Chevrolet Sonic Repair Manual: Brake Assist System Description and Operation
- System Component Description
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The brake assist system consists of the following:
- Brake Pedal
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Receives, multiplies and transfers brake system input force from driver.
- Brake Pedal Pushrod
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Transfers multiplied input force received from the brake pedal to the vacuum brake booster.
- Vacuum Brake Booster
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Uses source vacuum to decrease effort required by driver when applying brake system input force. At rest, source vacuum is applied to both sides of the vacuum diaphragm for single booster. Return springs maintain the booster in a rest position. When brake system input force is applied, vacuum to the rear of the diaphragm is cut off, and air at atmospheric pressure is admitted in its place. This provides a decrease in brake pedal effort required. When input force is removed, vacuum again replaces atmospheric pressure within the booster.
- Vacuum Source
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Supplies force used by vacuum brake booster to decrease brake pedal effort. The source vacuum for a spark ignition engine is normally derived from the intake manifold.
- Vacuum Source Delivery System
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Enables delivery and retention of source vacuum for vacuum brake booster.
- System Operation
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Under normal driving conditions, without the brakes applied, vacuum is allowed to act on both sides of the diaphragm within the vacuum brake booster. When the brake pedal is applied, the effort by the driver is multiplied due to the relative length of the brake pedal in relationship to its pivot point and the point at which the push rod to the vacuum brake booster is attached.
Movement of the push rod causes a valve within the vacuum brake booster to close between the two sides of the diaphragm, thus isolating each side. It also allows a valve to open that allows atmospheric pressure to act on the pedal side of the vacuum brake booster while maintaining vacuum on the vacuum source side of the diaphragm. The movement of the brake pedal pushrod is transferred to the hydraulic brake master cylinder via the vacuum brake booster. The pressure differential within the vacuum brake booster reduces the effort required by the driver in applying the brakes.
General
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Brake Dust Warning
Warning: Avoid taking the following actions when you service wheel
brake parts:
Do not grind brake linings.
Do not sand brake linings.
Do not clean wheel brake parts with a dry brus ...
Other materials:
Rear Bumper Impact Bar Replacement (Hatchback)
Rear Bumper Impact Bar Replacement
Callout
Component Name
Preliminary Procedure
Remove the rear bumper fascia. Refer to Rear Bumper Fascia Replacement.
1
Rear Bumper Impact Bar Bolt (Qty:?€‰4 ...
Rear Wheelhouse Liner Replacement (Sedan - Left)
Rear Wheelhouse Liner Replacement
Callout
Component Name
Preliminary Procedure
Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and
Installation.
1
Rear Wheelhouse Panel Liner ...
Sunroof Description and Operation (Tilt and Slide)
The Tilt/Slide sunroof consists of a moving glass panel and a manual sunshade.
In the Tilt/Slide sunroof system the rear of the glass tilts up above the roof line
for venting, and slides between the headliner and the roof panel to open fully.
The sunshade is operated by manually pushing or pu ...
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