Brake monitoring system

A method of monitoring a braking system comprising, but not necessarily in the order shown:

• A) braking a towing vehicle;
• B) activating a braking system in a towed vehicle;
• C) sensing a parameter of the braking system in the towed vehicle or a parameter of the towed vehicle;
• D) transmitting a message about the parameter from a transmitter located in the towed vehicle;
• E) receiving the message on a receiver located in the towing vehicle;
• and
• F) displaying the message to an occupant of the towing vehicle.

A device for monitoring a supplemental braking system comprising:

• A) supplemental braking means for decelerating a towed vehicle;
• B) detector means for detecting at least one operating parameter of the towed vehicle or of the supplemental braking means;
• C) processor means for receiving the operating parameter and generating a message related to the operating parameter;
• D) transmitter means for transmitting a signal containing the message;
• E) receiver means for receiving the signal from the transmitter means;
• and
• F) display means for communicating the message to an occupant of the towing vehicle.