Browse Standards J2521_201304
Current Revised 2013-04-11

Disc and Drum Brake Dynamometer Squeal Noise Test Procedure J2521_201304

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.
J2521_201304
2013-04-11
Latest
Revised
J2521_200601
2006-01-05
Historical
Revised
J2521_200306
2003-06-03
Historical
Revised
J2521_200105
2001-05-14
Historical
Issued

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