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Step
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Action
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Yes
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No
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DEFINITION: Brake system does not fully release or has delayed release; vehicle motion may be hindered by brake system without applying brakes.
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1
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Were you sent here from the Hydraulic Brake Symptom table?
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Go to
Step 2
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Go to
Diagnostic Starting Point - Vehicle
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2
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Is the vehicle equipped with an adjustable stop lamp switch and/or an adjustable cruise control release switch?
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Go to
Step 3
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Go to
Step 4
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3
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1.
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Inspect the stop lamp switch for proper adjustment to ensure that the brake pedal is fully releasing.
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2.
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Inspect the cruise control release switch, if equipped, for proper adjustment to ensure that the brake pedal is fully releasing.
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Did you find and correct a condition?
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Go to
Step 14
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Go to
Step 4
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4
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Is the vehicle equipped with a drum-in-rotor type of park brake system?
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Go to
Step 5
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Go to
Step 7
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5
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Ensure the park brake shoes are not adjusted too tightly, possibly causing drag under certain conditions.
Are the park brake shoes adjusted too tightly?
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Go to
Step 6
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Go to
Step 7
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6
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1.
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Clean and inspect the park brake shoes for excessive wear and/or damage.
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2.
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Inspect the drum portion of the rotors for excessive wear, blueing discoloration and heat spots.
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3.
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If any of these conditions are present, replace the affected components.
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4.
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Adjust the park brake system.
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Did you find and correct a condition?
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Go to
Step 14
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Go to
Step 7
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7
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Inspect the park brake system for proper operation. Refer to
Park Brake System Diagnosis
.
Did you find and correct a condition?
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Go to
Step 14
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Go to
Step 8
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8
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1.
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Inspect the disc brake system for the following conditions:
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•
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Binding, incorrectly installed or missing caliper hardware and/or lining hardware-Ensure free movement of linings and of caliper, if equipped with sliding type caliper
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•
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Lack of lubrication or excessive corrosion on metal to metal contact surfaces
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•
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Distorted or damaged linings
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•
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Damaged or excessively worn caliper hardware and/or lining hardware
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•
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Bent or damaged caliper or mounting component
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Did you find and correct a condition?
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Go to
Step 14
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Go to
Step 9
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9
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1.
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Separate the brake booster pushrod from the brake pedal.
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2.
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Inspect the brake corners to determine if the brake drag condition is still present.
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Do the brake corners still exhibit the brake drag condition?
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Go to
Step 11
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Go to
Step 10
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10
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1.
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Inspect the pushrod for improper positioning and/or damage. Correctly position or replace the pushrod if necessary.
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2.
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Inspect the brake pedal assembly for damage and replace if necessary.
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Did you complete the repair or replacement?
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Go to
Step 14
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-
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11
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1.
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For vacuum boost systems, disconnect the vacuum check valve from the booster to relieve vacuum reserve.
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2.
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Separate the master cylinder from the brake booster. Do not disconnect any brake pipes.
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3.
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Inspect the brake corners to determine if the brake drag condition is still present.
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Do the brake corners still exhibit the brake drag condition?
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Go to
Step 13
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Go to
Step 12
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12
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Replace the brake booster assembly.
Did you complete the replacement?
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Go to
Step 14
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-
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13
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1.
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Inspect the hydraulic brake system for the following conditions.
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•
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Improper operation of caliper pistons
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•
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Contaminated brake fluid
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•
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Internally damaged flexible brake hoses; hindering brake release
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•
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Damaged or improperly operating master cylinder
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Did you find and correct a condition?
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Go to
Step 14
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Go to
Diagnostic Starting Point - Vehicle
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14
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1.
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Install or connect components that were removed or disconnected during diagnosis.
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Is the condition still present?
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Go to
Step 2
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System OK
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