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functions:
* Normal brakes
* Alternate brakes
* Accumulator brakes.
The brake pedals control the normal and the alternate brake
systems.
Components
These are the hydraulic brake system components:
* Brake pedal bus mechanism
* Brake cables (4)
* Brake pressure indicator
* Brake metering valve assembly (2)
* Alternate brake selector valve
* Accumulator isolation valve
* Accumulator
* Accumulator servicing components
* Brake hydraulic fuses (6)
* Brake shuttle valves (4)
* Brake assembly (4)
* Brake system relief valve.
Normal Brakes
If hydraulic system B supplies pressure, the normal brake
system uses hydraulic system B pressure to operate the
brakes.
Alternate Brakes
The alternate brake system uses hydraulic system A pressure
to operate the brakes when hydraulic system B does not supply
pressure.
Accumulator Brakes
When the hydraulic systems A and B do not supply pressure,
the brake accumulator supplies pressure to the normal brake
system.
Gear Retract Brakes
During landing gear retraction, the alternate brake system gets
pressure to operate the brakes. This stops wheel rotation
before the landing gear retracts.
HYDRAULIC BRAKE SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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HYDRAULIC BRAKE SYSTEM - GENERAL DESCRIPTION
HYDRAULIC BRAKE SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Flight Compartment Components
The hydraulic brake system includes these components on or
near the flight compartment:
* Brake pedal bus mechanism
* Brake cables
* Hydraulic brake pressure indicator.
Brake Pedal Bus Mechanism
Most of the brake pedal bus mechanism components are below
the flight compartment floor. You get access to these
components from the forward equipment compartment.
Brake Cables
Brake cables connect the brake pedal bus mechanism to the
brake metering valves in the main landing gear wheel well. You
get access to these components from the forward equipment
compartment and below the flight compartment floor.
Hydraulic Brake Pressure Indicator
The hydraulic brake pressure indicator is on the P3 first officer
instrument panel.
HYDRAULIC BRAKE SYSTEM - COMPONENT LOCATION - 1
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
32-41-00-002
HYDRAULIC BRAKE SYSTEM - COMPONENT LOCATION - 1
HYDRAULIC BRAKE SYSTEM - COMPONENT LOCATION - 1
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-41-00-002
Purpose
The brake pedal mechanism sends brake pedal inputs to the
brake metering valves to manually control brake metered
pressure.
Components
These are the brake pedal mechanism components:
* Captain and first officer rudder pedals
* Vertical controls rods (4)
* Lower bellcranks (4)
* Fore-aft control rods (4)
* Brake pedal bus crank assemblies (2)
* Cable quadrants (2)
* Bus rods (2)
* Brake cables (4).
Location
The rudder pedals and vertical control rods are above the flight
compartment floor. The vertical control rods extend through the
floor into the forward equipment compartment. All of the other
components are in the forward equipment compartment.
The brake cables attach to the brake pedal mechanism cable
quadrants and go to the main landing gear wheel well.
Functional Description
Two sets of brake pedals operate the brake pedal bus
mechanism.
Pedal movement goes through vertical control rods to the lower
bellcranks. These bellcranks connect to brake pedal bus crank
assemblies and cable quadrants with fore-aft control rods.
Input to the left cable quadrant controls the left brakes with
brake cables on the left side of the airplane. The right cable
quadrant and cables are on the right side of the airplane and
operate the same as the left.
Transverse control rods connect the left and right brake pedal
　
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