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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 118 (Hydraulic Brake System) >> Diagnostic Information and Procedures >> Brakes Drag

Brakes Drag

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Brakes Drag

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 a drum-in-rotor type of park brake system? Go to Step 3  Go to Step 5 
3 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 4  Go to Step 5 
4
  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 12  Go to Step 5 
5 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 12  Go to Step 6 
6 Inspect the disc brake system for proper operation. Refer to Disc Brake System Diagnosis .
Did you find and correct a condition?		 Go to Step 12  Go to Step 7 
7
  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 9  Go to Step 8 
8 Replace the brake pedal assembly. Refer to Brake Pedal Assembly Replacement .
Did you complete the replacement?		 Go to Step 12  -
9
  1. Separate the master cylinder from the brake booster. Do not disconnect any brake pipes. Refer to Master Cylinder Replacement (JD9)  or Master Cylinder Replacement (JH6) .
  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 booster assembly. Refer to Power Brake Booster Replacement .
Did you complete the replacement?		 Go to Step 12  -
11 Inspect the hydraulic brake system for proper operation. Refer to Hydraulic Brake System Diagnosis .
Did you find and correct a condition?		 Go to Step 12  Go to Diagnostic Starting Point - Hydraulic Brakes 
12
  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
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