TM 10-3930-669-10 Table 3-2.  Operator Troubleshooting Procedures - CONT. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION BRAKE SYSTEM (CONT) 3. PARKING BRAKE DOES NOT RELEASE OR ENGAGE. Adjust manual adjusting knob on parking brake lever and check parking brake (Para 3-10). If parking brake does not release, notify Unit Maintenance. If parking brake does not engage, notify unit Maintenance. WHEELS 1. WHEEL(S) WOBBLE. Step 1.  Check wheel for loose, missing, or broken lugnuts. If lugnuts are loose, missing, or broken, notify Unit Maintenance. If lugnuts are OK, go to step 2. Step 2.  Check wheels for visible damage. If wheel(s) are damaged, notify Unit Maintenance. If wheels are OK, go to Steering System troubleshooting fault 2. 3-9