Abstract: A built-in wheel speed sensor structure having an internal gear-like sensor rotor integrally fixed to a tire and an electromagnetic car speed sensor fitted to an inner portion of a parking brake and facing the sensor rotor. The wheel speed sensor is supported by an anchor pin of the drum brake so that the sensor rotor may be positioned away from service holes for fastening bolts which have been bored into a brake drum.

Abstract: An anti creep braking system for a vehicle. A force transmission member is drivingly coupled to a part of the brake pedal and transmits braking force to a braking force generation system. A braked member is selectively braked by a braking device, and is driven by the brake pedal with a one direction force transmission device being interposed on the path of transmission of force between the brake pedal and the braked member. The sense of force transmission of the one direction force transmission device is such that, when the movement of the braked member with respect to the vehicle is prevented by the braking device, the brake pedal may be further depressed to increase vehicle braking action without transmitting substantial force to the braked member, but may not be moved backwards to reduce vehicle braking action.

Abstract: A device for controlling the hydraulic pressure in the hydraulic braking system of a vehicle, in such a manner that the hydraulic pressure in the rear wheel cylinder is increased at a rate smaller than that in the front wheel cylinder, after a predetermined level of deceleration of the vehicle is reached. The device has a valve chamber in which a ball valve is disposed movably. A differential piston has two opposing pressure receiving surfaces of different areas exposed in the inlet and outlet chambers. The arrangement is such that, when the predetermined level of deceleration is reached, the ball valve is moved due to its inertia to a position for interrupting the communication between the inlet and the outlet chambers. Once the communication between two chambers is interrupted, the pressure in the master cylinder is transmitted across the differential piston. The transmitted pressure is lowered at a rate corresponding to the ratio of the areas of pressure receiving surfaces of the differential piston.