Bench Testing: Brushes

WARNING: This page is about a different car, the 2002 Subaru Impreza, 2002 Subaru Forester, 2001 Subaru Impreza, and 2001 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Measure the length of each brush. See Fig 1 . If wear exceeds the service limit, replace the brush. Each has the service limit mark (A) on it.
Checking brush for proper pressure using a spring pressure indicator, push the brush into the brush holder until its tip protrudes .08" (2 mm). See Fig 2 . Then measure the pressure of brush spring.

Fig 1: Measuring Brush Length

Courtesy of SUBARU OF AMERICA, INC.

Fig 2: Checking Brush Spring Pressure

Courtesy of SUBARU OF AMERICA, INC.