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linked to the brake metering valve and
to the corresponding pedal. Both pilot and
copilot foot forces are transmitted to the
brake metering valve by cables. For each
wheel, the pilot applying the greater force to
the corresponding pedal determines brake
Figure 14-13. PARKING BRAKE Knob
510OM-00 14-17
pressure to that wheel, and the position of the
corresponding pedal for the other pilot. The
pilot and copilot pedals move together.
Brake Metering Valve
The brake metering valve regulates left or
right brake pressure according to brake pedal
inputs as commanded by the crew.
Wheel Speed Transducers
One transducer is in each main gear axle. A
drive clip on the wheel hubcap spins the inner
rotor of the transducer. Wheel speed data is
provided directly to the antiskid control unit.
Antiskid Control Valve
To prevent skids, the antiskid control valve regulates
the distribution of brake pressure, as required
to prevent the skid. The antiskid control
valve is electrically controlled by the ASCU.
Antiskid Control Unit
A digital ASCU monitors wheel speed to provide
wheel skid protection and optimum braking
efficiency on all runway surfaces. Based
on wheel speed inputs, the control unit reduces
brake pressure as required to prevent the skid.
Parking Brake Valve
The parking brake valve is in the brake lines
between the antiskid control valve and the
brake assemblies. When a crewmember pulls
the PARKING BRAKE knob and depresses
the brake pedals, the valve engages check
valves to trap brake fluid pressure in the brake
lines. To relieve pressure due to fluid expansion
when the parking brake is engaged shortly
after heavy braking, 1,200-psi thermal relief
valves are in the parking brake valve.
CITATION MUSTANG OPERATING MANUAL
POWER BRAKE SYSTEM
SHUTTLE VALVE SHUTTLE VALVE
EMERGENCY
BRAKE VALVE
EMERGENCY BRAKE
NITROGEN BOTTLE
LEGEND
NITROGEN PRESSURE
METERED BRAKE FLUID
MECHANICAL
OVERBOARD
VENT LINE
Figure 14-14. Emergency Brake System
14-18 510OM-00
CITATION MUSTANG OPERATING MANUAL
Emergency Brake Valve
The emergency brake valve is lever operated
to provide metered pneumatic pressure from
the emergency nitrogen bottle directly to the
brake assemblies. The emergency brake valve
connects through a cable to the emergency
brake lever, which is under the instrument
panel near the right knee of the pilot.
Brakes and Shuttle Valves
Disc brakes are in each main gear assembly.
The brakes respond to hydraulic or pneumatic
pressure. Normally, fluid from the brake metering
valve hydraulically actuates the left and
right brakes separately as commanded by the
crew and/or the antiskid control unit. However,
a shuttle valve at each brake allows high-pressure
nitrogen from the emergency brake valve
to bypass hydraulic flow and apply pressure directly
to both brakes evenly.
CONTROLS AND INDICATIONS
ANTI SKID Switch
The ANTI SKID switch (see Figure 14-12) is
on the LANDING GEAR control panel and is
normally in the up (on) position. In the OFF
(down) position, the antiskid system deactivates;
brake operation remains the same except
that antiskid protection is not available.
Before turning the antiskid system off, ensure
that brake pressure is released. Before
turning the antiskid system on, ensure that
the wheels are not rotating.
Circuit Breakers
The power brake and antiskid systems receive
DC power from the left electrical bus.
The HYD PUMP circuit breaker is in the SYSTEM
section of the left CB panel. Disengaging
the HYD PUMP circuit breaker electrically
disables the hydraulic pump. This action reduces
or eliminates hydraulic system pressure.
This results in limited or improper functioning
of the power brake system or completely
eliminates the power brake system.
The SKID CONTROL circuit breaker is also
in the SYSTEM section of the left CB panel.
Disengaging the SKID CONTROL circuit
breaker disables the antiskid system and touchdown
protection.
CAS Messages
ANTISKID FAIL
If a fault develops in the antiskid system, the
amber ANTISKID FAIL message appears, and
the system must be deactivated (select ANTISKID
switch to OFF). When the message is visible,
leaving the antiskid system on can result
in unpredictable braking system performance.
The ANTISKID FAIL message indicates that
an internal test routine has failed or there are
electrical problems. Electrical problems may
　
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