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Home >> Hummer >> 2007 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 1349 (Anti-Lock Brake System - Non-Hybrid Less Than 3900 Kg (8600 Lb) GVW With TCS & VSES) >> Description and Operation >> ABS Description and Operation (W JD9) >> Active Vacuum Booster

Active Vacuum Booster

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The power brake booster assist unit creates mechanical force for the brake booster in case of a vacuum loss or low vacuum to the brake booster. The power brake booster system consists of:

The Power Brake Booster is solenoid operated, and applies a mechanical force to brake master cylinder push rod to aid in brake pedal effort.

The Brake Booster Vacuum Sensor is a input to EBCM, and operates the ABS pump motor to precharge the brake system.

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