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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 fluid level is low not related to lining wear.
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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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1.
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Inspect the following hydraulic brake system components for brake fluid leaks:
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•
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Flexible brake hose connections; threaded and bolted
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•
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Flexible brake hose crimp joints
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•
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Wheel cylinder piston seals, if equipped
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•
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Master cylinder reservoir
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•
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Master cylinder reservoir low pressure hose, if equipped
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•
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Brake pressure modulator valve (BPMV) assembly, if equipped
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Did you find and correct a condition?
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Go to
Step 8
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Go to
Step 3
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3
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Is the vehicle equipped with a vacuum brake booster?
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Go to
Step 4
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Go to
Step 6
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4
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1.
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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 vacuum brake booster. Do not disconnect any brake pipes.
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3.
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Inspect the rear of the master cylinder for a brake fluid leak.
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4.
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Inspect for brake fluid in the vacuum brake booster.
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Did you find a brake fluid leak?
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Go to
Step 5
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Go to
Diagnostic Starting Point - Vehicle
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5
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Replace the brake master cylinder and the vacuum brake booster.
Did you complete the replacement?
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Go to
Step 8
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-
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6
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1.
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Wipe clean the external surface of the master cylinder to hydraulic brake booster area, if equipped.
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2.
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Separate the master cylinder from the hydraulic brake booster, if equipped. Do not disconnect any brake pipes.
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3.
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Inspect the rear of the master cylinder for a brake fluid leak.
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Did you find a brake fluid leak?
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Go to
Step 7
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Go to
Diagnostic Starting Point - Vehicle
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7
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Replace the brake master cylinder.
Did you complete the replacement?
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Go to
Step 8
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-
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8
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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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