J2521_201304 Disc and Drum Brake Dynamometer Squeal Noise Test Procedure

Revised

04/11/2013

Features
Issuing Committee
Scope
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/J2521_201304
Pages
44
Citation
SAE International Recommended Practice, Disc and Drum Brake Dynamometer Squeal Noise Test Procedure, SAE Standard J2521_201304, Revised April 2013, Issued May 2001, https://doi.org/10.4271/J2521_201304.
Additional Details
Publisher
Published
Apr 11, 2013
Product Code
J2521_201304
Content Type
Recommended Practice
Status
Revised
Language
English