Electronic Brake Control Systems - Electronic Skid Control: Description

CHANGES, CAUTIONS, CORRECTIONS 

• ELDORADO SPEED SENSOR RE-WIRED:  While the 1972 Track Master System routed speed sensor wires through rear axle housing, the 1973 sensor mounts on brake backing plate where it is more easily serviced. Ensure electrical connection is always greased to prevent water entry.
• VACUUM HOSE ROUTING CHANGED:  The brake vacuum hose routing is changed for all cars. Because of the EGR valve and its high operating temperatures, steel tubing is used in this area, rather than rubber.
• MOBILE RADIO EQUIPMENT NOTE:  Citizen's band radios, electronic garage door openers and similar devices with five Watts or less input, or mobile telephone equipment installed in accordance with Bell System Procedure 404-300-200 will not affect System Operation. Other types of radio transmitting equipment require special installation procedures and should be performed by a qualified radio technician.

System is designed to prevent loss of control during emergency or maximum braking condition. To avoid wheel lock up and resultant skidding with brakes fully applied, system automatically releases and reapplies rear brakes up to four cycles per second. System consists of three major components: Speed Sensors, at each rear wheel (except Cadillac Calais, DeVille, and Fleetwood Brougham Sedan which have sensor located at transmission); Controller, under instrument panel; and Modulator (with integral solenoid vacuum valve), on cowl in engine compartment.