Chevrolet Cobalt Service & Repair Manual: Brake Service
Removal
| 1. |
Raise and support rear of vehicle,
then remove tire and wheel assembly. |
| 2. |
Mark drum and axle hub, then remove
brake drum. If brake lining is dragging on brake drum, back off
brake adjustment by rotating adjustment screw. If brake drum
is rusted or corroded to axle flange and cannot be removed, lightly
tap axle flange to drum mounting surface with suitable hammer. |
| 3. |
Unhook primary and secondary return
springs using brake spring removal and installation tool Nos. J-8049
or J-29840, or equivalents, Fig. 1. Observe
location of brake components being removed to aid during installation. |
| 4. |
Remove brake hold-down springs with
suitable tool. |
| 5. |
Lift actuating lever, then unhook and
remove actuating link from anchor pin. |
| 6. |
Remove actuating lever(s) and return
spring. |
| 7. |
Spread shoes apart and remove parking
brake strut and spring. |
| 8. |
Disconnect parking brake cable from
lever and remove brake shoes from backing plate. |
| 9. |
Separate brake shoes by removing adjusting
screw and spring, then unhook parking brake lever from shoe assembly. |
| 10. |
Clean dirt from brake drum, backing
plate and other components. Do not use compressed air or dry
brush to clean brake components. Clean brake components with water
soaked rag or suitable vacuum cleaner to minimize airborne dust. |
|
Installation
| 1. |
Lubricate parking brake lever fulcrum
with suitable brake lubricant and attach lever to brake shoe. Ensure
lever operates smoothly. |
| 2. |
Connect brake shoes with adjusting
screw spring and position adjusting screw. Ensure adjusting screw
star wheel does not contact adjusting screw spring. Ensure righthand
thread adjusting screw is installed on lefthand side of vehicle
and lefthand thread adjusting screw is installed on righthand side
of vehicle. Ensure star wheel lines up with adjusting hole in backing
plate. |
| 3. |
Lubricate backing plate shoe contact
surfaces with suitable brake lubricant and area where parking brake
cable contacts backing plate. |
| 4. |
Install brake shoes on backing plate
while engaging wheel cylinder links (if equipped) with shoe webbing.
Primary shoe (short lining) faces towards front of vehicle. End
without strut spring should engage parking brake lever and secondary
shoe. End with strut spring should engage primary shoe. |
| 5. |
Connect parking brake cable to parking
brake lever. |
| 6. |
Install actuating levers, actuating
link and return spring. |
| 7. |
Install hold-down springs with suitable
tool. |
| 8. |
Install primary and secondary shoe
return springs using suitable brake spring pliers. |
| 9. |
Measure inside diameter using suitable
brake drum to shoe gauge. |
| 10. |
Adjust brake shoes to dimension obtained
on outside portion of gauge. |
| 11. |
Install brake drum, wheel and tire
assembly. |
| 12. |
If any hydraulic connections have been
opened, bleed brake system. |
| 13. |
Adjust parking brake. |
| 14. |
Inspect hydraulic lines and connections
for leaks. |
| 15. |
Inspect and adjust master cylinder
fluid level. |
| 16. |
Inspect brake pedal for proper feel
and return. |
| 17. |
Lower vehicle and road test. Do
not severely apply brakes immediately after installation of new
brake linings or permanent damage may occur to linings, and/or brake
drums may become scored. Brakes must be used moderately during first
several hundred miles of operation to ensure proper burnishing of
linings. |
|
Fig. 1 Drum brake assembly
These brakes have self-adjusting
shoe mechanisms that ensure proper lining-to-drum clearances at all times.
The automatic adjusters operate only when the brakes are applied as the
v ...
Inspect components for damage
or wear. Inspect wheel cylinder boots for tears, cuts or heat damage. Replace
as required.
Remove wheel cylinder links. If
fluid spills fr ...
Chevrolet Cobalt Owners Manual
Chevrolet Cobalt Service Manual
Adjustments
Inspection