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OPERATION
321
W5001442
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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