Document B56NpBMnz51wvDvRbJkO3QL3m

i4)0X Jai January 12, 1978 SUBJECT: Abex Report - "L" Car Brake There are two areas of work to report on: 1. Rotor Analysis 2. Dynamometer Temperature/Wear Test 1. Rotor Analysis 1.1 Brinell Hardness Rubbing Surface Internal Production X47 fl ' X49 N X57 w Prod. 7018C Prototype Unknown. 187 207 217 192 187 170-174 179-187 196-207 179-187 170-179 All values for the rubbing surface are the average of 4-5 readings. The structures all look normal.with 95-99% pearlite. Micros are typical type A graphite. Chemical analysis is being conducted by an outside lab and should be received soon. 1.2 It would be helpful if we knew what lining was tested on the last production and prototype rotors as work is presently being done to study the rotor surface under the SEM. 1.3 We would appreciate knowing what various metallurgi cal tests Chrysler and Kelsey-Hayes are conducting on their samples. Any suggestions for additional tests would be welcome. 2. Dynamometer Temperature/Wear Tests Material 70180x57 70180x2 70180x1 70180x62 Burnish .0142/.0273 .009/.0133 .0096/.0126 ,0052/.0096 250 (0/1) .015/.0255 .0182/.0131 .0109/.0324 325 .0087/.0128 .0091/.0211 .0071/.0367 400 .0093/.0125 .0099/.0175 Rotor .0035 .0030 .0034 .0041 SCI 02310