Braking correction device

Abstract

A braking correction device has a stepped bore which is divided into an inlet chamber and an outlet chamber by a piston. A control valve is disposed in a passage of the piston and is normally open when the piston occupies a rest position. When the pressure in the inlet chamber rises, the control valve remains open until such pressure has reached a predetermined value, and fluid communication between the inlet and outlet chambers through said control valve is metered when the pressure in the inlet chamber increases above said predetermined value. The piston is urged towards its rest position under the influence of a return force delivered by a control member connected to the suspension of the vehicle, and abutting the piston at its outer end. The inlet and outlet chambers can also communicate by a passage defined between the outer periphery of the piston and the inner surface of the bore. An annular ring is disposed in said passage and acts as a non-return valve allowing fluid communication only from the outlet chamber towards the inlet chamber. At its outer end the piston also comprises a blind bore opening towards said control member. A light spring is disposed in said blind bore and has one end abutting the bottom of said blind bore and its other end abutting the control member. The spring permits to overcome the force resulting from the residual pressure in the outlet chamber to return the piston in its rest position, at the end of a brake decrease phase, even if the force transmitted from the control member is weak.