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Developed for Class 7–8 interstate tractors, regional distribution chassis, and heavy-duty trailers across North America, these Brake Linings FMSI 4718Q offer a high-performance foundation reline solution. Tailored specifically for 16.5" x 6" Q-Plus profile foundation brake shoes, this low-metallic non-asbestos friction block set delivers responsive air-brake deceleration, exceptional high-temperature fade resistance, and uniform drum contact across severe-duty line-haul lanes.
Maintaining predictable stopping torque and ensuring strict FMVSS-121 compliance under demanding gross vehicle weight ratings requires wheel-end friction materials that resist high-heat decay. Sustained downhill mountain descents and high-frequency urban stop-and-go delivery cycles generate extreme operating temperatures, where substandard friction segments experience accelerated thickness loss, friction glazing, and aggressive drum grooving.Our Brake Linings FMSI 4718Q deliver genuine OEM-level dimensional accuracy and heavy-duty mechanical reliability tailored for North American fleet operations.
High-Density Non-Asbestos Friction Compound
Formulated with an advanced low-metallic, non-asbestos matrix, each 4718Q friction segment undergoes high-pressure hydraulic molding followed by controlled thermal post-curing. This resilient formulation maintains a stable, uniform friction coefficient across extreme working temperatures reaching 750°F (400°C), eliminating brake fade during prolonged deceleration and emergency stopping maneuvers.
Precision Hole Pattern & Drum-Friendly Wear Profile
Every lining segment features factory-drilled, chamfered rivet holes precisely aligned with standard 16.5" x 6" Q-Plus steel shoe tables. This ensures maximum mechanical shear resistance and vibration stability under severe braking torque spikes. The balanced friction matrix encourages smooth, uniform sweep across commercial brake drums, significantly mitigating localized hot spots, drum scoring, and edge taper wear.
Key Features & Specifications
Target Foundation Fitment: Purpose-built for North American standard FMSI 4718Q commercial brake shoe tables on 16.5" x 6" Q-Plus drum brake assemblies.
FMVSS-121 Certified Compound: Commercial-grade non-asbestos friction formulation provides short stopping distances, low dust output, and dependable thermal stability.
High Thermal Fade Resistance: Thermally cured to operate continuously under heavy line-haul cycles with consistent friction levels up to 750°F (400°C).
Precision Rivet Alignment: CNC-machined rivet hole positions guarantee effortless mechanical fastening and maximum shear load integrity on Q-Plus shoe skeletons.
Extended Drum & Lining Life: Smooth, balanced friction matrix minimizes drum micro-grooving, heat cracking, and uneven shoe taper wear.
Frequently Asked Questions (FAQ)
Q1: Which vehicle applications and axle configurations use these Brake Linings FMSI 4718Q?
A: These friction blocks are engineered for North American Class 7 and Class 8 commercial tractors, straight trucks, and freight trailers utilizing 16.5" x 6" Q-Plus foundation drum brake configurations across drive and trailer axles.
Q2: What is the main dimensional difference between FMSI 4718Q and standard 4707Q linings?
A: While both belong to the 16.5-inch drum diameter Q-Plus foundation family, the 4718Q profile is engineered for narrower 6-inch shoe tables, whereas 4707Q is built for standard 7-inch wide brake shoes.
Q3: Are the rivet holes factory pre-drilled in the lining blocks?
A: Yes. All 4718Q lining segments arrive precision-drilled and counterbored to match OEM rivet patterns for immediate mechanical fastening onto bare steel shoe cores.
Q4: How do these linings perform under sustained mountain descents and high-heat cycles?
A: The friction material undergoes a specialized thermal post-curing process to prevent glazing and brake fade, ensuring rapid heat dissipation and reliable torque recovery under heavy braking duty.
Q5: Can you provide customized packaging, edge-code stamping, and palletized bulk shipping?
A: Yes. As a direct manufacturing source, we provide custom part-number edge printing, private-brand packaging boxes, and export-grade pallet packaging tailored for North American parts distributors and fleet suppliers.
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