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What Is the function of the Brake Control Valve?
Routes pressure to and from the brakes
How is the Brake Control Valve actuated?
By pressing on the pedals
What is the function of the Debooster?
Decrease system pressure to brakes and increases volume of fluid flow
How does the Debooster decrease system pressure?
Through different sized pistons
What does the Shuttle Valve do?
Moves back and forth providing system pressure in emergencies
The Shuttle Valve provides emergency pressure in only the ______
brakes
The pistons in Multiple Disc Brakes push out against
discs
Where is the Torque Tube located?
in the middle of the multiple disc brakes, everything surrounds it
What are stators?
A type of disc that is stationary
Where are stators keyed?
On the internal diameter to the torque tube
What is the function of a stator?
They rub up against the rotors to stop
What are rotors?
A type of disc that rotates
Where are rotors keyed?
On the outside diameter to the wheel
Do the keys on stators and rotors need to be checked for wear?
Yes
What are common defects of discs?
dishing / coning
When inspecting the brakes you should also check the
pad thickness
What is a slip?
When the tire has intermittently lost traction with the runway surface
What is a skid?
When the tire has lost all traction with the runway surface
What happens when your wheels are locked up?
Wheels stop spinning and is either skidding or hydroplaning
What is hydroplaning?
When the tire is gliding across water – no contact with runway surface
What is a Wheel Speed Sensor in an Anti-Skid System?
A sensor that sits in every axle
How does the wheel speed sensor work?
A flywheel is keyed to the wheel hub where it measures the wheel’s speed and sends the RPM to the control unit
What does the Control Unit do?
It monitors wheel speeds to make sure one isn’t decelerating more than the others
The control unit regulates pressure to prevent skids by sensing
the wheels gradually slowing down
How does the control unit provide locked wheel protection?
By determining all pressure goes to the locked wheel
How does the control unit provide touchdown protection?
By making sure the wheels aren’t locked on touchdown
What does the Antiskid control valve do?
It does the job that the control unit determines the system needs
Where is the antiskid control valve located?
between the brake valve and brake cylinder
What does the antiskid control valve control?
fluid
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