California Code
ARTICLE 13.5 - Motor Vehicle Brake Friction Materials
Section 25250.52.

25250.52. On and after January 1, 2021, any motor vehicle brake friction materials exceeding 5 percent copper by weight shall not be sold in this state, except as otherwise provided in this article.

(Added by Stats. 2010, Ch. 307, Sec. 2. (SB 346) Effective January 1, 2011.)