Brush And Brush Holder

1. Visually check the brush. If there is any abnormal wear or cracks, replace the brush.
2. Measure the length of the brush. If it exceeds service limits, replace the brush.

   Brush length: 

   Standard 

   12.3 mm (0.484 in)

   Limit 

   7.0 mm (0.276 in)

   Fig 1: Identifying Brush And Service Limit Line

   Courtesy of SUBARU OF AMERICA, INC.
3. Check that the brush moves smoothly in the brush holder.
4. Measure the brush spring force with a spring scale. Replace the brush holder if below the service limit.

Brush spring force: 

Standard 

15.9 - 19.5 N (1.62 - 1.99 kgf, 3.57 - 4.38 lbf) (when new)

Limit 

2.5 N (0.25 kgf, 0.56 lbf)