TM 10-3930-659-20 6-55. PARKING BRAKE LIGHT SWITCH REPLACEMENT. This task covers: a. Removal c. Adjustment b. Installation Initial Setup Equipment Conditions: Materials/Parts: • Battery disconnect switch in OFF position • Two locknuts (see TM 10-3930-659-10). • Parking brake set (see TM 10-3930-659-10). References: Tools/Test Equipment: • TM 10-3930-659-10 • General mechanic's tool kit (Item 44, Appendix F) a. REMOVAL 1. Remove two locknuts (2), screws (6), parking brake light switch (1), and spacer (8) from bracket (7).  Discard locknuts. 2. Gently pull down parking brake light switch (1), and remove two screws (5) and under cab wiring harness terminal leads (3) from parking brake light switch. b. INSTALLATION 1. Install two under cab wiring harness terminal leads (3) on parking brake light switch (1) with two screws (5). 2. Install spacer (8) and parking brake light switch (1) on bracket (7) with two screws (6) and new locknuts (2). c. ADJUSTMENT 1. Loosen two screws (5). NOTE Parking brake light switch contacts must open when parking brake pedal Is engaged In first notch.  Parking brake light switch Indicator will light and transmission will disengage when parking brake light switch contacts are opened.  Parking brake light switch contacts must close when parking brake Is released. 2. Position parking brake light switch (1) so contacts are opened when parking brake pedal (4) is engaged in first notch and contacts are closed when parking brake Is released. 3. Tighten two screws (6). 4. Check that parking brake light switch indicator lights when parking brake pedal (4) is engaged in first notch. 6-178