Cobalt 2006-2008, G5 2007

Brake Pads

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Inspect the fluid level in the brake master cylinder auxiliary reservoir.
  4.  
  5. If the brake fluid level is midway between the maximum-full point and the minimum allowable level, no brake fluid needs to be removed from the reservoir before proceeding.
  6.  
  7. If the brake fluid level is higher than midway between the maximum-full point and the minimum allowable level, remove brake fluid to the midway point before proceeding.
  8.  
  9. Raise and support the vehicle.
  10.  
  11. Remove the tire and wheel assembly.
  12.  
  13. Install and firmly hand tighten 2 wheel nuts to opposite wheel studs in order to retain the rotor to the hub.
  14.  
  15. Install a large C-clamp, over the body of the brake caliper with the C-clamp ends against the rear of the caliper body and against the outer brake pad.
    WARNING
    When using a large C-clamp to compress a caliper piston into a caliper bore of a caliper equipped with an integral park brake mechanism, do not exceed more than 1mm (0.039 in.) of piston travel. Exceeding this amount of piston travel will cause damage to the internal adjusting mechanism and/or the integral park brake mechanism.

  16.  
  17. Tighten the C-clamp just enough to compress the caliper piston 0.039 inch (1mm) of travel only.
  18.  
  19. Remove the C-clamp from the caliper.
  20.  
  21. While using a wrench on the flats of the caliper guide pins, remove the brake caliper guide pin bolts.
    WARNING
    Support the brake caliper with heavy mechanic's wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.

  22.  
  23. Without disconnecting the hydraulic brake flexible hose, remove the caliper from the mounting bracket and secure the caliper with heavy mechanics wire, or equivalent.
  24.  
  25. Remove the brake pads from the caliper mounting bracket.
  26.  
  27. Remove the brake pad retainers (1) from the caliper bracket.

    Click image to see an enlarged view

    Fig. Rear brake pads and retainers

  28.  
  29. Thoroughly clean the brake pad hardware mating surfaces of the caliper bracket (2), of any debris and corrosion.
  30.  
  31. Inspect the brake caliper guide pins for freedom of movement, and inspect the condition of the guide pin boots. Move the guide pins inboard and outboard within the bracket bores, without disengaging the slides from the boots, and observe for the following:

    Restricted caliper guide pin movement
     
    Looseness in the brake caliper mounting bracket
     
    Seized or binding caliper guide pins
     
    Split or torn boots
     

  32. &nbs