Loss of Alternate Braking on All the Brakes (Hydraulic Failure)

TASK 32-43-00-810-808-A
Loss of Alternate Braking on All the Brakes (Hydraulic Failure)

1. Possible Causes

hydraulic line
VALVE-PARK BRK OPERATED [2579GM]
AUTOMATIC SEL-BRK [2576GM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-42-13-000-001	Removal of the Automatic Selector
AMM 32-42-13-400-001	Installation of the Automatic Selector
AMM 32-43-00-710-001	Operational Check of Alternate Braking System
AMM 32-43-14-200-002	Drain Accumulated Water from the Brake Dual-Distribution Valve (BDDV)
AMM 32-45-14-000-001	Removal of the Parking Brake Valve 2579GM
AMM 32-45-14-400-001	Installation of the Parking Brake Valve 2579GM

3. Fault Confirmation
Subtask 32-43-00-710-053-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of Alternate braking with anti skid AMM 32-43-00-710-001.
(2) Make sure that there is no pressure on the two sides (RH & LH) of the triple indicator.

4. Fault Isolation
Subtask 32-43-00-810-057-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:
(1) Do a check for drain water on the alternate-brake distribution dual valve AMM 32-43-14-200-002.
(2) If the fault continues:

do a check for leaks on the:
. hydraulic line between the automatic selector (2576GM) and the parking-brake operated valve (2579GM)
. hydraulic line between the parking-brake operated valve (2579GM) and the alternate-brake distribution dual valve (2577GM).

(3) If there are leaks:

repair the related hydraulic line.

(4) If there are no leaks:

replace the VALVE-PARK BRK OPERATED [2579GM] AMM 32-45-14-000-001 and AMM 32-45-14-400-001.

(a) If the fault continues:

replace the AUTOMATIC SEL-BRK [2576GM] AMM 32-42-13-000-001 and AMM 32-42-13-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:31:40 UTC