GMC 1976 ZEO 6083 Maintenance Manual page 194

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REAR SUSPENSION
Figure 17-Castilated Nut Removal
8. Remove brake drums, then-
A. Remove outer dust cap (figure 16) and
then remove inner cap.
B. Remove cotter pin and castilated nut (fig-
ure 17).
C. Remove drum, hub, and bearings as a unit
(figure 18).
Figure 18-Removing Hub and Drum
Figure 19-Removing Brake Backing Plate and Brake
Shoe Assembly
9. Referring to Figure 19, remove four bolts and
nuts retaining brake backing plate to control arm.
Repeat procedure on opposite wheel.
10 . Support mounting bracket with floor jack .
Referring to Figure 20, remove two bolts holding
mounting bracket to crossmember. Remove four
bolts holding mounting bracket to frame rail .
Figure 20-Removing Mounting Bracket Retaining
Bolts