Document YrzKLQ2K1M45KaOzN3JRKkOKO

PLAINTIFF'S EXHIBIT Intra-Company Communication March 11, 1965 TO: , Mr. X. D. Marande cc: Messrs. A. X. Anderson R. B. Madison J. R. Forrester, Jr. V. A. McConnell R. L. Geeler J. V. Richards B. T. Howes V. K. Bkuba H. V. Johnson FROM: 8. Gretch and T. B. Risk SUBJECT: Brahe Lining Program -- February 1965 Evaluation of Current Materials The screening rig was used to re-examine a current production secondary lining (Raybestoa-Manhattan dry mix R3488-1) vhich had Bhovn large variations in friction properties in August ' At that time marked differences both in friction and wear rates were observed in both hard and soft samples and between hard and soft sections of the same sample. The samples of current material were touch more consistent in properties and in addition they did not exhibit the composition and structure defects vhich had been observed last August. Three samples each of 19^3 Lincoln primary and secondary linings were tested. The laboratory results indicated that all of the primary samples were satisfactory. However, among the secondary linings, sample 106 delaminated readily, had a lower specific gravity, and wore out much more rapidly than the other two samples particularly after the first 0.020 inches were removed. Sample 9& appeared to be the beet material and was found by chemical tests to be of different organic composition than 106 and 118. A second screening rig is being built in order to accelerate the program. Friction Studies Analytical studies have been started to determine the distribution of load and temperature for drum brake linings under different conditions of operation. These studies should provide direction for the optimisation of physical and frictional properties of brake linings. Detailing work on the friction research test machine is progressing ss scheduled. FORM 177 ........ _. ...... ... 8003 0220 PRODUCED BY FORD TO: Mr. E. D. Martiude Page 2 March 11, 1965 Application Studies Chemical characterization of the current non-Bllp differential friction material (R-1698*0 have been completed. The varloue components of interest were tested for possible attack by M2C57 hypoid gear lubricant to determine what changes in the friction material would be required to prevent attack by this fluid. It was found that metallic lead end aluminum and probably crocidolite asbestos are unaffected. Preparations are being made to use an Amsler friction machine for the study of modified friction materials based on these resistant components. ` An investigation was undertaken to determine the feasibility of reducing the squeal level of a noisy brake show lining by using a rubber interlayer between the lining and the shoe. Initial tests showed that the interlayer magnified the squeal instead of reducing it; therefore, work along these lines was discontinued. Dfy Clutch Friction A test sequence was devised for rating engagement smoothness, wear, and friction level of clutch facings. Four materials have been tested to date. A program for more extensive testing is being developed in co-operation with the Engineering Methods Development and with Ford Division personnel. Serge Gretch SG:TKR:bJw T. H. Risk /' 8003 0221 PRODUCED BY FORD