Lumina V6-3.8L VIN K (1998)
Brake Master Cylinder: Testing and Inspection
The following checks will help locate master cylinder malfunctions. Use the Brake Diagnosis Charts in "Brake System Diagnosis" in Hydraulic System
/Testing and Inspection in order to help isolate the problem if the problem is not found through the following tests. See: Testing and Inspection
1. Inspect for a cracked master cylinder casting.
2. Inspect for brake fluid around the master cylinder. A leak is present if there is at least one drop of fluid. A damp condition is not abnormal.
3. Inspect for binding pedal linkage.
4. If the pedal linkage and the pushrod length are correct, remove the master cylinder reservoir cap and check for a distorted or swollen diaphragm.
5. If a swollen diaphragm is found, substandard or contaminated brake fluid is the probable cause. If the fluid if contaminated, use the following
procedure:
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Disassemble and clean the serviceable components.
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Replace all of the non-serviceable components.
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Flush all of the pipes and the brake hoses.