TM 10-3930-659-20 Table 4-1.  Mechanical Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 27.  PARKING BRAKE WILL NOT APPLY. Step 1. Inspect parking brake cable for proper adjustment (see paragraph 10-2) or damage. Adjust parking brake (see paragraph 10-2). Replace damaged parking brake cable (see paragraph 10-4). Step 2. Inspect brakedrum and brakeshoes for wear and damage. Remove parking brake assembly and replace worn or damaged parts (see paragraph 10-1). 28.  PARKING BRAKE INDICATOR LIGHT WILL NOT LIGHT WHEN PARKING BRAKE IS APPLIED. Step 1. Inspect parking brake light switch for proper adjustment (see paragraph 6-55). Adjust parking brake light switch (see paragraph 6-55). Step 2. Inspect parking brake light switch and wiring for damage. Replace damaged parking brake light switch (see paragraph 6-55). Replace damaged fault monitor and dash wiring harness (see paragraph 6-14). 4-20