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
-
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
-
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:
Checking Coolant
The vehicle must be on a level surface when checking the coolant level.
It is normal to see coolant moving in the upper coolant hose return line when
the engine is running.
Check to see if coolant is visible in the coolant surge tank. If the coolant
inside the coolant surge tank is boiling, do ...
Electronic Brake Control Module Programming and Setup
Note:
DO NOT program a control module unless directed to by a service procedure
or a service bulletin. If the ECU is not properly configured with the correct
calibration software, the ECU will not control all of the vehicle features
properly.
Ensure the programming tool is ...
Air Cleaner Inlet Duct Replacement
Removal Procedure
Remove the right front wheelhouse liner. Refer to Front Wheelhouse Liner
Replacement.
Remove the upper intake air duct plastic fastener (1).
Pull the lower portion of the intake air duct outward to release the
duct from the rub ...
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