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Brake cables
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Brake accumulator pressure gage
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Brake source light.
Brake Pedal Bus Mechanism
Most of the brake pedal bus mechanism components are below the flight deck floor. You get access to these components through the forward equipment center.
Brake Cables
Brake cables connect the brake pedal bus mechanism to the brake metering valves in the main landing gear wheel wells.
Brake Accumulator Pressure Gage and Brake Source Light
The brake accumulator pressure indicator and brake source light are on the P1 left forward panel.
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BRAKE HYDRO-MECHANICAL CONTROL -FLIGHT DECK COMPONENTS
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777 AIRCRAFT MAINTENANCE MANUAL
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BRAKE HYDRO-MECHANICAL CONTROL -MAIN LANDING GEAR WHEEL WELL COMPONENTS
Main Landing Gear Wheel Well Components
The hydro-mechanical control system includes these components in or near the left and right main landing gear wheel wells:
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Brake metering valves (2)
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Brake alternate source selector valve (ASSV)
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Brake accumulator isolation valve (AIV)
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Brake accumulator
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Brake accumulator servicing components
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Brake source pressure switch (2)
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Antiskid surge accumulator
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Antiskid surge accumulator servicing components.
Brake Metering Valves
The left and right brake metering valves are in the forward section of the main landing gear wheel wells.
Brake Alternate Source Selector Valve
The alternate source selector valve is in the left main landing gear wheel well inboard on the keel beam.
Brake Accumulator Isolation Valve
The accumulator isolation valve is in the right main landing gear wheel well inboard on the keel beam below the brake accumulator.
Brake Accumulator
The brake accumulator is on the keel beam in the right main landing gear wheel well.
Brake Accumulator Servicing Components
Brake accumulator servicing components are on the keel beam below and forward of the brake accumulator in the right main landing gear wheel well.
Brake Source Pressure Switch
There are two brake source pressure switches.
The normal brake hydraulic system pressure switch is in the right main landing gear wheel well on the keel beam inboard of the brake accumulator.
The alternate brake hydraulic system pressure switch is in the left main landing gear wheel well on the alternate source selector valve.
Antiskid Surge Accumulator
The antiskid surge accumulator is on the left main landing gear beam outboard of the landing gear trunnion.
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BRAKE HYDRO-MECHANICAL CONTROL -MAIN LANDING GEAR WHEEL WELL COMPONENTS
Antiskid Surge Accumulator Servicing Components
Antiskid surge accumulator servicing components are on the left main landing gear beam outboard of the antiskid surge accumulator.
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BRAKE HYDRO-MECHANICAL CONTROL -MAIN LANDING GEAR WHEEL WELL COMPONENTS
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BRAKE HYDRO-MECHANICAL CONTROL -BRAKE PEDAL BUS MECHANISM
Purpose
The brake pedal bus mechanism sends brake pedal inputs to manually control brake system pressure.
Components
These are the brake pedal bus mechanism components:
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Captain’s and first officer’s rudder pedals
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Vertical control rods (4)
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Lower bellcranks (4)
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Fore-aft control rods (4)
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Brake pedal bus crank assemblies (2)
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Cable quadrants (2)
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Transverse control rods (2)
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Brake cables (4).
Location
The rudder pedals are above the flight deck floor. The vertical control rods extend through the floor into the forward equipment center.
The brake cables attach to the brake pedal bus mechanism cable quadrants with a routing through the fuselage sides to the main landing gear wheel wells.
Functional Description
Two sets of brake pedals operate the brake pedal bus mechanism.
Pedal operation 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.
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