SAE J2521_201304
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Disc and Drum Brake Dynamometer Squeal Noise Test Procedure
Hardcopy , PDF
14-10-2022
English
11-04-2013
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1. SCOPE
2. REFERENCES
3. DEFINITIONS
4. TEST EQUIPMENT
5. TEST FIXTURE
6. TEST INERTIA
7. PARTS PREPARATION AND TEST SETUP
8. TEST CYCLES
9. TEST SEQUENCES NOMENCLATURE
10. DISC BRAKE TEST PARAMETERS AND TEST MATRIX
11. DRUM BRAKE TEST PARAMETERS AND TEST MATRIX
12. NOISY BRAKE APPLICATIONS
13. SUMMARY OF TEST RESULTS
14. TEST INPUT PARAMETERS AND SETUP PER EKB 3010
15. NOTES
APPENDIX A - NOISE AND FRICTION SUMMARIES
APPENDIX B - EKB 3010 TEST PARAMETERS
APPENDIX C (INFORMATIVE) - COOLING AIR SPEED AND
AIR FLOW PER ISO 3966
Pertains to high frequency squeal noise occurrences for on-road passenger car and light trucks below 4,540 kg of GVWR.
| DocumentType |
Standard
|
| Pages |
44
|
| PublisherName |
SAE International
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
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.
| BS ISO 15484:2008 | Road vehicles. Brake lining friction materials. Product Definition and quality assurance |
| 06/30079861 DC : DRAFT JULY 2006 | ISO 15484 - ROAD VEHICLES - BRAKE LININGS FRICTION MATERIALS - PRODUCT DEFINITION AND QUALITY ASSURANCE |
| ISO 15484:2008 | Road vehicles Brake lining friction materials Product definition and quality assurance |
| SAE J2625_201707 | Automotive Vehicle Brake Squeal Test Recommend Practice |
| IEC 61672-2:2013+AMD1:2017 CSV | Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests |
| SAE J2598_201207 | Automotive Disc Brake Pad Natural Frequency and Damping Test |
| VDA 305 : 2013 | EKB 3008 DATA EXCHANGE FORMAT |
| VDA 303 : 2009 | DESCRIPTION OF NOISY BRAKE APPLICATIONS CONCERNING BRAKE SQUEAL |
| VDA 300 : 2009 | DEVELOPMENT GUIDELINE ON QUALITY CONTROL OF DISC BRAKE LININGS |
| SAE J3001_201604 | Brake Insulator Damping Measurement Procedure |
| SAE J2789_201008 | Inertia Calculation for Single-Ended Inertia-Dynamometer Testing |
| SAE J2933_201103 | Verification of Brake Rotor Modal Frequencies |
| IEC 61672-3:2013 | Electroacoustics - Sound level meters - Part 3: Periodic tests |
| SAE J2625_200802 | Automotive Vehicle Brake Squeal Test Recommend Practice |
| VDA 306 : 2013 | DEFINITION OF CHARTS FOR THE EVALUATION OF BRAKE NOISE DATA/DYNAMOMETER |
| SAE J2786_200910 | Automotive Brake Noise and Vibration Standard Nomenclature |
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