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is inhibited by the BSCU.
Normal braking and anti-skid regulation are
electrically controlled by the Braking and Steering
Control Unit.
OPERATION:
The selector valve is energized.
The automatic selector ensures the segregation of the
two hydraulic systems and preferential supply of the
normal braking system.
The throttle valve decreases the movement speed of the
automatic selector when the brake selector valve is
de-energized.
The normal brake servovalves supply a pressure which
depends on the control current delivered by the BSCU.
The manifold comprises the two servovalves, the two
pressure transducers and the two hydraulic fuses.
The hydraulic fuse stops the flow in the line in case
of leakage.
Note that during the normal braking the automatic
selector connects the alternate system to the yellow
return manifold.
During manual braking, the master cylinders provide
an artificial feel at the pedals.
The brake system is ready to be supplied by the
alternate system in case of normal braking failure.
TMULDGT05-T01 LEVEL 3
EFFECTIVITY 32-40-00 Page 2
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 164
ALL
BRAKE HYDRAULIC SYSTEM OPERATION - NORMAL BRAKING
TMULDGT05-P01 LEVEL 3
EFFECTIVITY 32-40-00 Page 3
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 165
ALL
WHEELS AND BRAKES - BRAKE HYDRAULIC SYSTEM OPERATION
ALTERNATE BRAKING WITH ANTI-SKID
The alternate braking with anti-skid associates yellow
high pressure with anti-skid regulation.
OPERATION:
The orders are entered through the pedals and an
auxiliary low pressure hydraulic system transmits the
orders via the master cylinders, to control the
distribution dual valve.
The pressure from the dual valve is delivered to the
brakes through the dual shuttle valve and the alternate
servovalves. It is indicated on the yellow pressure
triple indicator.
The alternate brake servovalve manifold comprises two
alternate servovalves and two hydraulic fuses.
The BSCU ensures the anti-skid regulation by
controlling the related servovalve.
The hydraulic fuse stops the flow in the line in case
of leakage.
TMULDGT05-T02 LEVEL 3
EFFECTIVITY 32-40-00 Page 4
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 166
ALL
BRAKE HYDRAULIC SYSTEM OPERATION - ALTERNATE BRAKING WITH ANTI-SKID
TMULDGT05-P02 LEVEL 3
EFFECTIVITY 32-40-00 Page 5
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 167
ALL
WHEELS AND BRAKES - BRAKE HYDRAULIC SYSTEM OPERATION
ALTERNATE BRAKING WITHOUT ANTI-SKID
In case of alternate braking without antiskid the
brakes are supplied either by the yellow high pressure
or the brake accumulator.
When yellow high pressure is available, the brakes are
supplied through the alternate system and the return
lines are connected to the yellow return manifold.
When the brakes are only supplied by the brake
accumulator the return lines are shut off by the
automatic selector.
OPERATION:
The orders are entered through the pedals only and an
auxiliary low pressure hydraulic system transmits the
orders via the master cylinders, to control the
distribution dual valve.
The pressure from the dual valve is delivered to the
brakes through the dual shuttle valve and the alternate
servovalves. It is indicated on the yellow pressure
triple indicator.
TMULDGT05-T03 LEVEL 3
EFFECTIVITY 32-40-00 Page 6
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 168
ALL
BRAKE HYDRAULIC SYSTEM OPERATION - ALTERNATE BRAKING WITHOUT ANTI-SKID
TMULDGT05-P03 LEVEL 3
EFFECTIVITY 32-40-00 Page 7
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 32 LANDING GEAR
UF94200
EFFECTIVITY Page 169
ALL
WHEELS AND BRAKES - BRAKE HYDRAULIC SYSTEM OPERATION
PARKING BRAKE
The brakes are supplied either by the yellow high
pressure manifold or the brake accumulator.
OPERATION:
When the parking brake handle is set to the "ON"
position, all the other braking modes and the anti-skid
　
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