Bench Testing: Brushes

WARNING: This page is about a different car, the 2004 Lexus IS 300, 2003 Lexus IS 300, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

Using a vernier caliper, measure brush length. See STARTER SPECIFICATIONS . If brush length is less than minimum specification, replace brush holder and field frame.
Using a pull scale, note brush spring tension the instant the brush spring separates from brush. See STARTER SPECIFICATIONS . If brush spring tension is less than minimum specification, replace brush springs.