J2521_202210 Inertia Dynamometer Brake Squeal Noise Test Procedure for Vehicles without Regenerative Systems

Revised

10/07/2022

Features
Issuing Committee
Scope
Content
The SAE J2521 procedure applies to high-frequency squeal noise occurrences for on-road passenger cars and light trucks below 4540 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.
For this test procedure, squeal occurs when the peak noise level is at least 70 dB(A) between 1.25 kHz and 16 kHz for tests using 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 the 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_202210
Pages
56
Citation
SAE International Recommended Practice, Inertia Dynamometer Brake Squeal Noise Test Procedure for Vehicles without Regenerative Systems, SAE Standard J2521_202210, Revised October 2022, Issued May 2001, https://doi.org/10.4271/J2521_202210.
Additional Details
Publisher
Published
Oct 7, 2022
Product Code
J2521_202210
Content Type
Recommended Practice
Status
Revised
Language
English