TM 10-3930-659-20 6-36. LOW BRAKE PRESSURE SWITCH REPLACEMENT (Con’t). 3. Disconnect two under cab wiring harness connectors (6) from low brake pressure switch (5). 4. Remove low brake pressure switch (5 from left brake valve m. b. INSTALLATION 1. Install low brake pressure switch (5) on left brake valve (7). 2. Connect two under cab wiring harness connectors (6) to low brake pressure switch (5). FOLLOW-ON TASKS: • Install left side cab skirt (see paragraph 14-6). TA707821 6-137