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Engineered for Class 7–8 interstate highway tractors, vocational dump units, and multi-axle chassis operating across North America, these Brake Linings FMSI 4720 deliver a specialized foundation reline solution. Molded specifically to match 16.5" x 5" foundation brake shoes, this low-metallic non-asbestos friction block set provides smooth pneumatic deceleration, superior resistance to high-temperature fade, and balanced drum life under demanding commercial haul conditions.
Maintaining predictable stopping distance and fulfilling strict FMVSS-121 performance standards under heavy payload capacities requires commercial friction materials capable of resisting continuous mechanical and thermal fatigue. Severe stop-and-go vocational runs and frequent mountain descents generate extreme wheel-end temperatures, where substandard compounds experience accelerated thickness erosion, surface glazing, and aggressive drum grooving.Our Brake Linings FMSI 4720 deliver genuine OE-level dimensional accuracy and heavy-duty structural durability tailored for North American fleet operations.
High-Density Non-Asbestos Friction Formulation
Formulated with an advanced low-metallic, non-asbestos composite, each 4720 friction block undergoes high-pressure hydraulic molding followed by controlled oven post-curing. This resilient compound maintains an optimal, stable friction coefficient across working temperatures up to 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 that align accurately with standard 16.5" x 5" commercial brake 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 grooving, and edge taper wear.
Key Features & Specifications
Target Foundation Fitment: Purpose-built for North American standard FMSI 4720 commercial foundation brake shoes on 16.5" x 5" 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 duty 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 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 types and axle configurations use these Brake Linings FMSI 4720?
A: These friction blocks are engineered for North American Class 7 and Class 8 commercial vehicles equipped with narrower 16.5" x 5" foundation drum brake shoes, commonly specified on specialized drive, steer, or vocational chassis configurations.
Q2: What is the primary dimensional difference between FMSI 4720 linings and standard FMSI 4707 or 4515 linings?
A: While operating within the standard 16.5-inch drum diameter, FMSI 4720 linings are configured for 5-inch shoe widths, providing dedicated friction contact for narrower brake assemblies compared to standard 7-inch wide shoes.
Q3: Are rivet holes pre-drilled in the lining blocks?
A: Yes. All 4720 lining segments come precision-drilled and counterbored to match OEM rivet hole patterns for immediate fastening onto bare steel shoe cores.
Q4: How do these linings perform under sustained downhill braking and high-temperature conditions?
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 cycles.
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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