Document Qg1vqG2r40qeZbmDppDJjBzd6

ABEX ABEX Bendix Bendix Bendix 4J6FF 417FF 325FF 336FE 337FE 1971-81 1971-81 1974-Present 1980 1980 ? = Unknown Ifused, the date code consists ofthe last digit ofthe year and three digits for the day of the year. Other drum brake lining segments have been purchased from: Bendix (1946-1980), Raybestos-Manhattan (1946-1980) (Certification Code 910-GF for 1971-1975); Unibond (1980-1985); Thermoid Division ofH.K. Porter (1974-1980); ITT AMCO (1978-1980); Ferodo (1950s); Multibestos (1950s); Universal Friction (1956unknown). Original equipment drum brake lining and shoe assemblies for medium and heavy duty trucks and for buses are purchased either as part of a complete brake assembly or as part of an axle assembly. Engineering information is obtained with regard to these complete assemblies and usually not with regard to their hundreds of components. Therefore, information about the markings on brake linings that GM did not manufacture is generally not available. Identification ofthe suppliers ofthe brake linings for particular trucks and years would involve an extensive search of engineering bills of materials, engineering parts lists, and purchasing records. There are 120-150 rolls of microfilm of engineering bills of materials, 50 boxes of microfiche of engineering parts lists, and 91 rolls of microfilm and 2091 microfiche or purchasing records. From 1979 to present, the engineering parts lists have been supplemented monthly and each supplement would have to be checked to find any new brake assemblies. The process is also complicated because the medium and heavy duty truck business is basically a "customized" business. Practically all heavy duty trucks and most medium duty trucks are ordered to precise customer specifications as to engine. 36