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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.
High-mileage freight transport, regional delivery cycles, and severe payload distributions exert extreme mechanical and thermal stress on commercial drum brake foundations. Over extended service intervals, sustained friction heat degrades return spring tension and develops flat spots on cam rollers, causing sluggish shoe release, accelerated friction taper wear, and hazardous drum heat-checking.Our 4720 Repair Kit provides tight OEM-standard dimensional tolerances and severe-duty metallurgy engineered specifically for North American fleet operations.
High-Tensile Metallurgy & Hardened Roller Hardware
Every extension return spring and retaining clip is fabricated from high-tensile alloy spring steel subjected to computer-controlled oil quenching and tempering. This heat-treatment process ensures constant elastic pull force and prevents thermal relaxation under continuous operating temperatures exceeding 750°F (400°C). The included anchor pins and cam rollers feature induction-hardened wear surfaces that eliminate cam flat-spotting and maintain smooth mechanical power transmission under 20,000 to 23,000 lbs GAWR commercial payload demands.
Severe-Duty Anti-Rust Barrier & Single-SKU Wheel Servicing
All steel components receive an industrial electro-plated zinc-dichromate or heavy phosphate coating, forming an impervious barrier against highway salt spray, calcium chloride de-icers, moisture, and road contaminants. By bundling all matched springs, pins, retainers, and bushings into a single master SKU, fleet maintenance facilities can service 4715Q and 4720Q brake shoe setups in one operation without mixing aged hardware or stocking fragmented loose parts.
Key Features & Specifications
Direct Q-Plus Fitment: Purpose-built for North American commercial 4715Q and 4720Q foundation brake shoes on 16.5" x 5" and 16.5" x 6" axle assemblies.
Fatigue-Resistant Spring Metallurgy: Oil-tempered alloy spring steel ensures rapid, balanced shoe retraction across extended highway duty cycles.
Induction-Hardened Rollers & Pins: Case-hardened steel rollers resist surface grooving and ensure smooth camshaft power transmission.
Severe-Duty Chemical & Salt Protection: Zinc-dichromate coating provides an impenetrable barrier against road brine, salt spray, and winter de-icing chemicals.
Turn-Key Foundation Overhaul Bundle: Master hardware kit bundles heavy-duty return springs, retaining clips, anchor pins, and cam rollers for immediate wheel-end maintenance.
Frequently Asked Questions (FAQ)
Q1: Which brake shoe profiles are compatible with this 4720 Repair Kit?
A: This kit is engineered specifically for North American commercial drum brake setups utilizing 4715Q and 4720Q foundation brake shoes across steer, drive, and trailer axles.
Q2: What is the primary difference between a 4720 Repair Kit and standard 4707 kits?
A: While both belong to the Q-Plus foundation family, the 4720 Repair Kit is optimized for the specific shoe geometry, spring tensions, and roller clearances required by 4715Q (16.5" x 5") and 4720Q (16.5" x 6") narrower-width applications.
Q3: Why should hardware be replaced during every brake shoe replacement?
A: Operating friction heat permanently degrades spring tension and wears flat spots on rollers. Reusing weakened hardware causes incomplete shoe retraction, continuous brake drag, drum glazing, and uneven lining taper.
Q4: How does the surface coating withstand severe winter highway chemicals?
A: All components receive an industrial zinc-dichromate or phosphate finish that passes strict salt-spray tests, effectively resisting rust from calcium chloride, road salt, and humidity.
Q5: Are private labeling, custom packaging, and palletized bulk shipping supported?
A: Yes. As a direct factory manufacturer, we support custom polybag branding, private-label master cartons, and palletized export packaging for North American parts distributors and fleet suppliers.
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