I watch my tester doing the brake test because I want to see the side to side performance in case there's a noticeable difference. The fronts are first done together, then individually. The rears would be the same but not with an LSD, they need to be done together. The handbrake is then pulled. It's interesting to watch the lights cascade along the measure. They are never bang on, but normally not very far apart. A sticking piston or cylinder is obvious.
