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Starting System & Charging System: Generator: Inspection: Brush

  1. Measure the length of each brush. Replace the brush if wear exceeds service limits. There is a service limit mark (A) on each brush.

    Brush length: 

    Standard (1) 

    22.5 mm (0.886 in) 

    Limit (2) 

    5.0 mm (0.197 in) 

    Fig 1: Identifying Brush Length
    G06648715Courtesy of SUBARU OF AMERICA, INC.
  2. 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 1.7 N (173 gf, 6.11 ozf) or less, replace the brush spring. 4.1 - 5.3 N (418 - 540 gf, 14.75 - 19.06 ozf) pressure is required on the new spring.
    Fig 2: Measuring Pressure Of Brush Spring
    G06648716Courtesy of SUBARU OF AMERICA, INC.