I just got through replacing my front brakes, rotors, calipers, etc (and the rear brakes) because the lanyard pulled out of the switch while driving over the Grapevine to Burbank. I don't know when the event happened I may have run over something and through it into the line but I never felt anything while driving the DP motorhome. The front brakes got so hot that the spoke wheels were discolored...brake fluid was everywhere. I'm now skittish about using it although I know I should and will use it again, I just need to give this event some time. I also believe it is the law in California if you are towing a car behind a MH.