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 Side Door Adjustment (4 Door Notch Back 69)
Rear Side Door Adjustment
Callout
Component Name
1
Rear Side Door
Caution: Refer to Fastener Caution.
Procedure
Loosen the rear door hinge bolt?€‰(Qty:?€‰4) to adjust the rear
door.
A ...
Secondary Air Injection Check Valve Installation
Install a NEW secondary air injection check valve gasket (1).
Install the secondary air injection check valve (2).
Caution: Refer to Fastener Caution.
Install the 3 secondary air injection check valve bolts (3) and tighten
to 22 Y (16& ...
Fuel Tank Fuel Pump Module Replacement
Special Tools
EN-48279 Fuel Sender Lock Ring Tool
For equivalent regional tools, refer Special Tools.
Removal Procedure
Relieve the fuel system pressure. Refer to Fuel Pressure Relief
Remove the fuel tank. Refer to Fuel Tank Replacement.
Disconnect the electrical c ...
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