Residual Brake Pressure Indication on the Right or Left Brake Yellow Pressure Triple Indicator

TASK 32-44-00-810-809-A
Residual Brake Pressure Indication on the Right or Left Brake Yellow Pressure Triple Indicator

1. Possible Causes

IND-BRK YELLOW PRESS TRIPLE [60GG]
DUAL VALVE-ALTN BRK DISTR [2577GM]
PRESS XDCR-BRK,YELLOW L [63GG]
PRESS XDCR-BRK,YELLOW R [62GG]
MASTER CYL-BRK CTL,L [2625GM]
wiring from the pressure transducer (63GG) to the brake Yellow pressure triple indicator 60GG
MASTER CYL-BRK CTL,R [2626GM]
wiring from the pressure transducer (62GG) to the brake Yellow pressure triple indicator 60GG
MANIFOLD-ALTN BRK, L [2853GM]
MANIFOLD-ALTN BRK, R [2852GM]
PRESS XDCR-BRK, YELLOW L [101GG]
wiring
PRESS XDCR-BRK, YELLOW R [100GG]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 29-24-00-863-001	Pressurize the Yellow Hydraulic System with the Electric Pump
AMM 31-32-00-860-009	Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
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
AMM 32-43-32-000-001	Removal of the Alternate-Brake Manifold
AMM 32-43-32-400-001	Installation of the Alternate-Brake Manifold
ASM 324400
ASM 324401
AMM 32-44-18-000-001	Removal of the Pressure Transducers
AMM 32-44-18-400-001	Installation of the Pressure Transducers
AMM 32-44-19-000-001	Removal of the Pressure Transducer
AMM 32-44-19-400-001	Installation of the Pressure Transducer
AMM 32-44-21-000-001	Removal of the Brake Yellow Pressure Triple Indicator
AMM 32-44-21-400-001	Installation of the Brake Yellow Pressure Triple Indicator
TSM TASK 32-42-00-03	NORMAL BRAKING - TASK SUPPORTING DATA

3. Fault Confirmation
Subtask 32-44-00-860-053-A

A. Job Set-up
Make sure that the PARKING BRK control-switch is set to OFF before you do the procedure.

NOTE: On aircraft with EMM BSCS, with the aircraft on its wheels and if you have all these conditions:

Yellow hydraulic system not available (low pressure)
Parking brake set to OFF
Towing key not installed on the NLG electrical box 5GC
No other maintenance action is necessary.

The cause of the residual pressure is the activation of the Zero Torque Pressure (ZTP mode) by the ABCU.The ZTP mode is cancelled (the pressure goes back to zero) when one of the above conditions is cancelled.
If you do not have all of the above conditions, do the steps in Para.4.

Subtask 32-44-00-700-052-A

B. Test
Make sure that there is right or left pressure indication on the triple indicator without any action on the brake pedals.

4. Fault Isolation
Subtask 32-44-00-810-060-A ** ON A/C NOT FOR ALL

A. If there is right or left pressure indication on the triple indicator (60GG)

Disconnect the electrical connector from the related PRESS XDCR-BRK (62GG or 63GG). Monitor the pressure on the triple indicator.

(1) If the triple indicator continues to show the residual pressure:

replace the IND-BRK YELLOW PRESS TRIPLE [60GG] AMM 32-44-21-000-001 AMM 32-44-21-400-001.

(2) If the residual pressure shown on the triple indicator goes to zero:

install the pressure gage on the related Yellow brake bleeder to do a check for residual pressure on the brake.

(a) If there is residual pressure:

replace the DUAL VALVE-ALTN BRK DISTR [2577GM] AMM 32-43-14-000-001 and AMM 32-43-14-400-001.

(b) If there is no residual pressure:

replace the PRESS XDCR-BRK,YELLOW L [63GG] or the PRESS XDCR-BRK,YELLOW R [62GG] AMM 32-44-18-000-001 AMM 32-44-18-400-001.

replace the MASTER CYL-BRK CTL,L [2625GM] AMM 32-43-12-000-001 AMM 32-43-12-400-001

(d) If the fault continues:

do a check of the wiring from the pressure transducer (63GG) to the brake Yellow pressure triple indicator 60GG ASM 324401.

(e) If the fault continues on the right side:

replace the MASTER CYL-BRK CTL,R [2626GM] AMM 32-43-12-000-001 AMM 32-43-12-400-001.

