Anyone who knows me is aware I am slavishly beholden to the concept of picking up a book before picking up a wrench. Heck, that’s the cornerstone of Dorman’s own Training Center, and I’ve been preaching that for a long time. I’m not the only person beating that drum....

You know topping off brake fluid is generally a no-no, but when a customer’s brake fluid needs to be flushed completely, knowing what to put in the reservoir isn’t as clear-cut as it once was. The master cylinder cap may say the vehicle uses DOT 4 brake fluid, but are...