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Home >> GMC >> 2002 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brakes >> Description & Operation >> Brake Assist System Description & Operation (Vacuum Assist) >> System Operation

System Operation

Brake system input force is multiplied by the brake pedal and transferred by the pedal pushrod to the hydraulic brake master cylinder. Effort required to apply the brake system is reduced by the vacuum brake booster.