Abstract: An apparatus for simultaneously applying brakes of a trailer when brakes of a towing vehicle are applied is described. The apparatus includes a vacuum pump which communicates with a vacuum booster in a braking system of the trailer thereby providing vacuum pressure to the vacuum booster. A servomotor is linked to an activating arm that moves a plunger that acts through the vacuum booster upon a master brake cylinder of the trailer. Upon activation, the servomotor provides force to move the plunger thereby sending braking fluid from the master cylinder to brakes in the trailer. A pedal position sensor communicates with a brake pedal in the towing vehicle, whereby the brake pedal position of the towing vehicle is sensed. An encoder communicates with the pedal position sensor. The encoder receives data from the pedal position sensor regarding the brake pedal position of the towing vehicle and encodes such data. A decoder communicates with the encoder and the servomotor.

Abstract: An apparatus for simultaneously applying brakes of a towed vehicle having a self contained braking system when brakes of a towing vehicle are applied is described. This apparatus includes a vacuum pump linked with a vacuum booster in the braking system of the towed vehicle thereby providing vacuum pressure to the vacuum booster. A servomotor linked with a brake pedal in the braking system of the towed vehicle. Upon activation, the servomotor provides force to move the brake pedal thereby applying the brakes in the towed vehicle. A pedal position sensor is linked with the brake pedal in the towing vehicle, whereby the brake pedal position of the towing vehicle is sensed. An encoder is linked with the pedal position sensor. The encoder receives data from the pedal position sensor regarding the brake pedal position of the towing vehicle and encodes such data. A decoder is linked with the encoder and the servomotor.