GM Service Manual Online
For 1990-2009 cars only
  1. Inspect the master cylinder for a cracked casting.
  2. Inspect the master cylinder for brake fluid leads. Leaks are indicated only if there is at least one drop of fluid. A damp condition is not abnormal.
  3. Inspect the master cylinder for the following conditions:
  4. • Binding pedal linkage
    • Incorrect pushrod length
  5. Disassemble the master cylinder if you did not find a condition.
  6. Inspect the master cylinder for swollen or elongated primary piston seals.