-
the braking command to the four servovalves,

 -
the information below to the lighted pushbutton switches:
 the system is armed or the deceleration rate that you get

 -to the ECAM system: the deceleration rate that you select or the AUTOBRK disarm signal or the AUTO BRK FAULT signal if arming is not possible.
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 (3) Operation
 (a)
 LOW mode

 (b)
 MED mode

 1_ This mode is used at landing.
 2_ The selector valve is energized by the extension command of
 the ground spoilers.
 3_ Braking is applied when the ground-spoilers extension signals
 are present (speed of the main gear wheel > 80 kts).
 The braking has a delay of 4 seconds. It is then progressively
 applied.
 4_ The pressure supplied by the 4 servovalves gradually
 increases, t = 3 s approx.
 The programmed deceleration is reached progressively.
 5_ The control circuit sends identical commands to the 4
 servovalves.
 6_ The BSCU uses the deceleration from the ADIRs and limits or
 increases the braking order to make it reach the selected
 deceleration rate.

 1 This mode is used at landing.
_
 2 The selector valve is energized by the extension command of
_ the ground spoilers.
 3 Braking is applied when the ground-spoilers extension signals
_ are present (speed of the main gear wheel > 80 kts). The braking has two phases:
 -
phase 1: the MED limited deceleration is progressively applied without delay until the A/C attitude is less than 1 degree or T= 4 seconds. The pressure supplied by the 4 servovalves gradually increases, The programmed deceleration (2 m/square second) is reached progressively.

 -
phase 2: when the A/C attitude is less than 1 degree or T= 4 seconds, the MED deceleration is then progressively applied. The pressure supplied by the 4 servovalves gradually increases,

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 The programmed deceleration (3 m/square second) is reached
 progressively.
 4_ The control circuit sends identical commands to the 4
 servovalves.
 5_ The BSCU uses the deceleration from the ADIRs and limits or
 increases the braking order to make it reach the selected
 deceleration rate.

 (c) MAX mode
 1 This mode is selected before take-off in case of rejected
_ take-off (at least 2 out 3 spoilers must be out).
 2 The command for the ground spoiler extension controls:
_
 -
the energization of the selector valve,

 -
the immediate delivery of a maximum pressure to the four brakes (with antiskid protection).

 3 The programmed deceleration rate is such as the full pressure
_ is applied on the four brakes. A small differential braking is not permitted. The auto brake system is disengaged:
 -when you put the landing-gear control lever in the UP position
 - or when you push again the mode-selection pushbutton switch already selected. There is no AUTO BRK indication on the ECAM.
 The automatic braking is only re-initiated after the selection of a new deceleration rate. This occurs if the signal for the extension of the ground spoilers is still generated. The automatic braking is totally and immediately cut off as soon as a ground spoilers-retraction signal is applied (this signal possibly results from a go-around command). The braking is inhibited but the system stays armed. The automatic braking is re-initiated as soon as there is a new mode selection (LOW or MED mode).
 (d) In the MAX mode, the load required at the pedal to cut off the automatic braking is greater than that in the LO or MED mode (half travel). Travel of the two brake pedals: 7.5 degrees in LOW and MED. Travel of the one brake pedal: 10 degreess in LOW and MED. The pilot can disengage the AUTO BRAKE MAX mode when he depresses just one pedal
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 (4) Disengagement in the event of failure The system cannot be armed and is disengaged in the cases below:
 -arming is impossible when there is a Green low pressure or A/SKID failure (servovalve, pressure transducer, tachometer) or electrical supply failure.
 -disengagement when there is a loss of one the arming conditions.
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 301-399,
 E. Braking during Landing Gear Retraction
 (1)
　
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