Brake Dynamometer Squeal Noise Test Procedure for Commercial Vehicles with Air Brakes
J3213_202306
This SAE Recommended Practice applies to commercial vehicles above 4540 kg of gross vehicle weight rating equipped with air brakes used under normal operating conditions. The procedure incorporates high and low-temperature test matrices, but does not fully account for the effects of the environment on brake squeal. Much research is currently underway in this area. This document defines brake squeal as a peak noise level of at least 80 dB(A) between 500 Hz and 17 kHz for air disc and drum brakes on on-road vehicles.
Rationale:
Commercial vehicle (CV) manufacturers and their suppliers need a standard laboratory method to assess the propensity of the foundation brakes to generate squeal noise. The early engineering assessment for noise provides a baseline during the vehicle or brake system development process. This document allows multiple parties to speak to the same parameters when reviewing squeal noise testing and before vehicle evaluations. A systematic squeal noise test procedure supports the entire supply chain for the lifetime of the braking system.
Related Topics:
Commercial vehicles
Air brakes
Noise
Also known as: SAE J 3213
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