Master Cylinder Diagnosis

These tests will not find all master cylinder malfunctions. If the cause is not found with these tests, refer to Hydraulic Brake Diagnostic System Check
^ Check for a cracked casting or brake fluid leaks around the master cylinder. A leak will have at least one drop of fluid. A damp condition is normal.
^ Check the pedal linkage for binding and for incorrect pushrod length.
^ Disassemble the master cylinder if there is improper brake pedal travel or brake pedal binding.
^ Check the master cylinder for swollen or elongated primary piston seals. If you find swollen seals, refer to Brake Fluid and Brake Fluid Handling.