1. Product Positioning

• Replacement carbon brushes for Bosch GSB140-LI, GSB180-LI, GSR140-LI, and GSR180-LI hand electric drills.

• Key wear-and-tear spare parts for motor current conduction systems.

2. Compatibility Details

• Applicable Models:

• GSB140-LI / GSB180-LI (impact drill series)

• GSR140-LI / GSR180-LI (rotary drill series)

• Functional Role: Transmits current to the rotor via contact with the commutator, enabling motor rotation.

3. Technical Specifications

• Material: Graphite-copper composite (10–15% copper content) for balanced conductivity and wear resistance.

• Typical Dimensions:

• Thickness: 6mm × Width: 9mm × Length: 12mm (subject to model-specific verification).

• Working Parameters:

• Spring pressure: 1.2–1.8kg

• Service life: ~50–80 hours of operation

4. Replacement Indicators

• Carbon brush length < 1/2 of original size.

• Abnormal sparking, reduced drilling power, or motor startup delays.

• Visible wear on the commutator surface (grooves > 0.3mm).

5. Installation Steps

1. Power off and detach the drill's rear cover.

2. Remove the old carbon brush and spring assembly.

3. Clean the commutator with alcohol and inspect for damage.

4. Polish the new brush arc to fit the commutator curvature.

5. Install the spring and ensure consistent pressure (recommend using a spring scale).

6. Maintenance Tips

• Check brush wear every 30 hours of use.

• Replace carbon brushes and springs as a set for optimal performance.

• Avoid operating the drill with worn brushes to prevent commutator damage.