Brake Rating Power Requirements—Truck and Bus

Standard:
Revised:
  • 2011-08-04
 
  • CURRENT
Publisher:
  • SAE International
Pages:
2
Scope:

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.

Rationale:

Deletion of obsolete terminology (i.e. horsepower). Revision to the brake system service pressure ranges, both hydraulic and air, to more accurately reflect typical system service pressure ranges and governor cut-in pressure settings in accordance with current industry practices..

History:
Standard Published Revision Status
J257_201108 2011-08-04 Latest Revised
1997-02-01 Historical Revised
1985-03-01 Historical Reaffirmed
AKA:
  • SAE J 257
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