ASABE Completes Development of New Ag Equipment Braking Standards

Wednesday, April 08, 2020
ASABE Completes Development of New Ag Equipment Braking Standards

ST JOSEPH, MICHIGAN— The American Society of Agricultural and Biological Engineers (ASABE) has developed five new standards for braking on agricultural equipment.

The new standards replace ANSI/ASAE S365.9, Braking System Test Procedures and Braking Performance Criteria for Agricultural Field Equipment. They provide updated braking requirements, allowance for higher-speed, light-weight towed vehicles, and define braking interfaces between towed and towing equipment.

The standards are:

  • ANSI/ASABE S648-1, Agricultural Field Equipment Braking – Part 1: General Requirements
  • ANSI/ASABE S648-2, Agricultural Field Equipment Braking – Part 2: Requirements for Agricultural Tractors
  • ANSI/ASABE S648-3, Agricultural Field Equipment Braking – Part 3: Requirements for Self-Propelled and Special Self-Propelled Machines
  • ANSI/ASABE S648-4, Agricultural Field Equipment Braking – Part 4: Requirements for Towed Vehicles
  • ANSI/ASABE S648-5, Agricultural Field Equipment Braking – Part 5: Requirements for the Interface between Towing Vehicle and Towed Vehicles

The standards provide minimum requirements and normative references, define terms and definitions, and establish general test procedures for the performance of braking systems used on agricultural field equipment as defined in ANSI/ASAE S390.6 (ISO 12934:2013), Tractors and machinery for agriculture and forestry - Basic types – Vocabulary.

The standards will improve braking performance and will result in significant changes for some manufacturers.

ASABE members with standards access and those with site-license privileges can access the full-text via electronic download on the ASABE online Technical Library at Others can obtain a download for a fee directly from the library or by contacting ASABE headquarters at A discount is available when purchasing all five documents.

ASABE is recognized worldwide as a standards developing organization for food, agricultural, and biological systems, with more than 280 standards currently in publication. Conformance to ASABE standards is voluntary, except where required by state, provincial, or other governmental requirements, and the documents are developed by consensus in accordance with procedures approved by the American National Standards Institute. For information on this or any other ASABE standard, contact Scott Cedarquist at 269-932-7031, A current listing of all ASABE standards projects can be found on the ASABE web site at

ASABE is an international scientific and educational organization dedicated to the advancement of engineering applicable to agricultural, food, and biological systems. Further information on the Society can be obtained by contacting ASABE at (269) 429-0300, emailing or visiting