BENDIX TCH-003-039 User's Manual
Contents
1. Technical Bulletin Bulletin No TCH 003 039 A Effective Date 11 5 96 Cancels NA Page 1 of 1 Subject R 12 R 14 RELAY VALVE 10 PSI DIFFERENTIAL OBSOLESENCE All R 12 and R 14 relay valves which incorporate a 10 psi differential crack pressure were obsoleted in 1995 The R 12 and R 14 part numbers that were affected by the obsolescence are 102849 R 12 103137 R 14 103139 R 14 103195 R 12 103229 R 12 108490 R 12 When it is necessary to replace these valves and the 10 psi crack pressure must be maintained it is suggested that R 6 relay valve part number 280243 be considered This R 6 relay valve incorporates a 10 psi crack pressure but does not have the anti compound quick exhaust feature that is part of the R 14 relay valve Important When replacing an R 12 or R 14 that is connected to four service chambers i e tandem axles it will be necessary to use two R 6 relays one for each axle of the tandem This is necessary to maintain the vehicle manufacturer s brake application and release timing For additional information on the R 6 R 12 and R 14 refer to catalog pages 03 B 3 03 B 4C to 03 B 4F respectively
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