Document a1q8Y5K7R2baj9gDE5dYnJMk9

TABLE OF CONTEXTS (Continued) Page 3.5.4 SAE Recommended Practices for Evaluating Brake Systems and Friction Materials ............................. 48 4. PERFORMANCE ATTRIBUTES OF FRICTION MATERIALS NOW IN USE ................. 51 4J1 Section Summary . ................................................................................... 51 4.2 Introduction to Friction Material Formulations ...... 52 4.3 Asbestos-Based Friction Materials .................................................. 53 4.4 Non-Asbestos Friction Materials ...... ................................. t 4.4.1 Semimetallic Friction Materials........... 55 56 4.4.2 Non-Asbestos Organic Friction Materials ..................... 57 4.4.3 Sintered Metallic Friction Materia-ls..................................58 4.4.4 Carbon-Carbon Friction Materials ............................. . . 59 4.5 Aftermarket Vehicle Considerations . . .......................................... 59 4.5.1 Drum Brakes........................................................................................ 59 4.5.2 Disc Brakes.............................................. . ............................. 60 4.5.3 Factors Affecting Substitution of Friction Materials..................................................... 60 4.6 Direct Comparison of OEM arid Aftermarket Brake Linings.......................................................................................... 65 4.6.1 Dynamometer Test Data .............................................................. 65 4.6.2 Vehicle Test Data............................................................................68 4.7 Issues of Consumer Acceptability of Non-Asbestos Materials ........................................................................... 70 5. REVIEW OF VEHICLES AFFECTED BY PROPOSED BAN .......................................... 72 5.1 Section Summary ............................................................................................ 72 5.2 Brake System Trends in Passenger Cars, Trucks, and Equipment .............................................................. ... . 73 vii