How to Service and Repair Duo-Servo Drum Brake Shoes on Cadillac Escalade?

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First, you should raise the vehicle and safely support it on stands before starting to service and repair the duo-servo drum brakes. Mark the connection between the wheel and the hub and then take out the tire and wheel. After that, identify how the drum is linked to the axle and take it off. Go on to carefully remove the return springs, shoe guide, hold down springs and hold down pins. Take out the actuator lever and the lever pivot and then detach the lever return spring and actuator link. First, separate the park brake strut and the strut spring, then take out the park brake lever and adjusting screw assembly, plus the screw spring. Go over each area for signs of heat or stress damage, changing parts as required and watch out for wear. Make sure the Wheel Cylinder is not leaking and that the Brake Drum meets machining requirements. Pour a thin layer of white lithium grease or something similar on each shoe pad and the inside of the adjustment screw threads before installing. Mount the adjusting screw assembly and adjusting screw spring to each shoe, so the coils do not touch the adjusting screw. Join the shoe assembly to the backing plate, then place the parking brake lever, strut spring and park brake strut. After that, put the actuator lever and lever pivot together and continue with the link and lever return spring. Put the hold down pins, hold down springs, shoe guide and return springs in place. Next, fit the drum back in place, so the marks from the previous assembly are matched and install the tire together with the wheel, also making sure the marks are aligned. After that, finish the job by checking and adjusting the rear brakes.

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