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Howto select a quality lining. The various linings described in this brochure have not been listed with coefficient of friction edgecodes, since these tend to be misleading if judged in the absence of all other factors. For example, a material with a very high coefficient of friction will develop high brake torque, but may also have short lining life and wear out the brake drum in a short period of time. Or, it may be too effective for vehicle control. An edgecode on the lining only indicates the initial friction properties of the material. These properties, rated in accordance with SAE practices, are the result of testing a 1" square piece of the friction material on a laboratory friction machine. They tell nothing about wear charac teristics. or ability to perform under adverse braking conditions. When you select a friction material, look first at quality-- the assurance of safe, predict able performance of die material under all operating conditions. The total capabili ties and integrity of the manufacturer are paramount in the production of a consistent, top quality friction material. That's why you should judge all of the performance characteristics, not just friction rating. And why American Brakeblok, with its quality consistency year after year, is a leader in the aftermarket. NAPA jobbers across the country are aftermarket leaders not only because of their technical competence, but also for their service to their customers. This Mobile Training Unit, helpful in training operating and mcuntenace personnel, is just one of the many services available from the NAPA jobber who stocks American Brakeblok Goings. 3001 W. Big Beaver Road, Troy. Michigan 48084 NOV016233