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SAE J2521 (APR2013)

Historical Revision

Inertia Dynamometer Brake Squeal Noise Test Procedure for Vehicles without Regenerative Systems

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The SAE J2521 procedure is applicable to high frequency squeal noise occurrences for on-road passenger car and light trucks below 4,540 kg of GVWR. The procedure incorporates high temperature and low temperature test matrixes, but does not fully account for the effects of the environment on brake squeal. Much research is currently underway in this area and can potentially be incorporated in future revisions. For the purposes of this test procedure, squeal is defined as peak noise levels equal to or above 70 dB(A) between 1.25 kHz and 16 kHz for tests using a full suspension corners or full axle assemblies, or between 2 kHz and 16 kHz for brakes not using a full suspension corner. Before using this Recommended Practice for chassis dynamometer testing, review in detail the specifics related to at least (a) instrumentation including in-cabin microphones, (b) threshold levels for noise detection, (c) temperature control priority between front and rear axles, (d) vehicle loading and load distribution, (e) cooling air and environmental conditioning, and (f) detailed nomenclature and labeling of channels and sensors.

SDO SAE: SAE International
Document Number J2521
Publication Date April 11, 2013
Language en - English
Page Count 44
Revision Level 201304
Supercedes
Committee
Publish Date Document Id Type View
Oct. 7, 2022 J2521_202210 Revision
April 11, 2013 J2521_201304 Revision
Jan. 5, 2006 J2521_200601 Revision
June 3, 2003 J2521_200306 Revision
May 14, 2001 J2521_200105 Revision