Chevrolet Sonic Repair Manual: Park Brake System Description and Operation
- System Component Description
-
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
-
Transfers input force received from park brake lever, through park brake cable equalizer, to park brake apply lever.
- Park Brake Cable Equalizer
-
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
-
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:
Automatic Door Locks
The vehicle is programmed so that when the doors are closed, the ignition is
on, and the shift lever is moved out of P (Park) for automatic transmissions, or
when the vehicle speed is above 13 km/h (8 mph) for manual transmissions, the doors
and the trunk/liftgate will lock.
To unlock the doo ...
Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant
Pipe Joint Compound
Note: Three types of sealer are commonly used in engines. These
are RTV sealer, anaerobic gasket eliminator sealer, and pipe joint compound.
The correct sealer and amount must be used in the proper location to prevent
oil leaks. DO NOT interchange the 3&# ...
Range Selector Lever Cable Replacement
Removal Procedure
Set the park brake and chock the wheels.
Disconnect the transmission range selector lever cable
terminal (1) from the transmission manual shift lever pin.
Press the locking tabs inward in order to release
the transmission range selector lev ...
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