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Investigation of Truck Brake Failure

A medium sized duty truck was turning into a construction zone along a curve from one highway to another. Suddenly, the left front brake locked causing a sharp left turn. The truck impacted a concrete construction barriers. Six weeks prior, the truck had a complete brake overhaul. Visual and microscopic examination of the left front brake shoes and other debris contained within the truck wheel and brake drum revealed a loose and highly deformed castellated nut and washer. The brake shoes were visibly damaged and the castellated nut exhibited imbedded brake lining material. Photograph A shows an overall view of the subject brake lining.

break shoe
Photograph A  Brake shoe from subject truck.

This failure and accident occurred as a result of improper installation of the castellated nut during brake shoe replacement and brake overhaul. The brake lining imbedded castellated nut is shown in Photograph B.

deformed castellated nut
Photograph B  Deformed castellated nut and embedded brake shoe material from brake shoe assembly.

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J.E.I. Metallurgical, Inc.

5514 Harbor Town
Dallas, Texas 75287

Phone: (972) 934-0493
Fax: (469) 737-3938
Email: r.c.jerner@metallurgist.com

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