Brake Fluid Loss: 2003
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, and 2003 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Were you sent here from SYMPTOM LIST under GENERAL DIAGNOSIS in TROUBLE SHOOTING? If so, go to next step. If not, see HYDRAULIC BRAKE SYSTEM under DIAGNOSTIC STARTING POINTS in TROUBLE SHOOTING.
- Inspect the hydraulic brake system for proper operation. See HYDRAULIC BRAKE SYSTEM DIAGNOSIS under TROUBLE SHOOTING. Did you find and correct a condition? If so, go to step 7. If not, go to next step.
- Inspect the disc brake system for proper operation. See DISC BRAKE SYSTEM DIAGNOSIS under TROUBLE SHOOTING. Did you find and correct a condition? If so, go to step 7. If not, go to next step.
- Is the vehicle equipped with vacuum assist brakes? If so, go to next step. If not, see HYDRAULIC BRAKE SYSTEM under DIAGNOSTIC STARTING POINTS under TROUBLE SHOOTING.
- 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 HYDRAULIC BRAKE SYSTEM under DIAGNOSTIC STARTING POINTS in TROUBLE SHOOTING.
- Replace the brake master cylinder and the vacuum brake booster. See MASTER CYLINDER or VACUUM BRAKE BOOSTER under REMOVAL & INSTALLATION. When complete, go to next step.
- Road test the vehicle to confirm proper operation. See BRAKE SYSTEM VEHICLE ROAD TEST under SYSTEM TESTS. Is the condition still present? If so, go to step 2. If not, system is okay.