Chevrolet Sonic Repair Manual: Park Brake System Description and Operation
- System Component Description
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The park brake system consists of the following:
- Park Brake Lever Assembly
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Receives, multiplies, and transfers park brake system apply input force from driver to park brake cable system.
Releases applied park brake system when lever release button is depressed and lever is returned to the at rest position.
- Park Brake Cables
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Transfers input force received from park brake lever, through park brake cable equalizer, to park brake apply lever.
- Park Brake Cable Equalizer
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Evenly distributes input force to both the left and right park brake units.
Threaded front park brake cable adjuster is also used to remove slack in park brake cables.
- Park Brake Apply Lever
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Multiplies and transfers input force to park brake actuator/adjuster.
- Park Brake Actuator/Adjuster
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Uses multiplied input force from apply lever to expand drum brake shoes toward the friction surface of the brake drum.
Threaded park brake actuators/adjusters are also used to control clearance between the drum brake shoes and the friction surface of the brake drum.
- System Operation
-
Park brake apply input force is received by the park brake lever assembly being applied. The input force is multiplied by the lever assembly, transferred and evenly distributed, through the park brake cables and the park brake cable equalizer, to the left and right park brake apply levers. The park brake apply levers multiply and transfer the apply input force to the park brake actuators/adjusters which expand the drum brake shoes toward the friction surface of the brake drum in order to prevent the rotation of the rear tire and wheel assemblies. The park brake lever assembly releases an applied park brake system when it is released and returned to the at rest position.
Park Brake Hardware Inspection
Warning: Refer to Brake Dust Warning.
Visually inspect the park brake lever (1) and the lever pivot pin (2) for
the following conditions:
The lever being bent ...
Park Brake and P (Park) Mechanism Check
Warning: When you are doing this check, the vehicle could begin to
move. You or others could be injured and property could be damaged. Make sure
there is room in front of the vehicle in case ...
Other materials:
Headlamp Aiming
Visual Aiming Preparation Procedure
Note: Some state and local laws specify requirements for headlamp
aim. Comply with all of these laws when performing any headlamp aiming operations.
Headlamp aim should be checked:
When a new headlamp capsule is installed.
If ser ...
Rear Wheel Speed Sensor Replacement
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. Refer to Tire and Wheel Removal
and Installation.
Remove the rear wheel speed sensor ...
Battery Current Sensor Replacement
Removal Procedure
Disconnect the negative battery cable. Refer to Battery Negative Cable
Disconnection and Connection.
Disconnect the battery current sensor from the body harness connector.
Unclip the battery current sensor from the battery tray.
Remove the battery ...
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