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:
Windows
Manual Windows
If equipped, use the window crank to open and close each window.
See Manual Windows.
Power Windows
If equipped, press the switch down to open the window. Pull the front of the
switch up to close it.
The switches work when the vehicle is in ON/RUN or ACC/ ACCESSORY, or when Re ...
Rear Seat Cushion Cover and Pad Replacement
Rear Seat Cushion Cover and Pad Replacement
Callout
Component Name
Preliminary Procedure
Remove the rear seat cushion. Refer to Rear Seat Cushion Removal and
Installation
1
Rear Seat Cushion Cov ...
Differential Case Assemble
Special Tools
J-810721 Axle Shaft Seal Remover Support Base
R-0407011 Bearing Race Remover
R-0407012 Differential Carrier Cone Bearing Cap Driver
R-0007761 Universal Handle for Pullers and Installers
S-9407194 Speed Sensor Impeller Ring Installer
S-9407195 Pinion Gear Case Bearing I ...
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