Brush And Brush Holder

Measure the brush length and replace if it exceeds the service limit.

Replace if abnormal wear or cracks are noticed.

Brush length: Standard 

15 mm (0.59 in) 

Service limit 

10 mm (0.39 in) 

Fig 1: Checking Brush Length

Courtesy of SUBARU OF AMERICA, INC.

Be sure brush moves smoothly inside brush holder.

Be sure there is no continuity between brush holder and its plate.

Fig 2: Checking Continuity Between Brush Holder And Plate

Courtesy of SUBARU OF AMERICA, INC.

Measure brush spring force with a spring scale. If it is less than the service limit, replace brush spring.

Brush spring force: Standard 

18.6 N (1.9 kgf, 4.2 lb) (when new) 

Service limit 

6.9 N (0.7 kgf, 1.5 lb)