Braking not Symmetrical during Normal Braking because of Failure of the Low Pressure-Control System

TASK 32-42-00-810-842-A
Braking not Symmetrical during Normal Braking because of Failure of the Low Pressure-Control System

1. Possible Causes

MASTER CYL-BRK CTL,L [2625GM]
MASTER CYL-BRK CTL,R [2626GM]
DUAL VALVE-ALTN BRK DISTR [2577GM]
hydraulic pipes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-43-00-612-001	Filling and Bleeding of the Low Pressure Control System of the Alternate Braking
AMM 32-43-00-710-001	Operational Check of Alternate Braking System
AMM 32-43-12-000-001	Removal of the Brake Control Master Cylinder
AMM 32-43-12-400-001	Installation of the Brake Control Master Cylinder
AMM 32-43-14-000-001	Removal of the Dual-Valve Alternate Brake-Distribution
AMM 32-43-14-400-001	Installation of the Dual-Valve Alternate Brake-Distribution

3. Fault Confirmation
Subtask 32-42-00-710-054-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of Alternate braking with/without anti skid AMM 32-43-00-710-001.
Do a check to confirm that when you put a same force on the left and right brake pedals, the left and right braking pressures do not increase symmetrically.

4. Fault Isolation
Subtask 32-42-00-810-099-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

do a check for leakage on:
. the master cylinders (2625GM) and (2626GM)
. the Alternate-brake distribution dual-valve (2577GM)
. the connections and hydraulic pipes between the master cylinder and the Alternate-brake distribution dual-valve.

(1) If there are leaks:

replace the defective component:
. the MASTER CYL-BRK CTL,L [2625GM] or MASTER CYL-BRK CTL,R [2626GM] AMM 32-43-12-000-001 AMM 32-43-12-400-001
. the DUAL VALVE-ALTN BRK DISTR [2577GM] AMM 32-43-14-000-001 AMM 32-43-14-400-001
. the hydraulic pipes .

(2) If there are no leaks:

bleed the low pressure-control system AMM 32-43-00-612-001.

[Rev.8 from Aug 2018] 2026.04.04 04:31:33 UTC