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SAE J257 (JUL2019)

Current Revision

Brake Rating Power Requirements - Truck and Bus

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The minimum performance values in this SAE Recommended Practice are applicable to vehicles with brake systems having typical service pressure ranges 0 to 16.6 MPa (0 to 2400 psi) hydraulic or 0 to 945 kPa (0 to 135 psi) air only. SAE J880 not only provides for determining maximum brake rating power capability, but also permits verification of any desired or arbitrary level such as the requirement established herein. The determining criteria for deciding brake rating power capability are: a. Cold brake stopping ability. b. Fade as a result of brake power absorption. c. Hot brake stopping ability following brake power absorption. d. Brake system stability following brake power absorption. e. Functional and structural integrity of brake system following test.

SDO SAE: SAE International
Document Number J257
Publication Date July 18, 2019
Language en - English
Page Count 3
Revision Level 201907
Supercedes
Committee
Publish Date Document Id Type View
July 18, 2019 J257_201907 Revision
Aug. 4, 2011 J257_201108 Revision
Feb. 1, 1997 J257_199702 Revision
March 1, 1985 J257_198503 Revision