Section 14 (Starting/Charging Systems (H4SO)): Generator: Inspection: Brush

WARNING: This page is about a different car, the 2005 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.

Measure the length of each brush. If wear exceeds the service limit, replace the brush. Each brush has the service limit mark (A) on it.
Brush length:

Standard

18.5 mm (0.728 in)

Service limit

5.0 mm (0.197 in)

Fig 1: Identifying Brush Length
Courtesy of SUBARU OF AMERICA, INC.
Checking brush spring for proper pressure
Using a spring pressure indicator, push the brush into the brush holder until its tip protrudes 2 mm (0.08 in). Then measure the pressure of brush spring. If the pressure is less than 2.2 N (224 g, 7.91 oz), replace the brush spring with a new one. The new spring must have a pressure of 4.8 to 6.0 N (489 to 612 g, 17.26 to 21.60 oz).

Fig 2: Checking Brush Spring Pressure Using Spring Pressure Indicator
Courtesy of SUBARU OF AMERICA, INC.