Like the rest of Chevrolet's 1958 full size car line-up, the Brookwood featured Chevrolet's new "Safety-Girder" cruciform frame. Similar in layout to the frame adopted for the 1957 Cadillac, it featured box-section side rails and a boxed front cross member that bowed under the engine. These "X-frames" were used on other 1958 to 1964 Chevys, as well as some Cadillacs. The rear was tied together by a channel-section cross member. This design was later criticized as providing less protection in the event of a side impact collision, but it persevered until 1965.
