Document 3eE80B1VMNZmBDkM6rMDJ8nRO

FILE NAME Allied Signal Bendix ASB DATE 1971-1973 DOC ASB039 DOCUMENT DESCRIPTION Bendix Report - Brake Emissions Emission Measurements from Brake and Clutch Linings from Selected Mobile Sources Report 68-04-0020 BRAKE EMISSIONS EMISSION MEASUREMENTS FROM BRAKE AND CLUTCH LININGS FROM SELECTED MOBILE SOURCES M. G. Jacko R. T. DuCharme | Bendix Research Laboratories Bendix Center Southfield Mich 48076 March 1973 Final Report for Period May 1971 - March 1973 Prepared for ENVIRONMENTAL PROTECTION AGENCY Office of Air and Water Programs Ann Arbor Mich 48105 MICRON a hibee gt . 12272 12272 ma 12 72 Figure 8-11 - Asbestos Fiber in Brake Emission These values are given in Figure 8-13 Then it is necessary the number of fibers given in each box in Figure 8-12 by the for the corresponding box as shown in Figure 8-13 to multipl volume **** *- The typical microscopy count shown in Figure Uig is used to calculate asbestos content in the following manner The f of each group are totaled as shown in Table 8-5 The total number of fibers per group n is then multiplied by the average volume per greagrteat V to obtain the product n x V All products are then totalled to arrive at the total volume of asbestos detected tually scanned containing wear the Since only a fraction of the total area is - volume observed must be normalized to the entire # debris Total Fiber Volume by EM or OM Total Area of Filter 3 = Volume obtained cc x No. of Fields Counted x Area of a Fiel = n V x EF x 990 mm Area of Field 8-20 i 4 a : Table 10-13 - Asbestos Content of Automotive Friction Materials Vehicle and Brake Type Passenger Cars Drum Linings Disc Pads Truck Segments Clutch Facings Average composition for use in the calculations in this report Average Percent Asbestos Content by Weight 68 + 5 60 + 55 + 50- 5 60 Sources Estimates made for this study g DECLRATION 10 1 0.1 PERCENT OF DECELERATIONS EXCEEDING g 0.01 82-93 Figure 10-1 - Frequency Distribution of Braking Decelerations 10-11