SYSTEME DE FREINS HYDRAULIQUES POUR VEHICULE

INVENTION CONCERNANT LE FREINAGE DES VEHICULES.CIRCUIT DE FREINS POUR UN VEHICULE AYANT DES ROUES ARRIERE 1, 2 FREINABLES INDEPENDAMMENT, QUI COMPREND DES MAITRES-CYLINDRES SEPARES PAR DES PEDALES 10, 12. LES SORTIES DES MAITRES-CYLINDRES SONT RELIEES A UNE VANNE DE COMMANDE 16, ELLE-MEME RELIEE AUX FREINS DE ROUES AVANT. SI L'UNE SEULE DES PEDALES EST ENFONCEE, LA VANNE 16 ISOLE LES FREINS AVANT DU CIRCUIT HYDRAULIQUE; SI LES DEUX PEDALES, SOLIDARISEES PAR UNE PLAQUE 13, SONT ACTIONNEES, LA VANNE 16 AGIT POUR ASSURER LE FREINAGE SUR LES QUATRE ROUES.APPLICATION A LA REALISATION DE TELS SYSTEMES POUR TRACTEURS AGRICOLES. A brake circuit for a vehicle having selectively brakeable rear wheels comprises separate master cylinders each connected to one rear wheel brake and separately operable by means of foot pedals. The outputs of the master cylinders are connected to a control valve which in turn is connected to front wheel hydraulic brakes of the vehicle. When either of the pedals is depressed without depressing the other pedal the control valve is effective to isolate the front brakes from the pressurized rear brake circuit. However, when the brake pedals are linked together by a plate so that both rear brakes are operated together with control valve establishes a communication between the output of one master cylinder and the front brakes, thereby allowing four wheel braking.