SAE J2521_202210

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. The current revision of this SAE Recommended Practice includes updates and extensions to (a) reflect the taxonomy and guidelines from the SAE J3152 Information Report for fixture design, fabrication, and installation; (b) expand individual sections with low temperatures and speeds; (c) expand the sections for friction characteristic to include 30 km/h events at colder temperatures (-5 °C and 40 °C), at 10 bar of brake pressure; (d) increase the maximum fade temperature for rear disc brakes to 300 °C and 400 °C, for the standard and optional schedules, respectively; and (e) include metrics to report the coefficient of friction per the VDA 300.