Abstract: An electromagnetically actuatable pressure modulator for anti-locking brake systems utilizes a variable lever-type transmission interposed between a pressure relief piston of the modulator and the compression spring biased armature of an electromagnet whereby the non-linear force/air-gap relationship of the electromagnet is converted to a linear variation of the force applied to the pressure relief piston for moving same. When a predetermined maximum brake pressure is applied to the modulator, the latter automatically isolates the wheel cylinder from the master cylinder.

Abstract: A pressure modulator for anti-locking brake systems is provided with a pressure relief piston whose movement is controlled as a function of torque transmitted by an electromagnetic friction clutch.

Abstract: An anti-slipping system for preventing slippage between vehicle wheels drn by a differential is disclosed. The system includes first and second speed sensors for generating speed signals indicative of the rotational speed of first and second wheels of a vehicle, respectively, first and second braking control modules for adjusting the braking force applied to the first and second wheels as a function of first and second brake control signals, respectively, and a signal generating circuit for generating the first and second brake control signals as a function of the first and second speed signals.