Occupational Safety and Health Administration OSHA

Alert: Due to routine maintenance on the OSHA website, some pages may be temporarily unavailable.
To report an emergency, file a complaint with OSHA or ask a safety and health question, call 1-800-321-6742 (OSHA).

Back to eTools

Construction eTool

Struck-by Brake Systems

Image of wheel with chock behind it

All motor vehicles and mechanized equipment used in construction are required to have:

  • A service brake system, for slowing or stopping the vehicle during normal operations.
  • An emergency brake system, as a back-up in the event that the service brake fails.
  • A parking brake system, sometimes referred to as a hand brake.

It is permissible for these systems to share components, but in all cases they are each required to be maintained in good working condition, e.g. if the service brake and parking brake are working, they do not make up for a defective emergency brake.

Sometimes, additional assistance may be necessary. For example, when parking on an incline, parking brakes alone may need to be augmented by chocks under the wheels.

Additional Information:

Back to Top

Thank You for Visiting Our Website

You are exiting the Department of Labor's Web server.

The Department of Labor does not endorse, takes no responsibility for, and exercises no control over the linked organization or its views, or contents, nor does it vouch for the accuracy or accessibility of the information contained on the destination server. The Department of Labor also cannot authorize the use of copyrighted materials contained in linked Web sites. Users must request such authorization from the sponsor of the linked Web site. Thank you for visiting our site. Please click the button below to continue.