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Trailer Parts & Accessories Brake Shoes 3222-A-2003 MERITOR 16.5 Q PLUS Trailer Brake Shoe Brake Lining

The Brake Shoe is a key component in drum brake systems used primarily in heavy-duty trucks, trailers, buses, and commercial vehicles. Installed inside the brake drum, the brake shoe works by pressing friction linings against the inner surface of the rotating drum when the braking force is applied via the S-cam or hydraulic actuator. This contact generates friction, which slows down or stops the vehicle.

Each brake assembly typically includes a primary (leading) and secondary (trailing) shoe per wheel end, designed to optimize braking efficiency under forward motion. The shoes are made from high-strength steel backing plates bonded or riveted with specialized friction material that meets strict safety and environmental standards.

Due to their role in vehicle safety, brake shoes must deliver consistent performance under extreme heat, heavy loads, and adverse weather conditions. They are commonly used in conjunction with automatic slack adjusters, S-cams, return springs, and hold-down hardware to form a complete drum brake system.
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  • Trailer Parts

Attribute Description
Product Name Brake Shoe / Drum Brake Shoe
Common Names Friction Shoe, Lining Shoe, S-Cam Brake Shoe
Application Front/rear axles of trucks, trailers, buses, and commercial vehicles
Backing Plate Material High-tensile steel (Q235 or similar), rust-resistant coating
Friction Linings Riveted or bonded non-asbestos organic (NAO), semi-metallic, or low-copper
Friction Attachment Type Bonded (glued) or Riveted (more durable under high heat)
Operating Principle Expands outward via S-cam or cam mechanism to press lining against drum
Temperature Resistance Up to 400°C (short-term peak)
Standards Compliance ECE R90 Class A/B, FMVSS 105, ISO 9001, GB 5765, DOT, REACH, RoHS
Reusability No – replace as part of regular maintenance or overhaul
Typical Axle Load Range 8,000 kg to 13,000 kg per axle (depending on design)
刹车蹄 -1
刹车蹄 -4


Parameter Specification
Model Number BS-TL28-70
Compatible Brake System Meritor 28 Series, 70" S-Cam, Bendix 28DV
Shoe Dimensions (H × W × Arc) 28 mm × 170 mm × 70" arc length
Friction Material Type Semi-metallic, non-asbestos
Coefficient of Friction (μ) 0.38–0.42 (tested per SAE J661 at various temperatures)
Static Torque Output Up to 22,000 N·m (system-dependent)
Max Operating Temperature 350°C continuous, 400°C peak
Weight (per shoe) ~3.2 kg
Wear Limit Indicator Visual groove or thickness mark (replace at <3 mm)
Approvals E-marked (E1, E9, etc.), meets ECE R90 Class A


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