J257_201108: Brake Rating Power Requirements—Truck and Bus

Features

Issuing Committee: Truck and Bus Brake Systems Committee

Scope

Content

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

Content: 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.

Meta Tags

Topics: Commercial vehicles
Braking systems
Documentation

Details

DOI: https://doi.org/10.4271/J257_201108

Pages: 2

Citation: SAE International Recommended Practice, Brake Rating Power Requirements—Truck and Bus, SAE Standard J257_201108, Revised August 2011, Issued June 1972, https://doi.org/10.4271/J257_201108.

Additional Details