Chevrolet Sonic Repair Manual: Drum Brake System Description and Operation
- System Component Description
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The drum brake system consists of the following:
- Drum Brake Shoes
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Applies mechanical output force, from hydraulic brake wheel cylinders, to friction surfaces of brake drums.
- Brake Drums
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Uses mechanical output force applied to friction surface from drum brake shoes to slow speed of tire and wheel assembly rotation.
- Brake Drum Hardware
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Secures drum brake shoes firmly in proper relationship to hydraulic brake wheel cylinders. Enables sliding motion of brake shoes needed to expand toward friction surface of drums when mechanical output force is applied. Provides return of brake shoes when mechanical output force is relieved.
- Brake Drum Adjusting Hardware
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Provides automatic adjustments of brake shoes to brake drum friction surface whenever brake apply occurs.
- System Operation
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Mechanical output force is applied from the hydraulic brake wheel cylinder pistons to the top of the drum brake shoes. The output force is then distributed between the primary and secondary brake shoes as the shoes expand toward the friction surface of the brake drums. The brake shoes apply the output force to the friction surface of the brake drums, which slows the rotation of the tire and wheel assemblies. The proper friction of both the drum brake hardware and adjusting hardware is essential to the proper distribution of braking force.
Drum Brake Hardware Replacement (J93, J94)
Removal Procedure
Warning: Refer to Brake Dust Warning.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the tire and wheel assembly. Re ...
Parking Brake Adjustment (Drum Brake)
Note: The park brake cable adjusting nut is a nylon lock type. Use
ONLY HAND TOOLS whenever tightening or loosening the adjusting nut.
Apply and fully release the park brake several times ...
Other materials:
DIC Menu Items
Press MENU to view the DIC menus. Some items display in the upper display area,
some in the lower display area, and others use both the upper and lower display
areas. Use to scroll through the menu
items. Not all items are available on every vehicle. The following is a list of
all possible ...
Tread Wear Indicators Description
The original equipment tires have tread wear indicators that show when you should
replace the tires.
The location of these indicators are at 60 degree intervals around the outer
diameter of the tire. The indicators appear as a 6 mm (0.25 in) wide band when the
tire trea ...
Steering Gear Boot Replacement
Special Tools
CH-804 Tensioner
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the steering linkage outer tie rod. Refer to Steering Linkage
Outer Tie Rod Rep ...
0.0064