Make sure that the carbon brush is fully inserted and kept straight. Before reconnecting the connector, it is usually secured first.|[Product Specifications] Carbon brush size is about 29mm long x 10mm wide x 6mm thick|The total length is about 75 mmx width 21 mm x thickness 10 mm|When you install them, make sure the carbon brushes are fully in and kept straight. It is normal to need to secure the connectors before reseating them.|Carbon brushes are usually called wear parts and are usually replaced due to friction during daily use of the motor.|These carbon brushes ensure the normal operation of your motor and repair motors that run intermittently.