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SAE J257

2011 Edition, August 2011

Complete Document

(R) Brake Rating Power Requirements—Truck and Bus

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Product Details:

  • Revision: 2011 Edition, August 2011
  • Published Date: August 2011
  • Status: Active, Most Current
  • Document Language: English
  • Published By: SAE International (SAE)
  • Page Count: 2
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

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.


The purpose of this document is to establish a minimum Brake Rating Power (BRP) level for commercial vehicles tested in accordance with SAE J880.
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