(f) If the fault continues:

do a check of the wiring from the pressure transducer (62GG) to the brake Yellow pressure triple indicator 60GG ASM 324401.

Subtask 32-44-00-810-060-B ** ON A/C NOT FOR ALL

A. If there is right or left pressure indication on the triple indicator (60GG)

Disconnect the electrical connector from the related Yellow brake pressure transducer.
Monitor the pressure on the triple indicator.

(1) If the triple indicator continues to show the residual pressure:

replace the IND-BRK YELLOW PRESS TRIPLE [60GG] AMM 32-44-21-000-001 AMM 32-44-21-400-001.

(2) If the residual pressure shown on the triple indicator goes to zero:

install the pressure gage on the related Yellow brake bleeder to do a check for residual pressure on the brake.

(a) If there is residual pressure on the left side:

replace the MANIFOLD-ALTN BRK, L [2853GM] AMM 32-43-32-000-001 and AMM 32-43-32-400-001.

(b) If there is residual pressure on the right side:

replace the MANIFOLD-ALTN BRK, R [2852GM] AMM 32-43-32-000-001 AMM 32-43-32-400-001.

(3) If there is no residual pressure on the left side:
(a) Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
(b) Set the PARKING BRK control switch 73GG to ON.
(c) On the MCDU, get the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009.
(d) On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU CHAN/SYS 1(2) indication.
(e) On the BSCU CHAN/SYS 1(2) page, push the line key adjacent to the SPECIFIC DATA page 32-42-00-03 TSM TASK 32-42-00-03.
(f) On the BSCU CHAN/SYS 1(2)/SPECIFIC DATA page, push the line key adjacent to the SYSTEM DATA page.
(g) On the SYSTEM DATA page, push the line key adjacent to the REFRESH indication.
(h) Make sure that the pressure value (APTL) of the left Yellow brake pressure-transducer (101GG) is 145 +10 bar or -10 bar (2103.0467 +145.0377 psi or -145.0377 psi).
(i) If the pressure value (APTL) of the left Yellow brake pressure-transducer (101GG) is not 145 +10 bar or -10 bar (2103.0467 +145.0377 psi or -145.0377 psi):

replace the PRESS XDCR-BRK, YELLOW L [101GG] AMM 32-44-19-000-001 AMM 32-44-19-400-001.

(j) If the pressure value (APTL) of the left Yellow brake pressure-transducer (101GG) is in the tolerance:

do a check of the wiring from the left Yellow brake pressure-transducer (101GG) to the brake Yellow triple indicator (60GG) pin AD/AE to pin AF/AK ASM 324400.

(4) If there is no residual pressure on the right side:
(a) Pressurize the Yellow hydraulic system AMM 29-24-00-863-001.
(b) Set the PARKING BRK control switch 73GG to ON.
(c) On the MCDU, get the SYSTEM REPORT/TEST/L/G page AMM 31-32-00-860-009.
(d) On the SYSTEM REPORT/TEST/L/G page, push the line key adjacent to the BSCU CHAN/SYS 1(2) indication.
(e) On the BSCU CHAN/SYS 1(2) page, push the line key adjacent to the SPECIFIC DATA page.
(f) On the BSCU CHAN/SYS 1(2)/SPECIFIC DATA page, push the line key adjacent to the SYSTEM DATA page.
(g) On the SYSTEM DATA page, push the line key adjacent to the REFRESH indication.
(h) Make sure that the pressure value (APTR) of the right Yellow brake pressure-transducer (100GG) is 145 +10 bar or -10 bar (2103.0467 +145.0377 psi or -145.0377 psi).
(i) If the pressure value (APTR) of the right Yellow brake pressure-transducer (100GG) is not 145 +10 bar or -10 bar (2103.0467 +145.0377 psi or -145.0377 psi):

replace the PRESS XDCR-BRK, YELLOW R [100GG] AMM 32-44-19-000-001 AMM 32-44-19-400-001.

(j) If the pressure value (APTR) of the right Yellow brake pressure-transducer (100GG) is in the tolerance:

do a check of the wiring from the right Yellow brake pressure-transducer (100GG) to the brake Yellow triple indicator (60GG) pin AD/AE to pin AJ/AC ASM 324400.

[Rev.8 from Aug 2018] 2026.04.04 04:31:44 UTC