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EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-44-00-002
Purpose
The parking brake linkage mechanically locks the brake pedals
in the applied position.
These are the parking brake linkage components:
* Parking brake lever
* Parking brake switch
* Latch pawls (2)
* Return spring.
Location
The parking brake linkage is in the forward equipment
compartment below the captain brake pedals.
The parking brake switch is on the parking brake linkage.
Functional Description
When you push the brake pedals and pull the parking brake
lever up, these things occur:
* The brake pedals move the vertical control rods down
* The vertical control rods move the pawl stop down
* The parking brake lever moves the linkage and the bellcrank
* The bellcrank turns the latch pawl
* The latch pawl holds the pawl stop down when the brake
pedals are released
* The parking brake switch moves to the closed position
* You can then release the parking brake lever
* This keeps the captain and first officer brake pedals in the
applied position.
To release the parking brakes, momentarily push on the brake
pedals. This moves the pawl stop down and the return spring
turns the latch pawl. When you release the pedals, the pedals
move to the brakes off position.
PARKING BRAKE SYSTEM - LINKAGE
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-44-00-003
PARKING BRAKE SYSTEM - LINKAGE
PARKING BRAKE SYSTEM - LINKAGE
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-44-00-003
Purpose
The parking brake shutoff valve closes to prevent brake
accumulator pressure leakage through the normal antiskid
valve return.
Location
The parking brake shutoff valve is on the aft bulkhead of the
main landing gear wheel well.
Physical Description
The valve is a 28v dc motor-operated valve. It has a manual
override lever which shows the position of the valve and lets
you move the valve manually. The nameplate on the motor
shows the position of the manual override lever. The lever is in
the open position when the lever is near the POSITION 1 or
OPEN position on the nameplate. The lever is in the closed
position when the lever is near the POSITION 2 or CLOSED
position on the nameplate.
Functional Description
When the parking brake shutoff valve closes, it closes the return
lines from the normal antiskid valves. This prevents brake
system pressure loss caused by internal leakage in the normal
antiskid valves.
An internal position switch in the valve sends a valve position
signal to the parking brake close sense relay.
PARKING BRAKE SYSTEM - PARKING BRAKE SHUTOFF VALVE
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-44-00-004
PARKING BRAKE SYSTEM - PARKING BRAKE SHUTOFF VALVE
PARKING BRAKE SYSTEM - PARKING BRAKE SHUTOFF VALVE
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-44-00-004
General
When you set the parking brake lever, the parking brake switch
sends 28v dc power from the hot battery bus to close the
parking brake shutoff valve. Limit switches in the parking brake
shutoff valve remove power from the valve motor when the
valve reaches the commanded position. A position switch in the
valve sends valve position signals to the parking brake light and
the antiskid system.
Indication
When the parking brake shutoff valve moves from the open
position, the position switch in the parking brake shutoff valve
sends a ground to the parking brake light. This makes the
parking brake light come on.
You can push-to-test the parking brake light.
The parking brake switch sends lever set and lever not set
signals to the proximity switch electronics unit (PSEU). The
PSEU operates the takeoff warning system when the parking
brake is set during a takeoff. The PSEU sends a parking brake
　
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