Master Cylinder Diagnosis. Buick GL7 (Export) 2000

For 1990-2009 cars

1. Inspect for master cylinder housing cracks. If the master cylinder is cracked, replace the master cylinder. Refer to Master Cylinder Reservoir Replacement .

Important: A damp condition around the master cylinder is considered normal.

2. Inspect for brake fluid leaks around the master cylinder.

If the brake fluid has accumulated to form a drop of BRAKE fluid on the bottom of the master cylinder, repair or replace the master cylinder. Refer to Master Cylinder Overhaul or Master Cylinder Reservoir Replacement .

3. Inspect the brake fluid reservoir cap seal. If the brake fluid reservoir cap seal is swollen, perform the following steps:

3.1. | Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .

| Important: Replace all of the brake system components that have internal rubber components that cannot be serviced.

3.2. | Replace all of the brake system rubber components.

3.3. | Flush the hydraulic brake system again. Refer to Hydraulic Brake System Flushing .