When a vehicle comes into a shop with a low or spongy brake pedal, what is your first thought? Chances are you automatically assume the problem is in the hydraulic system, such as a faulty master cylinder, a leak in the brake lines or a bad caliper.
The cause of a spongy or low pedal doesn’t always lie in the hydraulic system. Before assuming a “low brake pedal” is the fault of the hydraulic system, do a thorough brake inspection checklist. As part of that checklist, make sure to check the play in the wheel bearings. If you find significant play in the bearing, that could very well be the cause of a "low brake pedal" symptom.