Thanks for the info Magic. the brake switches are optical, one for the emergency brake and the other for the standard brake. tried purchasing a new kit from Unitec, but they insist on selling me the complete brake system for over 15K "CRAZY". I adjusted them to approximately a 16th away. would you know if it's possible to bypass these switches temporarily for testing? as the problem is happening every couple of hours now. Brake relays have already been replaced.