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. Refer to 
Master Cylinder Overhaul 
. |