Engineered for Class 7–8 commercial tractors, heavy-haul chassis, and severe-duty vocational trailers across North America, the 4720 Repair Kit delivers a dedicated single-wheel foundation overhaul solution. Tailored specifically to service standard 16.5" x 5" and 16.5" x 6" foundation drum brake assemblies using 4715Q and 4720Q brake shoes, each kit bundles fatigue-resistant dual-spring return systems, quick-fit anchor pin retention clips, induction-hardened cam rollers, and anti-friction bushings. This consolidated hardware pack eliminates brake drag, maintains balanced retraction force, and speeds up routine preventative maintenance bay turnaround.
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