TM 9-2320-269-10
UNDERSTANDING THE FMVSS 12(1) BRAKE SYSTEM (ANTILOCK) OPERATION
The following describes the basic operation of the air (service) brake system used to stop the M876 truck.
CAUTION
When performing before (B) preventive checks and services, if the yellow warning light does not go out
when the key switch is turned to ON position, do not operate the vehicle. Notify organizational
maintenance.
1.
Operation at instrument panel:
a.
When Ignition key switch (1) is turned to ON position (2) the bright yellow monitor warning light (3)
should flash on for one half second, followed by light (3) going out. This indicates the antilock system
b.
If the yellow monitor warning light (3) remains on, a problem is indicated in the antilock system. Do not
operate the vehicle. Notify organizational maintenance.
c.
Should the yellow monitor warning light (3) come ON while driving, do not become alarmed. The air
(service) brakes will continue to function as before but without the advantage of the antilock system.
Notify organizational maintenance as soon as you return to your base.
TA 222579
2-83