Failure of the parking brake system to set or release
 1. Possible Causes
_______________
 - CTL VALVE-PARK BRK,ELEC. (72GG)

 - CTL SW-PARK BRK (73GG)

 - wiring from 73GG connectors to 72GG connectors

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 32-45-00-710-001 Operational Check of the Parking Brake System Using Individual Motors in Turn AMM 32-45-51-000-001 Removal of the Parking-Brake Electrical Control-Valve 72GG AMM 32-45-51-400-001 Installation of the Parking-Brake Electrical
 Control-Valve 72GG
 AMM 32-45-52-000-001 Removal of the Parking Brake Control Switch (73GG)
 AMM 32-45-52-400-001 Installation of the Parking Brake Control Switch

 (73GG)

 3. Fault Confirmation
__________________
 A. Test Do the operational test of the parking brake system: (Ref. AMM TASK 32-45-00-710-001).
 4. Fault Isolation
_______________
 A. If the test does not confirm the failure but the problem continues:
 - replace the valve CTL VALVE-PARK BRK,ELEC. (72GG).
 (1) If the test confirms the fault:

 - do a check for 28 VDC signal on both connectors of 72GG

 (2) If there is no 28 VDC signal

 - do a check and repair the wiring from 73GG connectors to 72GG connectors (Ref. ASM 32-45/01)

 (3) If there is 28 VDC signal

 - do a check for ground signal on both connectors of 72GG
 (a) If there is no ground signal
 - do a check and repair the wiring from 73GG connectors to 72GG connectors (Ref. ASM 32-45/01).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞32-45-00∞∞∞∞∞∞∞∞∞∞Page 223
 Aug 01/05 CES (b) If there is ground signal

 1_ If the fault continues:
 - replace the CTL SW-PARK BRK (73GG) (Ref. AMM TASK 32-45-52-
000-001) (Ref. AMM TASK 32-45-52-400-001)

 - replace the CTL VALVE-PARK BRK,ELEC. (72GG) (Ref. AMM TASK 32-45-51-000-001) (Ref. AMM TASK 32-45-51-400-001)
 B. Do the test given in Para. 3.A.

 TASK 32-45-00-810-807

 One thermal fuse on Parking Brake Control Valve is out.
 1. Possible Causes
_______________
 - CTL VALVE-PARK BRK,ELEC. (72GG)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  32-45-00-710-001 Operational Check of the Parking Brake System Using Individual Motors in Turn AMM 32-45-51-000-001 Removal of the Parking-Brake Electrical Control-Valve 72GG AMM 32-45-51-400-001 Installation of the Parking-Brake Electrical Control-Valve 72GG
 3. Fault Confirmation
__________________
 A. Test
 (1) On the parking-brake electrical control valve 72GG make sure that one thermal fuse is out (you can see the white tape through the transparent cover).
 4. Fault Isolation
_______________
 A. If one thermal fuse is out:
 (1) Remove the related transparent cover.

 (2) Reset the thermal fuse.

 (3) Install the related transparent cover.

 (4) Do the operational test of the parking brake system (Ref. AMM TASK 32-45-00-710-001).

 (a) If the fault continues:
 - replace the CTL VALVE-PARK BRK,ELEC. (72GG) (Ref. AMM TASK 32-45-51-000-001) (Ref. AMM TASK 32-45-51-400-001).

 TASK 32-45-00-810-808

 Desiccant cartridge color change to pink on Parking Brake Control Valve
 1. Possible Causes_______________
 2. Job Set-up Information______________________ Not Applicable
 3. Fault Confirmation__________________
 A. Test
 Not applicable

 4. Fault Isolation_______________
 A. No maintenance action is necessary

R **ON A/C 401-499,

R TASK 32-45-00-810-809 R Failure of the Park Brake Selector Valve 102GG (closed position) R 1. Possible Causes
_______________ R - CTL VALVE-PARK BRK, ELEC (102GG) R 2. Job Set-up Information
______________________
R A. Referenced Information
　
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