For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Were you sent here from the Hydraulic Brake Symptom table? | Go to Step 2 | Go to Diagnostic Starting Point - Hydraulic Brakes
2 | Is the vehicle equipped with an adjustable stop lamp switch and/or an adjustable cruise control release switch? | Go to Step 3 | Go to Step 4
3 |

1. Inspect the stop lamp switch for proper adjustment to ensure that the brake pedal is fully releasing.
2. Inspect the cruise control release switch, if equipped, for proper adjustment to ensure that the brake pedal is fully releasing.

Did you find and correct a condition?

Go to Step 14

Go to Step 4

4 | Is the vehicle equipped with a drum-in-rotor type of park brake system? | Go to Step 5 | Go to Step 7
5 | Ensure the park brake shoes are not adjusted too tightly, possibly causing drag under certain conditions. Are the park brake shoes adjusted too tightly? | Go to Step 6 | Go to Step 7
6 |

1. Clean and inspect the park brake shoes for excessive wear and/or damage.
2. Inspect the drum portion of the rotors for excessive wear, blueing discoloration, heat spots, and excessive radial runout.
3. If any of these conditions are present, replace the affected components.
4. Adjust the park brake system.

Did you find and correct a condition?

Go to Step 14

Go to Step 7

7 | Inspect the park brake system for proper operation. Refer to Park Brake System Diagnosis . Did you find and correct a condition? | Go to Step 14 | Go to Step 8
8 | Inspect the disc brake system for proper operation. Refer to Disc Brake System Diagnosis . Did you find and correct a condition? | Go to Step 14 | Go to Step 9
9 |

1. Separate the brake booster pushrod from the brake pedal.
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 11

Go to Step 10

10 | Replace the brake pedal assembly. Did you complete the replacement? | Go to Step 14 | --
11 |

1. Separate the master cylinder from the brake booster. Do not disconnect any brake pipes.
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 13

Go to Step 12

12 | Replace the brake booster assembly. Did you complete the replacement? | Go to Step 14 | --
13 | Inspect the hydraulic brake system for proper operation. Refer to Hydraulic Brake System Diagnosis . Did you find and correct a condition? | Go to Step 14 | Go to Diagnostic Starting Point - Hydraulic Brakes
14 |

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

Is the condition still present?

Go to Step 2

System OK