Were you sent here from the Hydraulic Brake Symptom table?

Go to Step 2

Go to Diagnostic Starting Point - Hydraulic Brakes

1. Inspect the stop lamp switch for proper adjustment to ensure that the brake pedal is fully releasing. Refer to Stop Lamp Switch Adjustment in Lighting Systems.
2. Inspect the torque converter clutch (TCC)/ cruise control release switch, for proper adjustment to ensure that the brake pedal is fully releasing. Refer to Torque Converter Clutch/Cruise Control Release Switch Adjustment in Automatic Transaxle - 4T80-E.

Did you find and correct a condition?

Go to Step 10

Go to Step 3

Inspect the park brake system for proper operation. Refer to Park Brake System Diagnosis in Park Brake.

Did you find and correct a condition?

Go to Step 10

Go to Step 4

Inspect the disc brake system for proper operation. Refer to Disc Brake System Diagnosis .

Did you find and correct a condition?

Go to Step 10

Go to Step 5

1. Separate the brake booster pushrod from the brake pedal. Refer to Brake Pedal Assembly Replacement .
2. Inspect the brake corners to determine if the brake drag condition is still present.

Do the brake corners still exhibit the brake drag condition?

Go to Step 7

Go to Step 6

Replace the brake pedal assembly. Refer to Brake Pedal Assembly Replacement .

Did you complete the replacement?

Go to Step 10

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1. Separate the master cylinder from the brake booster. Do not disconnect any brake pipes. Refer to Master Cylinder Replacement .
2. Inspect the brake corners to determine if the brake drag condition is still present.

Do the brake corners still exhibit the brake drag condition?

Go to Step 9

Go to Step 8

Replace the brake booster assembly. Refer to Power Vacuum Brake Booster Replacement or Power Brake Booster Replacement .

Did you complete the replacement?

Go to Step 10

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Inspect the hydraulic brake system for proper operation. Refer to Hydraulic Brake System Diagnosis .

Did you find and correct a condition?

Go to Step 10

Go to Diagnostic Starting Point - Hydraulic Brakes

1. Install or connect components that were removed or disconnected during diagnosis.
2. Road test the vehicle to confirm proper operation. Refer to Brake System Vehicle Road Test .

Is the condition still present?

Go to Step 2

System OK