Trailer brake system

A brake system for a towing vehicle and a trailer, comprising, in combination, a towing vehicle brake system, actuator means for selectively operating the towing vehicle brake system, transducer means connected to the actuator means for developing an electrical signal which varies proportionately to towing vehicle brake system actuation, a trailer fluid brake system and an electromechanical fluid power control electrically connected to the transducer means and mechanically connected to the trailer fluid brake system for varying the trailer brake system fluid pressure and consequent trailer brake system braking action proportionately to the electrical signal, said power control including a power booster having an unported diaphragm between two fluid power chamber defined within the power booster, a diaphragm interconnector interposed between the diaphragm and said trailer fluid brake system, and valve means responsive to said electrical signal for altering pressure in one of the power booster chambers so as to move the diaphragm and vary the trailer brake system braking action accordingly.

A brake system for towing vehicle and trailer, comprising a towing vehicle brake system, an electromechanical transducer connected to the towing vehicle brake system for developing an electrical signal which varies proportionately and systematically in accordance with braking action experienced in the towing vehicle brake system, a trailer fluid brake system, and an electromechanical control electrically connected to the transducer for proportionately and systematically varying the braking action in the trailer brake system in accordance with the variation in the electrical signal, said control including a power booster having an unported diaphragm between two chambers defined within the power booster, a diaphragm interconnector interposed between the diaphragm and said trailer fluid brake system, valve means responsive to said electrical signal for altering pressure in one of the power booster chambers relative to the other chamber so as to move the diaphragm interconnector means and vary the fluid pressure in and resultant braking action of the trailer brake system in accordance with diaphram movement.

A brake system for a towing vehicle and trailer, comprising a towing vehicle fluid brake system, an electromechanical transducer connected to the towing vehicle fluid brake system for developing an electrical signal which varies proportionately in accordance with fluid pressure experienced in the towing vehicle brake system, a trailer fluid brake system, a power booster for energizing the trailer brake system, continuously energized fluid pressure supply means for creating a given absolute fluid pressure in the power booster, and an electromagnetic control electrically connected to the transducer and mechanically connected to the power booster for proportionately varying the fluid pressure and consequent braking action in the trailer brake system in accordance with the variation in the electrical signal.