Currently, Indonesia's manufacturing sector is expanding at a respectable rate. This encourages business owners to focus on the quality of their products. Good production standards will result in high-quality items. A consumer-satisfying product can enhance the company's sales. This study was conducted in a plant that has produced brake linings exclusively since 2002. Cracks and bloating faults are still present on the surface of the brake linings at this manufacturer; therefore, changes are necessary. The goal of this study was to identify the types of defects, quantify the degree of faults, identify and analyze the variables generating defects, and make recommendations for improving the quality of the company's brake lining manufacture. As evaluated by the sigma value, the current production quality of the Non-Asbestos 2 (NA2) type brake lining is 3.93 sigma. Utilizing the phases of define, measure, analysis, improve, and control, six sigmas’ is employed (DMAIC). This study's outcomes include proposed enhancements and comparisons of sigma values before and after implementation. The conclusion of this study is that there are two types of defects, namely cracks and bloating, resulting from of a number of factors. Standard operating procedures (SOP), checklists, standard forms for measuring raw materials, and investment in more advanced machines are proposed as means of improvement. The implementation findings yielded a sigma value of 4.59 (an increase of 0.66 sigma from before).