Electronic Brake Control Systems - Sure Track Brake System: Description: Notes

CHANGES, CAUTIONS, CORRECTIONS 

• 1970 & 1973 MID-YEAR PRODUCTION CHANGE NOTE:  Improvements in the Sure Track System were incorporated in production beginning Jan. 15, 1970. References to "Early Type" and "Late Type" apply to components used before and after this date. Note that the control module (included in this 1970 production change) also received a mid-1973 change; differences in these modules will be indicated by identification number stamped on control module case: DD0SA-2B373-B, before Jan. 15, 1970; D2MA-2B373-AA, Jan. 15, 1970 to mid-1973; D3LA-2B373-AA, after mid-1973.
  NOTE: Components without an early or late designation were not changed and may be used with any changed components.
• REAR AXLE LEAKAGE AT SURE TRACK MOUNTING BRACKET:  Rear axle lubricant leakage may be corrected as follows: Remove two nuts and washers securing mounting bracket. Remove bracket and two copper washers. Clean studs and surrounding area. Apply a liberal amount of suitable sealer (B5A-19554-A) to threads of studs. Install new copper washers, flat washers, and stud nuts, and torque to 25-40 ft. lbs.

System is designed to prevent loss of control during emergency or maximum braking condition. To avoid wheel lockup and resultant skidding with brakes fully applied, system automatically releases and re-applies rear brakes up to four alternating cycles per second. System consists of three major components: