(drum brake linings)
Modern drum brake linings
operate within 200-450°C temperature ranges, requiring composite materials that maintain 0.35-0.42 friction coefficients across conditions. Industry data reveals:
Premium formulations now integrate ceramic-reinforced matrices with metallic stabilizers:
Material Type | Noise Level | Wear Rate | Cost Index |
---|---|---|---|
Organic | 72 dB | 0.15mm/1k mi | 1.0x |
Semi-Metallic | 68 dB | 0.12mm/1k mi | 1.3x |
Ceramic Hybrid | 63 dB | 0.08mm/1k mi | 1.8x |
Brand | Warranty | Stopping Distance | Return Rate |
---|---|---|---|
Brand A | 24 mo/30k mi | 132ft @60mph | 2.1% |
Brand B | 36 mo/45k mi | 127ft @60mph | 1.4% |
Brand C | 18 mo/25k mi | 139ft @60mph | 3.6% |
Specialized formulations address unique requirements:
Mandatory replacement triggers:
Proper adjustment ensures 0.25-0.50mm running clearance:
Emerging solutions feature laser-etched friction surfaces and embedded sensors:
(drum brake linings)
A: Drum brake linings should be replaced when their thickness wears down to 1/8 inch (3.2 mm), if contaminated with grease/oil, or if cracked/glazed. Visible wear indicators or scraping noises also signal replacement needs.
A: Drum brake linings are friction material bonded to brake shoes that press against the rotating drum to create stopping power. They consist of heat-resistant compounds designed for controlled wear.
A: The brake shoe return springs maintain proper clearance between linings and drum when brakes are disengaged. Weak springs can cause dragging and premature wear.
A: Remove the brake drum to visually check for uneven wear, contamination, or thinning below manufacturer specifications. Measure lining thickness with a gauge at multiple contact points.
A: Yes with proper tools and mechanical knowledge, but requires drum removal and spring adjustment. Professional installation is recommended for proper lubrication and tensioning of components.