Importance

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Abstract

A coupling device (10) is used in a brake system of a motor vehicle with handlebar steering and having a hand-operated valve, a foot-operated valve, a front-wheel brake device and a rear-wheel brake device. The coupling device has a housing, a port (30) for the hand-operated valve, a brake cylinder section (15) for the front wheel brake, a brake piston (22) which is arranged in the brake cylinder section (15), and a port (20) for the front-wheel brake. The coupling device (10) has a port (40) for the foot-operated valve and a coupling piston (42) which is arranged between the brake cylinder section (15) and the port (40) for the foot-operated valve. The effective area, which acts for a hydraulic transmission of force, of the coupling piston (42) is smaller on the side facing toward the brake cylinder section (15) than on the side facing toward the port (40) for the foot-operated valve. The coupling piston (42) is arranged in a differential cylinder. The coupling device (10) has a stop, which is fixed to the housing, for the brake piston (22) for a movement in the direction of the port (30) for the hand-operated valve. The coupling device (10) has a valve device for closing off the hydraulic connection between the coupling piston (42) and the foot-operated valve.

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First Claim