Pressure Peaks Shown on the Brake Yellow Pressure Indicator when the Brake Pedals are quickly Depressed

TASK 32-44-00-810-810-A
Pressure Peaks Shown on the Brake Yellow Pressure Indicator when the Brake Pedals are quickly Depressed

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 29-10-00-863-001	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-863-002	Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-23-00-864-001	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
AMM 32-43-00-870-002	Bleeding of the High Pressure Alternate Braking System

3. Fault Confirmation
Subtask 32-44-00-865-053-A ** ON A/C NOT FOR ALL

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/Y BRK/PRESS/IND	61GG	C10
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY	4GG	M36
121VU	HYDRAULIC/BRAKING AND STEERING/SYS2/CTL	3GG	M35
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/CTL	1GG	M34
121VU	HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY	2GG	M33

Subtask 32-44-00-860-054-A ** ON A/C NOT FOR ALL

B. Job Set-Up
(1) Energize the aircraft electrical circuits AMM 24-41-00-861-002.
(2) On the panel 110VU, make sure that the PARK BRK control switch 73GG is in the OFF position.
(3) On the panel 402VU, make sure that the A/SKID & NOSE WHEEL switch 5GG is in the ON position.
(4) Pressurize the Green hydraulic system AMM 29-10-00-863-001.
(5) Pressurize the Yellow hydraulic system AMM 29-10-00-863-002.

Subtask 32-44-00-710-063-A ** ON A/C NOT FOR ALL

C. Test
(1) Depress the brake pedals very quickly.
(2) Make sure that there are pressure peaks on the brake Yellow pressure indicator.

4. Fault Isolation
Subtask 32-44-00-810-061-A ** ON A/C NOT FOR ALL

A. If the pressure peaks shown on the brake Yellow pressure indicator are:
(1) Less than 2000 PSI.

no maintenance action is required.

(2) More than 2000 PSI.

bleed the alternate braking system AMM 32-43-00-870-002.

5. Close-up
Subtask 32-44-00-860-055-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Depressurize the aircraft hydraulic systems AMM 29-23-00-864-001.
(2) De-energize the aircraft electrical circuits AMM 24-41-00-862-002.

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