TM 10-3930-659-20 16-2. DEFROSTER BLOWER MOTOR MAINTENANCE (Con't). b. BRUSH REPLACEMENT NOTE Brushes should be replaced In a matched set even if only one brush Is damaged. 1. Remove  two  caps  (9)  and  brushes  (10)  from defroster blower motor (11). 2. Install two brushes (10) and caps (9) on defroster blower motor (11). TA706967 16-4