD
MANUAL OVERRIDE LEVER AND VALVE POSITION INDICATOR
PARKING BRAKE SHUTOFF VALVE
ELECTRICAL CONNECTION ANTISKID RETURN LINES
PARKING BRAKE SHUTOFF VALVE
B
FROM BRAKE PEDAL
(2 LOCATIONS)
PAWL HOLDING
PIN (2 LOCATIONS)
PARKING BRAKE
ACTUATOR ROD BRAKE PEDEL BELL CRANK (2 LOCATIONS)
LOCKSHAFT
PAWL (2 LOCATIONS)
FWD
C
Parking Brake System
Figure 1 (Sheet 2)
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32-44-00
ALL ú ú 01 Page 3 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PARKING BRAKE LEVER
FWD
Parking Brake System
Figure 1 (Sheet 3)
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32-44-00
ALL ú ú 01 Page 4 ú Feb 20/84
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A 737-300/400/500MAINTENANCE MANUAL
SENSE LINEA SYS ALT
PRESSURE P/S
SOURCE
ACCUM
ACCUM-
SELECT
ISOLATE
ULATOR
UP LINEVALVE
VALVE
PRESSURE SENSE LINE
B SYS
PRESSURE
A SYS RETURN
BRAKE FEELMETERINGALTERNATEAUGMENTORDUAL BRAKEBRAKE FEELVALVE RIGHT BRAKE
CABLESAUGMENTOR NORMALCONTROL
(TYP) NORMALMETERING
METERING MECHANISM VALVE
VALVE
LEFT BRAKE
CONTROL
MECHANISM
AUTO BRAKE
ALTERNATE
CONTROL VALVE
METERING
VALVE
P/S P/S
AUTOBRAKE
SHUTTLE
VALVE
ALT
ALT
(2 PLACES)
ANTISKIDVALVEANTISKIDVALVE NORMALNORMAL
NORMALNORMALANTISKIDANTISKID
B SYS
ANTISKIDANTISKIDVALVEVALVE VALVEVALVE
RETURN
FUSE FUSE FUSE PARKINGFUSEFUSEFUSE BRAKEVALVE
SHUTTLEVALVE(4 PLACES)
LEFT GEAR RIGHT GEAR
PRESSURE
BRAKE UNITS BRAKE UNITS
RELIEFVALVE
1
1 ON SOME AIRPLANES
Hydraulic Brake System Schematic
Figure 2
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32-44-00
ALL ú ú 01 Page 5 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E64024
A 737-300/400/500MAINTENANCE MANUAL
5. Operation (Fig. 3)
_________
A. The parking brakes are set by depressing the brake pedals and lifting the parking brake lever and then releasing the brake pedals. The parking brake lights will come on and remain on as long as battery power is on. To release the parking brakes, the brake pedals are depressed and released. Antiskid, 32-42-00 describes the use of the parking brake circuit to test air-ground sensor circuits related to antiskid operation.
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