Operator`s manual

OPERATION
328
The “121” Brake Standard
This manual refers occasionally to “121” brakes. Although some
operators believe “121” only applies to vehicles equipped with anti-lock
devices, the “121” standard applies to all vehicles that are capable of
on-highway operation.
The “121” is a Federal requirement also covering alterations or
changes to parts or systems related to the “121” standard once the
vehicle has been placed in service. The owner and operator should be
aware that it is a violation for any repair facility to make any part or
component inoperative when it is required for “121” compliance.
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