Brush and brush holder

Fig 1: Checking Continuity Between Insulated Brush And Plate Using Tester

Courtesy of MAZDA MOTORS CORP.

• If there is continuity, replace the brush holder.

Fig 2: Measuring Brush Length

Courtesy of MAZDA MOTORS CORP.

• If any brush is worn almost to or beyond the minimum specification, replace all of the brushes.

Starter brush length 

• Standard: 12.3 mm {0.484 in}
• Minimum: 5.5 mm {0.22 in}

Fig 3: Measuring Brush Spring Force Using Spring Balance

Courtesy of MAZDA MOTORS CORP.

• If not within the minimum specification, replace the brush and brush holder component.

Starter brush spring force 

• Standard: 15.0-20.4 N {1.53-2.08 kgf, 3.38-4.58 lbf}
• Minimum: 2.75 N {0.280 kgf, 0.618 lbf}