SAE J2521

Description / Abstract: 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.

Purpose

This recommended test practice is intended to establish a common method to perform a series of screening test sequences that identify the propensity of a brake assembly to generate squeal noise under a variety of test conditions. The result is an evaluation of brake noise under a set of defined braking conditions that are believed most relevant to braking system development for automobiles.

A disc brake application matrix and a drum brake application matrix are defined to describe the test conditions and steps to investigate the influence of pressure, temperature and velocity on squeal noise behavior. Each matrix is intended to replicate vehicle tests to get a fair comparison for different brake corner components.