R A. If the test confirms the fault:

R (1) Do a check for leakage of the parking brake control valve (102GG):
R - on the Yellow brake-system relief-valve (3067GM) operate the manual
R depressurization pushbutton to release the accumulator pressure. on
R the Yellow hydraulic system, depressurize the hydraulic reservoir
R (Ref. AMM 29140061400100).
R - on the accumulator pressure gage (2585GM) make sure that nitrogen
R pressure is correct (Ref. AMM 32441120000100).
R - on the parking brake control valve at port C (service supply line),
R disconnect the hydraulic line.
R - install a plug at port C of the parking selector valve (102GG) and
R on the disconnected hydraulic line.
R - on the parking brake selector valve (102GG) at port B (return
R line), at the Tlevel, disconnect the hydraulic line between the
R parking brake control valve (102GG) and the T fitting.
R - install a plug on the T fitting.
R - on the Yellow hydraulic sytem, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988psi) and stop the pump.
R - put the parking brake control switch (73GG) in the ON position.
R - do a check for hydraulic leakage of the parking brake control valve
R (102GG).

R (a) If the leakage is more than 20 cm3/min during the first six
R minutes and more than 1 cm3/min after this time:
R - replace the CTL VALVE-PARK BRK, ELEC (102GG) (Ref. AMM TASK 32-R 45-51-000-001) (Ref. PM 32455140000100).

R (b) If leakage is in the permitted tolerances:
R - put the parking brake control switch (73GG) in the OFF
R position.
R - operate the manual depressurization pushbutton of the
R relief-valve (3067GM) to release the accumulator pressure.
R - remove the plug on the T fitting.
R - connect the line on the T fitting.

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R (2) On the Yellow hydraulic system, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988 psi) and stop the pump.
R - put the parking brake control switch (73GG) in the ON position.

R (3) If the fault continues:
R - put the parking brake control switch (73GG) in the OFF position.
R - operate the manual depressurization pushbutton of the relief-valve
R (3067GM) to release the accumulator pressure. on the Yellow
R hydraulic system, depressurize the hydraulic reservoir (Ref. AMM
R TASK 29-14-00-614-001).
R - replace the SEL VALVE-ALTN BRK (99GG) (Ref. AMM TASK 32-43-51-000-R 001) (Ref. AMM TASK 32-43-51-400-001).

R (4) On the Yellow hydraulic system, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988 psi) and stop the pump.
R - put the parking brake control switch (73GG) in the ON position.

R (5) If the fault continues:
R - put the parking brake control switch (73GG) in the OFF position.
R - operate the manual depressurization pushbutton of the relief-valve
R (3067GM) to release the accumulator pressure.
R - on the Yellow hydraulic system, depressurize the hydraulic
R reservoir (Ref. AMM TASK 29-14-00-614-001).
R - replace the BRAKE RELIEF VALVE (3067GM) (Ref. AMM TASK 32-44-15-R 000-001) (Ref. AMM TASK 32-44-15-400-001).

R (6) On the Yellow hydraulic system, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988 psi) and stop the pump. put
R the parking brake control switch (73GG) in the ON position.

R (7) If the fault continues:
R - put the parking brake control switch (73GG) in the OFF position.
R - operate the manual depressurization pushbutton of the relief-valve
R (3067GM) to release the accumulator pressure.
R - on the Yellow hydraulic system, depressurize the hydraulic
R reservoir (Ref. AMM TASK 29-14-00-614-001).
R - replace the MANIFOLD (3016GM) (Ref. AMM TASK 32-44-17-400-001)
R (Ref. AMM TASK 32-44-17-400-001).

R (8) On the Yellow hydraulic system, pressurize the hydraulic reservoir
R (Ref. AMM TASK 29-14-00-614-002).
R - use the Yellow electric pump to pressurize the Yellow brake
R accumulator (2582GM) to 206 bars (2988 psi) and stop the pump.
　
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