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Brake Fluid Loss

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Were you sent here from SYMPTOMS - HYDRAULIC BRAKES  under TROUBLE SHOOTING? If so, go to the next step. If not, go to STARTING POINT - HYDRAULIC BRAKES  under TROUBLE SHOOTING.
  2. Inspect the hydraulic brake system for proper operation. See HYDRAULIC BRAKE SYSTEM DIAGNOSIS  under SYSTEM TESTS. Did you find and correct a condition? If so, go to step  7. If not, go to the next step.
  3. Inspect the disc brake system for proper operation. See DISC BRAKE SYSTEM DIAGNOSIS  under SYSTEM TESTS. Did you find and correct a condition? If so, go to step  7. If not, go to the next step.
  4. Inspect the drum brake system, if equipped, for proper operation. See DRUM BRAKE SYSTEM DIAGNOSIS  under SYSTEM TESTS. Did you find and correct a condition? If so, go to step  7. If not, go to STARTING POINT - HYDRAULIC BRAKES  under TROUBLE SHOOTING.
  5. Separate the master cylinder from the vacuum brake booster. Do not disconnect any brake pipes. See MASTER CYLINDER  under REMOVAL & INSTALLATION. Inspect the rear of the master cylinder for a brake fluid leak. Inspect for brake fluid in the vacuum brake booster. Did you find a brake fluid leak? If so, go to next step. If not see STARTING POINT - HYDRAULIC BRAKES  under TROUBLE SHOOTING.
  6. Replace the brake master cylinder and the vacuum brake booster. See MASTER CYLINDER  and VACUUM BRAKE BOOSTER  under REMOVAL & INSTALLATION. After repairs are complete, go to next step.
  7. Road test the vehicle to confirm proper operation. See BRAKE SYSTEM VEHICLE ROAD TEST  under TROUBLE SHOOTING. Is the condition still present? If so, go to step  2. If not, the system is okay.
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