System Component Description
| Callout | Component Name |
|---|---|
| B19B | B19B Brake Booster Vacuum Sensor |
| K17 | K17 Electronic Brake Control Module |
| M9 | M9 Brake Booster Pump Motor |
The brake booster vacuum assist system consists of the following:
- Brake Booster Auxiliary Vacuum Pump (electric or mechanical)
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The brake booster vacuum pump is a secondary vacuum supply to the brake booster used to maintain sufficient vacuum for brake assist.
- Brake Booster Vacuum Sensor
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The vacuum sensor is used to measure the level of vacuum available in the brake booster. The electronic brake control module supplies a 5 V reference and a low reference circuit to the brake booster vacuum sensor. The vacuum sensor is located in the brake booster or vacuum hose. The brake booster vacuum sensor supplies a voltage signal in relation to the pressure in the brake booster to the electronic brake control module.
- Electronic Brake Control Module
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The electronic brake control module monitors the vacuum in the brake booster using the brake booster vacuum sensor. When the vacuum within the system drops the electronic brake control module turns ON the brake booster auxiliary vacuum pump.
- Vacuum Brake Booster
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When brake system input force is applied, air at atmospheric pressure is admitted to the rear of both vacuum diaphragms, providing a decrease in brake pedal effort required. When input force is removed, vacuum replaces the atmospheric pressure within the booster. The booster uses source vacuum to decrease the effort required by driver when applying the brake.
- Vacuum Source
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Vacuum is supplied by the engine vacuum or by the brake booster auxiliary vacuum pump (electric or mechanical).