This SAE Standard provides test procedures for air and air-over-hydraulic disc or drum brakes used for on-highway commercial vehicles over 4536 kg (10 000 lb) of GVWR. This recommended practice includes the pass/fail criteria of Standard No. 121.

Purpose

To provide an FMVSS121-based performance test and a wear and performance at increasing brake temperatures for disc and drum assemblies.

 

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