GM Full Size Vans 1967-1986 Repair Guide

Brake Disc (Rotor)

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INSPECTION



The minimum wear thickness, 1.215 in. (30.861mm), is cast into each disc hub. This is a minimum wear dimension and not a refinish dimension. If the thickness of the disc after refinishing will be 1.230 in. (31.242mm) or less, it must be replaced. Refinishing is required whenever the disc surface shows scoring or severe rust scale. Scoring not deeper than 0.015 in. (0.381mm) in depth can be corrected by refinishing.

Some discs have an anti-squeal groove. This should not be mistaken for scoring.

REMOVAL & INSTALLATION

See Figures 1 through 5

  1. Follow the procedures outlined for removing the caliper assembly.
  2.  
  3. Remove the bearing dust cap, cotter pin, center nut, and outer bearings.
  4.  
  5. Pull the rotor off the spindle and service it, as necessary.
  6.  

To install the unit, reverse the removal procedure. Check the rotor before install it. Pack the inner and outer bearing to the proper specifications. (See Wheel Bearings).



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Fig. Fig. 1: Remove the dust cap using a prytool



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Fig. Fig. 2: Remove the cotter pin ...



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Fig. Fig. 3: ... then remove the castellated nut



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Fig. Fig. 4: Remove the outer bearing assembly ...



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Fig. Fig. 5: ... then remove the rotor

 
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